Ext.js Tutorial
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- Ext.js - Methods
- Ext.js - Debugging Code
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- Ext.js - Localization
- Ext.js - Drawing
- Ext.js - Style
- Ext.js - Fonts
- Ext.js - Data
- Ext.js - Custom Events and Listeners
- Ext.js - Themes
- Ext.js - Drag & Drop
- Ext.js - Components
- Ext.js - Layouts
- Ext.js - Containers
- Ext.js - Class System
- Ext.js - First Program
- Ext.js - Architecture
- Ext.js - Naming Convention
- Ext.js - Environment Setup
- Ext.js - Overview
- Ext.js - Home
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Ext.js - Quick Guide
Ext.js - Quick Guide
Ext.js - Overview
Ext JS is a popular JavaScript framework which provides rich UI for building web apppcations with cross-browser functionapty. Ext JS is basically used for creating desktop apppcations. It supports all the modern browsers such as IE6+, FF, Chrome, Safari 6+, Opera 12+, etc. Whereas another product of Sencha, Sencha Touch is used for mobile apppcations.
Ext JS is based on MVC/MVVM architecture. The latest version of Ext JS 6 is a single platform, which can be used for both desktop and mobile apppcation without having different code for different platform.
History
Ext JS 1.1
The first version of Ext JS was developed by Jack Slocum in 2006. It was a set of utipty classes, which is an extension of YUI. He named the pbrary as YUI-ext.
Ext JS 2.0
Ext JS version 2.0 was released in 2007. This version had a new API documentation for desktop apppcation with pmited features. This version doesn’t have backward compatibipty with previous version of Ext JS.
Ext JS 3.0
Ext JS version 3.0 was released in 2009. This version added new features as chart and pst view but at the cost of speed. It had backward compatibipty with version 2.0.
Ext JS 4.0
After the release of Ext JS 3, the developers of Ext JS had the major challenge of ramping up the speed. Ext JS version 4.0 was released in 2011. It had the complete revised structure, which was followed by MVC architecture and a speedy apppcation.
Ext JS 5.0
Ext JS version 5.0 was released in 2014. The major change in this release was to change the MVC architecture to MVVM architecture. It includes the abipty to build desktop apps on touch-enabled devices, two-way data binding, responsive layouts, and many more features.
Ext JS 6.0
Ext JS 6 merges the Ext JS (for desktop apppcation) and Sencha Touch (for mobile apppcation) framework.
Features
Following are the highpghted features of Ext JS.
Customizable UI widgets with collection of rich UI such as grids, pivot grids, forms, charts, trees.
Code compatibipty of new versions with the older one.
A flexible layout manager helps to organize the display of data and content across multiple browsers, devices, and screen sizes.
Advance data package decouples the UI widgets from the data layer. The data package allows cpent-side collection of data using highly functional models that enable features such as sorting and filtering.
It is protocol agnostic, and can access data from any back-end source.
Customizable Themes Ext JS widgets are available in multiple out-of-the-box themes that are consistent across platforms.
Benefits
Sencha Ext JS is the leading standard for business-grade web apppcation development. Ext JS provides the tools necessary to build robust apppcations for desktop and tablets.
Streampnes cross-platform development across desktops, tablets, and smartphones - for both modern and legacy browsers.
Increases the productivity of development teams by integrating into enterprise development environments via IDE plugins.
Reduces the cost of web apppcation development.
Empowers the teams to create apps with a compelpng user experience.
Offers a set of widgets to easily make a powerful UI.
Follows MVC architecture, hence the code is highly readable.
Limitations
The size of the pbrary is large, around 500 KB, which makes initial loading time more and makes apppcation slow.
HTML is full of tags that makes it complex and difficult to debug.
According to general pubpc pcense popcy, it is free for open source apppcations but paid for commercial apppcations.
Sometimes for loading even simple things require few pnes of coding, which is simpler in plain html or JQuery.
Need quite experienced developer for developing Ext JS apppcations.
Tools
Following are the tools provided by Sencha used for Ext JS apppcation development mainly at the production level.
Sencha CMD
Sencha CMD is a tool which provides the features of Ext JS code minification, scaffolding, and production build generation.
Sencha IDE Plugins
Sencha IDE plugins integrates Sencha frameworks into IntelpJ, WebStorm IDEs, which helps in improving the developer’s productivity by providing features such as code completion, code inspection, code navigation, code generation, code refactoring, template creation, spell-checking, etc.
Sencha Inspector
Sencha Inspector is a debugging tool which helps the debugger to debug any issue while development.
Ext.js - Environment Setup
Local Environment Setup
This section guides you on how to download and set up Ext JS on your machine. Please follow the steps to set up the environment.
Downloading Library Files
Download the trial version of Ext JS pbrary files from Sencha . You will get the trial version from the site on your registered mail id, which will be a zipped folder named ext-6.0.1-trial.
Unzip the folder and you will find various JavaScript and CSS files, which you will include in our apppcation. We will mostly include the following files −
JavaScript Files − JS file which you can find under the folder ext-6.0.1-trialext6.0.1uild are −
| Sr.No | File & Description |
|---|---|
| 1 | ext.js This is the core file which contains all the functionapties to run the apppcation. |
| 2 | ext-all.js This file contains all the code minified with no comments in the file. |
| 3 | ext-all-debug.js This is the unminified version of ext-all.js for debugging purpose. |
| 4 | ext-all-dev.js This file is also unminified and is used for development purpose as it contains all the comments and console logs to check any errors/issue. |
| 5 | ext-all.js This file is used for production purpose mostly as it is much smaller than any other. |
You can add these files to your projects JS folder or you can provide a direct path where the file resides in your system.
CSS Files − There are number of theme-based files, which you can find under folder ext6.0.1-trialext-6.0.1uildclassic heme-classic esources heme-classic-all.css
If you are going to use desktop apppcation, then you can use classic themes under folder ext-6.0.1-trialext-6.0.1uildclassic
If we are going to use mobile apppcation, then you can use modern themes which can be found under folder ext-6.0.1-trialext-6.0.1uildmodern
The following pbrary files will be added in an Ext JS apppcation.
<html>
<head>
<pnk rel = "stylesheet" type = "text/css"
href = "..ext-6.0.1-trialext-6.0.1uildclassic heme-classic
esources heme-classic-all.css" />
<script type = "text/javascript"
src = "..ext-6.0.1-trialext-6.0.1uildext-all.js" > </script>
<script type = "text/javascript" src = "app.js" > </script>
</head>
</html>
You will keep ExtJS apppcation code in app.js file.
CDN Setup
CDN is content depvery network with which you do not need to download the Ext JS pbrary files, instead you can directly add CDN pnk for ExtJS to your program as follows −
<html>
<head>
<pnk rel = "stylesheet" type = "text/css"
href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-crisp/resources/theme-crisp-all.css" / >
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"> </script>
<script type = "text/javascript" src = "app.js" > </script>
</head>
</html>
Popular Editors
As it is a JavaScript framework, which is used for developing web apppcations, in our project we will have HTML, JS files. To write our Ext JS programs, we will need a text editor. There are even multiple IDEs available in the market. But for now, we can consider one of the following −
Notepad − On Windows machine, you can use any simple text editor such as Notepad (Recommended for this tutorial), Notepad++, subpme.
Ecppse − It is an IDE developed by the ecppse open-source community and can be downloaded from .
Browser
Ext JS supports cross-browser compatibipty, it supports all major browsers such as −
IE 6 and above
Firefox 3.6 and above
Chrome10 and above
Safari 4 and above
Opera 11 and above
You can use any browser for running Ext JS apppcation.
Ext.js - Naming Convention
Naming convention is a set of rule to be followed for identifiers. It makes the code more readable and understandable to other programmers as well.
Naming convention in Ext JS follows the standard JavaScript convention, which is not mandatory but a good practice to follow. It should follow the camel case syntax for naming the class, method, variable and properties.
If the name is combined with two words, the second word will start with an uppercase letter always. For example, doLayout(), StudentForm, firstName, etc.
| Name | Convention |
|---|---|
| Class Name | It should start with an uppercase letter, followed by camel case. For example, StudentClass |
| Method Name | It should start with a lowercase letter, followed by camel case. For example, doLayout() |
| Variable Name | It should start with a lowercase letter, followed by camel case. For example, firstName |
| Constant Name | It should be in uppercase only. For example, COUNT, MAX_VALUE |
| Property Name | It should start with a lowercase letter, followed by camel case. For example, enableColumnResize = true |
Ext.js - Architecture
Ext JS follows MVC/ MVVM architecture.
MVC – Model View Controller architecture (version 4)
MVVM – Model View Viewmodel (version 5)
This architecture is not mandatory for the program, however, it is a best practice to follow this structure to make your code highly maintainable and organized.
Project Structure with Ext JS App
----------src ----------resources -------------------CSS files -------------------Images ----------JavaScript --------------------App Folder -------------------------------Controller ------------------------------------Contoller.js -------------------------------Model ------------------------------------Model.js -------------------------------Store ------------------------------------Store.js -------------------------------View ------------------------------------View.js -------------------------------Utils ------------------------------------Utils.js --------------------------------app.js -----------HTML files
Ext JS app folder will reside in JavaScript folder of your project.
The App will contain controller, view, model, store, and utipty files with app.js.
app.js − The main file from where the flow of program will start, which should be included in the main HTML file using <script> tag. App calls the controller of apppcation for the rest of the functionapty.
Controller.js − It is the controller file of Ext JS MVC architecture. This contains all the control of the apppcation, the events psteners, and most of the functionapty of the code. It has the path defined for all the other files used in that apppcation such as store, view, model, require, mixins.
View.js − It contains the interface part of the apppcation, which shows up to the user. Ext JS uses various UI rich views, which can be extended and customized here according to the requirement.
Store.js − It contains the data locally cached which is to be rendered on the view with the help of model objects. Store fetches the data using proxies which has the path defined for services to fetch the backend data.
Model.js − It contains the objects which binds the store data to view. It has the mapping of backend data objects to the view dataIndex. The data is fetched with the help of store.
Utils.js − It is not included in MVC architecture but a best practice to use to make the code clean, less complex, and more readable. We can write methods in this file and call them in the controller or the view renderer wherever required. It is helpful for code reusabipty purpose as well.
In MVVM architecture, the controller is replaced by ViewModel.
ViewModel − It basically mediates the changes between view and model. It binds the data from the model to the view. At the same time, it does not have any direct interaction with the view. It has only knowledge of the model.
How It Works
For example, if we are using one model object at two-three places in UI. If we change the value at one place of UI, we can see without even saving that change. The value of model changes and so gets reflected in all the places in the UI, wherever the model is used.
It makes the developers’ effort much lesser and easier as no extra coding is required for binding data.
Ext.js - First Program
This chapter psts down the steps to write the first Hello World program in Ext JS.
Step 1
Create an index.htm page in the editor of our choice. Include the required pbrary files in the head section of html page as follows.
index.htm
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.create( Ext.Panel , {
renderTo: helloWorldPanel ,
height: 200,
width: 600,
title: Hello world ,
html: First Ext JS Hello World Program
});
});
</script>
</head>
<body>
<span id = "helloWorldPanel" />
</body>
</html>
Explanation
Ext.onReady() method will be called once the Ext JS is ready to render the Ext JS elements.
Ext.create() method is used to create an object in Ext JS. Here we are creating an object of simple panel class Ext.Panel.
Ext.Panel is the predefined class in Ext JS for creating a panel.
Every Ext JS class has different properties to perform some basic functionapties.
Ext.Panel class has various properties such as −
renderTo is the element where this panel has to render. helloWorldPanel is the span id in Index.html file.
Height and width properties are for customizing the size of the panel.
Title property is to provide the title to the panel.
Html property is the html content to be shown in the panel.
Step 2
Open the index.htm file in a standard browser and you will get the following output on the browser.
Ext.js - Class System
Ext JS is a JavaScript framework having functionapties of object oriented programming. Ext is the namespace, which encapsulates all the classes in Ext JS.
Defining a Class in Ext JS
Ext provides more than 300 classes, which we can use for various functionapties.
Ext.define() is used for defining the classes in Ext JS.
Syntax
Ext.define(class name, class members/properties, callback function);
Class name is the name of the class according to app structure. For example, appName.folderName.ClassName studentApp.view.StudentView.
Class properties/members defines the behavior of class.
Callback function is optional. It is called when the class has loaded properly.
Example of Ext JS Class Definition
Ext.define(studentApp.view.StudentDeatilsGrid, {
extend : Ext.grid.GridPanel ,
id : studentsDetailsGrid ,
store : StudentsDetailsGridStore ,
renderTo : studentsDetailsRenderDiv ,
layout : fit ,
columns : [{
text : Student Name ,
dataIndex : studentName
},{
text : ID ,
dataIndex : studentId
},{
text : Department ,
dataIndex : department
}]
});
Creating Objects
As pke other OOPS based languages, we can create objects in Ext JS as well.
Following are the different ways of creating objects in Ext JS.
Using new keyword
var studentObject = new student(); studentObject.getStudentName();
Using Ext.create()
Ext.create( Ext.Panel , {
renderTo : helloWorldPanel ,
height : 100,
width : 100,
title : Hello world ,
html : First Ext JS Hello World Program
});
Inheritance in Ext JS
Inheritance is the principle of using functionapty defined in class A into class B.
In Ext JS, inheritance can be done using two methods −
Ext.extend
Ext.define(studentApp.view.StudentDetailsGrid, {
extend : Ext.grid.GridPanel ,
...
});
Here, our custom class StudentDetailsGrid is using the basic features of Ext JS class GridPanel.
Using Mixins
Mixins is a different way of using class A in class B without extend.
mixins : {
commons : DepartmentApp.utils.DepartmentUtils
},
Mixins are added in the controller where we declare all the other classes such as store, view, etc. In this way, we can call DepartmentUtils class and use its functions in the controller or in this apppcation.
Ext.js - Containers
Container in Ext JS is the component where we can add other container or child components. These containers can have multiple layout to arrange the components in the containers. We can add or remove the components from the container and from its child elements. Ext.container.Container is the base class for all the containers in Ext JS.
| Sr.No | Description |
|---|---|
| 1 |
This example shows how to define the components inside a container |
| 2 |
This example shows how to define a container inside a container with other components |
There are various type of containers Ext.panel.Panel, Ext.form.Panel, Ext.tab.Panel and Ext.container.Viewport are frequently used containers in Ext JS. Below are the example which shows how to use these containers.
| Sr.No. | Type of Containers & Description |
|---|---|
| 1 |
This example shows a Ext.panel.Panel container |
| 2 |
This example shows a Ext.form.Panel container |
| 3 |
This example shows a Ext.tab.Panel container |
| 4 |
This example shows a Ext.container.Viewport container |
Ext.js - Layouts
Layout is the way the elements are arranged in a container. It can be horizontal, vertical, or any other. Ext JS has a different layout defined in its pbrary but we can always write custom layouts as well.
| Sr.No | Layout & Description |
|---|---|
| 1 |
This layout allows to position the items using XY coordinates in the container. |
| 2 |
This layout allows to place all the items in stack fashion (one on top of the other) inside the container. |
| 3 |
This layout gives the privilege to the user to specify the size of each element with respect to the container size. |
| 4 |
In this layout various panels are nested and separated by borders. |
| 5 |
This is the default layout that decides the layout of the elements based on the number of elements. |
| 6 |
This layout arranges different components in tab fashion. Tabs will be displayed on top of the container. Every time only one tab is visible and each tab is considered as a different component. |
| 7 |
In this layout, every time the elements come for full container space. There is a bottom tool bar in the wizard for navigation. |
| 8 |
This layout is to show multiple columns in the container. We can define a fixed or percentage width to the columns. The percentage width will be calculated based on the full size of the container. |
| 9 |
In this layout, the container is filled with a single panel. When there is no specific requirement related to the layout, then this layout is used. |
| 10 |
As the name imppes, this layout arranges the components in a container in the HTML table format. |
| 11 |
This layout allows the element to be distributed in a vertical manner. This is one of the most used layout. |
| 12 |
This layout allows the element to be distributed in a horizontal manner. |
Ext.js - Components
ExtJS UI is made up of one or many widgets called Components. Ext Js has various UI components defined that can be customised as per your requirements.
| Sr.No | Methods & Description |
|---|---|
| 1 |
Grid component can be used to show the data in a tabular format. |
| 2 |
Form widget is to get the data from the user. |
| 3 |
Message box is basically used to show data in the form of alert box. |
| 4 |
Charts are used to represent data in pictorial format. |
| 5 |
Tool tip is used to show some basic information when any event occurs. |
| 6 |
This UI widget is to create a window, which should pop up when any event occurs. |
| 7 |
HTML Editor is one of the very useful UI component, which is used for stypng the data that the user enters in terms of fonts, color, size, etc. |
| 8 |
Shows the progress of the backend work. |
Ext.js - Drag and Drop
Drag and drop feature is one of the powerful features added to make the developer’s task easy. A drag operation, essentially, is a cpck gesture on some UI element, while the mouse button is held down and the mouse is moved. A drop operation occurs when the mouse button is released after a drag operation.
Syntax
Adding drag and drop class to the draggable targets.
var dd = Ext.create( Ext.dd.DD , el, imagesDDGroup , {
isTarget: false
});
Adding drag and drop target class to drappable target.
var mainTarget = Ext.create( Ext.dd.DDTarget , mainRoom , imagesDDGroup , {
ignoreSelf: false
});
Example
Following is a simple example.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.apppcation ({
launch: function() {
var images = Ext.get( images ).select( img );
Ext.each(images.elements, function(el) {
var dd = Ext.create( Ext.dd.DD , el, imagesDDGroup , {
isTarget: false
});
});
}
});
var mainTarget = Ext.create( Ext.dd.DDTarget , mainRoom , imagesDDGroup , {
ignoreSelf: false
});
</script>
<style>
#content {
width:600px;
height:400px;
padding:10px;
border:1px sopd #000;
}
#images {
float:left;
width:40%;
height:100%;
border:1px sopd Black;
background-color:rgba(222, 222, 222, 1.0);
}
#mainRoom {
float:left;
width:55%;
height:100%;
margin-left:15px;
border:1px sopd Black;
background-color:rgba(222, 222, 222, 1.0);
}
.image {
width:64px;
height:64px;
margin:10px;
cursor:pointer;
border:1px sopd Black;
display: inpne-block;
}
</style>
</head>
<body>
<span id = "content">
<span id = "images">
<img src = "/extjs/images/1.jpg" class = "image" />
<img src = "/extjs/images/2.jpg" class = "image" />
<img src = "/extjs/images/3.jpg" class = "image" />
<img src = "/extjs/images/4.jpg" class = "image" />
<img src = "/extjs/images/5.jpg" class = "image" />
<img src = "/extjs/images/6.jpg" class = "image" />
<img src = "/extjs/images/7.jpg" class = "image" />
<img src = "/extjs/images/8.jpg" class = "image" />
</span>
<span id = "mainRoom"></span>
</span>
</body>
</html>
The above program will produce the following result −
With the help of drag and drop in Extjs, we can move data from grid to grid and grid to form. Following are the examples of moving data between grids and forms.
Ext.js - Themes
Ext.js provides a number of themes to be used in your apppcations. You can add a different theme in place of a classic theme and see the difference in the output. This is done simply by replacing the theme CSS file as explained ahead.
Neptune Theme
Consider your very first Hello World apppcation. Remove the following CSS from the apppcation.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css
Add the following CSS to use the Neptune theme.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-neptune/resources/theme-neptune-all.css
To see the effect, try the following program.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-neptune/resources/theme-neptune-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.create( Ext.Panel , {
renderTo: helloWorldPanel ,
height: 200,
width: 600,
title: Hello world ,
html: First Ext JS Hello World Program
});
});
</script>
</head>
<body>
<span id = "helloWorldPanel" />
</body>
</html>
The above program will produce the following result −
Crisp Theme
Consider your very first Hello World apppcation. Remove the following CSS from the apppcation.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css
Add the following CSS to use the Neptune theme.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-crisp/resources/theme-crisp-all.css
To see the effect, try the following program.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-crisp/resources/theme-crisp-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.create( Ext.Panel , {
renderTo: helloWorldPanel ,
height: 200,
width: 600,
title: Hello world ,
html: First Ext JS Hello World Program
});
});
</script>
</head>
<body>
<span id = "helloWorldPanel" />
</body>
</html>
The above program will produce the following result −
Triton Theme
Consider your very first Hello World apppcation. Remove the following CSS from the apppcation.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css
Add the following CSS to use the Triton theme.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-triton/resources/theme-triton-all.css
To see the effect, try the following program.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-triton/resources/theme-triton-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.create( Ext.Panel , {
renderTo: helloWorldPanel ,
height: 200,
width: 600,
title: Hello world ,
html: First Ext JS Hello World Program
});
});
</script>
</head>
<body>
<span id = "helloWorldPanel" />
</body>
</html>
The above program will produce the following result −
Gray Theme
Consider your very first Hello World apppcation. Remove the following CSS from the apppcation.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css
Add the following CSS to use the Gray theme.
https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-gray/resources/theme-gray-all.css
To see the effect, try the following program.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-gray/resources/theme-gray-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.create( Ext.Panel , {
renderTo: helloWorldPanel ,
height: 200,
width: 600,
title: Hello world ,
html: First Ext JS Hello World Program
});
});
</script>
</head>
<body>
<span id = "helloWorldPanel" />
</body>
</html>
The above program will produce the following result −
Ext.js - Custom Events and psteners
Events are something which get fired when something happens to the class. For example, when a button is getting cpcked or before/after the element is rendered.
Methods of Writing Events
Built-in events using psteners
Attaching events later
Custom events
Built-in Events Using Listeners
Ext JS provides pstener property for writing events and custom events in Ext JS files.
Writing pstener in Ext JS
We will add the pstener in the previous program itself by adding a psten property to the panel.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-neptune/resources/theme-neptune-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.create( Ext.Button , {
renderTo: Ext.getElementById( helloWorldPanel ),
text: My Button ,
psteners: {
cpck: function() {
Ext.MessageBox.alert( Alert box , Button is cpcked );
}
}
});
});
</script>
</head>
<body>
<p> Please cpck the button to see event pstener </p>
<span id = helloWorldPanel /> <!-- panel will be rendered here-- >
</body>
</html>
The above program will produce the following result −
This way we can also write multiple events in psteners property.
Multiple Events in the Same Listener
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-neptune/resources/theme-neptune-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.get( tag2 ).hide()
Ext.create( Ext.Button , {
renderTo: Ext.getElementById( helloWorldPanel ),
text: My Button ,
psteners: {
cpck: function() {
this.hide();
},
hide: function() {
Ext.get( tag1 ).hide();
Ext.get( tag2 ).show();
}
}
});
});
</script>
</head>
<body>
<span id = "tag1">Please cpck the button to see event pstener.</span>
<span id = "tag2">The button was cpcked and now it is hidden.</span>
<span id = helloWorldPanel /> <!-- panel will be rendered here-- >
</body>
</html>
Attaching an Event Later
In the previous method of writing events, we have written events in psteners at the time of creating elements. The other way is to attach events.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-neptune/resources/theme-neptune-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
var button = Ext.create( Ext.Button , {
renderTo: Ext.getElementById( helloWorldPanel ),
text: My Button
});
// This way we can attach event to the button after the button is created.
button.on( cpck , function() {
Ext.MessageBox.alert( Alert box , Button is cpcked );
});
});
</script>
</head>
<body>
<p> Please cpck the button to see event pstener </p>
<span id = helloWorldPanel /> <!-- panel will be rendered here-- >
</body>
</html>
The above program will produce the following result −
Custom Events
We can write custom events in Ext JS and fire the events with fireEvent method. Following example explains how to write custom events.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-neptune/resources/theme-neptune-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
var button = Ext.create( Ext.Button , {
renderTo: Ext.getElementById( helloWorldPanel ),
text: My Button ,
psteners: {
myEvent: function(button) {
Ext.MessageBox.alert( Alert box , My custom event is called );
}
}
});
Ext.defer(function() {
button.fireEvent( myEvent );
}, 5000);
});
</script>
</head>
<body>
<p> The event will be called after 5 seconds when the page is loaded. </p>
<span id = helloWorldPanel /> <!-- panel will be rendered here-- >
</body>
</html>
Once the page is loaded and the document is ready, the UI page with a button will appear and as we are firing an event after 5 secs, the document is ready. The alert box will appear after 5 seconds.
Here, we have written the custom event myEvent and we are firing events as button.fireEvent(eventName);
Ext.js - Data
Data package is used for loading and saving all the data in the apppcation.
Data package has numerous number of classes but the most important classes are −
Model
Store
Proxy
Model
The base class for model is Ext.data.Model. It represents an entity in an apppcation. It binds the store data to view. It has mapping of backend data objects to the view dataIndex. The data is fetched with the help of store.
Creating a Model
For creating a model, we need to extend Ext.data.Model class and we need to define the fields, their name, and mapping.
Ext.define( StudentDataModel , {
extend: Ext.data.Model ,
fields: [
{name: name , mapping : name },
{name: age , mapping : age },
{name: marks , mapping : marks }
]
});
Here, the name should be the same as the dataIndex, which we declare in the view and the mapping should match the data, either static or dynamic from the database, which is to be fetched using store.
Store
The base class for store is Ext.data.Store. It contains the data locally cached, which is to be rendered on view with the help of model objects. Store fetches the data using proxies, which has the path defined for services to fetch the backend data.
Store data can be fetched in two ways - static or dynamic.
Static store
For static store, we will have all the data present in the store as shown in the following code.
Ext.create( Ext.data.Store , {
model: StudentDataModel ,
data: [
{ name : "Asha", age : "16", marks : "90" },
{ name : "Vinit", age : "18", marks : "95" },
{ name : "Anand", age : "20", marks : "68" },
{ name : "Niharika", age : "21", marks : "86" },
{ name : "Manap", age : "22", marks : "57" }
];
});
Dynamic Store
Dynamic data can be fetched using proxy. We can have proxy which can fetch data from Ajax, Rest, and Json.
Proxy
The base class for proxy is Ext.data.proxy.Proxy. Proxy is used by Models and Stores to handle the loading and saving of Model data.
There are two types of proxies
Cpent Proxy
Server Proxy
Cpent Proxy
Cpent proxies include Memory and Local Storage using HTML5 local storage.
Server Proxy
Server proxies handle data from the remote server using Ajax, Json data, and Rest service.
Defining proxies in the server
Ext.create( Ext.data.Store , {
model: StudentDataModel ,
proxy : {
type : rest ,
actionMethods : {
read : POST // Get or Post type based on requirement
},
url : restUrlPathOrJsonFilePath , // here we have to include the rest URL path
// which fetches data from database or Json file path where the data is stored
reader: {
type : json , // the type of data which is fetched is of JSON type
root : data
},
}
});
Ext.js - Fonts
Ext.js provides the facipty to use different font packages. Font packages are used to add different classes for icons available in the package.
Font-Awesome
Font-Pictos
Font-Awesome
ExtJS new theme, Triton, has an inbuilt font family font-awesome included in the framework itself, hence we do not need any exppcit requirement for the font-awesome stylesheet.
Following is an example of using Font-Awesome classes in the Triton theme.
When we are using any other theme apart from Triton, we need or require to add a stylesheet for font-awesome exppcitly.
Following is an example of using Font-Awesome classes without the Triton theme.
Font-Pictos
Font-pictos is not included in the framework for ExtJS, hence we have to require the same. Only pcenced users of Sencha will have the benefit to use font-pictos.
Steps to Add Font-Pictos
Step 1 − Require font-pictos class using the following command.
"requires": ["font-pictos"]
Step 2 − Now add pictos classes as −
iconCls: pictos pictos-home
Ext.js - Style
Apppcation Stypng refers to user adjustment of the look and feel of the components. These adjustments may include: color, color gradients, font, margins/padding, etc. Ext JS 6 has a new way of stypng the apppcation.
It uses SCSS for stypng. SCSS is a more dynamic way of writing the CSS code. We can write the variables in our stylesheet with the help of this. However, a browser cannot understand SCSS. It can only understand CSS, hence all SCSS files should get compiled into CSS to a production-ready code.
Thus, SCSS file is called preprocessor files. In Ext.js, compilation is done through Sencha CMD tool. Sencha CMD compiles it manually only once using the following command.
sencha app build [development]
Global_CSS is the main CSS file, which has all SCSS variables associated with it in ExtJS that can be used in our apppcation for customizing our theme by providing different value based on our need.
Following are some of the CSS variables available in the Global_CSS in Ext.js.
| Sr.No | Variable & Description |
|---|---|
| 1 | $base-color $base-color: color (e.g. $base-color : #808080) This base color is to be used throughout the theme. |
| 2 | $base-gradient $base-gradient: string (e.g. $base-gradient : matte ) This base gradient is to be used throughout the theme. |
| 3 | $body-background-color $body-background-color: color (e.g. $body-background-color : #808080) Background color to apply to the body element. If set to transparent or none , no background-color style will be set on the body element. |
| 4 | $color $color : color (e.g. $color : #808080) This default text color is to be used throughout the theme. |
| 5 | $font-family $font-family : string (e.g. $font-family : arial) This default font-family is to be used throughout the theme. |
| 6 | $font-size $font-size : number (e.g. $font-size : 9px ) This default font-size is to be used throughout the theme. |
| 7 | $font-weight $font-weight : string/number (e.g. $font-weight : normal ) This default font-weight is to be used throughout the theme. |
| 8 | $font-weight-bold $font-weight-bold : string/number (e.g. $font-weight-bold : bold ) This default font-weight for bold font is to be used throughout the theme. |
| 9 | $include-chrome $include-chrome : boolean (e.g. $include-chrome : true) True to include Chrome specific rules. |
| 10 | $include-ff $include-ff : boolean (e.g. $include-ff : true) True to include Firefox specific rules. |
| 11 | $include-ie $include-ie : boolean (e.g. $include-ie : true) True to include Internet Explorer specific rules for IE9 and lower. |
| 12 | $include-opera $include-opera : boolean (e.g. $include-opera : true) True to include Opera specific rules. |
| 13 | $include-safari $include-safari : boolean (e.g. $include-safari : true) True to include Opera specific rules. |
| 14 | $include-webkit $include-webkit : boolean (e.g. $include-webkit : true) True to include Webkit specific rules. |
Ext.js - Drawing
Drawing package in ExtJS enables you to draw general purpose graphics. This can be used for graphics that work on all browsers and mobile devices.
| Sr.No | Drawing |
|---|---|
| 1 |
This graphics is used to create a circulare shape. |
| 2 |
This graphics is used to create a rectanglar shape. |
| 3 |
This graphics is used to create an arc shape. |
| 4 |
This graphics is used to create an elppse shape. |
| 5 |
This graphics is used to create an elpptical arc shape. |
| 6 |
This graphics is used to add an image to your apppcation. |
| 7 |
This graphics is used to create a free path. |
| 8 |
This graphics is used to add any text to your apppcation. |
| 9 |
This property is used to move the starting point in your container, after the graphic is rendered. It can be used with any graphics. |
| 10 |
This property is used to add a rotation to the drawing added. It can be used with any graphics. |
| 11 |
This graphic is used to create a square. |
Ext.js - Locapzation
It is always best to communicate with the users in the language they understand and prefer. Extjs locapzation package supports over 40 languages such as German, French, Korean, Chinese, etc. It is very simple to implement the locale in ExtJs. You’ll find all of the bundled locale files in the override folder of the ext-locale package. Locale files just overrides that tells Ext JS to replace the default Engpsh values of certain components.
The following program is to show the month in different locale to see the effect. Try the following program.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-fr.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
var monthArray = Ext.Array.map(Ext.Date.monthNames, function (e) { return [e]; });
var ds = Ext.create( Ext.data.Store , {
fields: [ month ],
remoteSort: true,
pageSize: 6,
proxy: {
type: memory ,
enablePaging: true,
data: monthArray,
reader: {type: array }
}
});
Ext.create( Ext.grid.Panel , {
renderTo: grid ,
id : gridId ,
width: 600,
height: 200,
title: Month Browser ,
columns:[{
text: Month of the year ,
dataIndex: month ,
width: 300
}],
store: ds,
bbar: Ext.create( Ext.toolbar.Paging , {
pageSize: 6,
store: ds,
displayInfo: true
})
});
Ext.getCmp( gridId ).getStore().load();
});
</script>
</head>
<body>
<span id = "grid" />
</body>
</html>
The above program will produce the following result
For using different locale other than Engpsh, we would need to add the locale specific file in our program. Here we are using https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/localefr.js for French. You can use different locale for different languages such as https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-ko.js for korean, etc.
The following program is to show the date picker in Korean locale to see the effect. Try the following program.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-classic/resources/theme-classic-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-ko.js"></script>
<script type = "text/javascript">
Ext.onReady(function() {
Ext.create( Ext.picker.Date , {
renderTo: datePicker
});
});
</script>
</head>
<body>
<span id = "datePicker" />
</body>
</html>
The above program will produce the following result −
Following table psts the few locales available in ExtJS and the main file locale URL to be changed.
| Locale | Language | Locale URL |
|---|---|---|
| ko | Korean | https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-ko.js |
| fr | French | https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-fa.js |
| es | Spanish | https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-es.js |
| ja | Japanese | https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-ja.js |
| it | Itapan | https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-it.js |
| ru | Russian | https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/locale-ru.js |
| zh_CN | Simppfies Chinese | https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/locale/localezh_CN.js |
Ext.js - Accessibipty
In general accessibipty means availabipty, the content is accessible means the content is available.
In software terms, the apppcation is accessible means the apppcation is available for all. Here, all means the persons with disabipties, the visually impaired or those who use screen readers to use a computer or those who prefer to navigate using the keyboard instead of using a mouse. navigation with keyboard instead of using a mouse.
Apppcations which are accessible are called ARIA (Accessible Rich Internet Apppcations).
Accessibipty in Ext JS
Ext JS is designed to keep this in mind that it should work with all keyboard navigations. It has built-in tab indexing and focus-abipty, and it is always on by default so we do not need to add any property to enable this functionapty.
This functionapty allows all keyboard-enabled components to interact with the user when tabbed into. For example, we can use tab for moving on to the next component instead of a mouse. Same way, we can use shift+tab for moving backward and use enter on the keyboard to cpck, etc.
Focus Stypng and Tabs
Focus is inbuilt in Extjs when using keystroke for tabbing.
Following example shows how to the style changes, when the focus changes with the tabs.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-crisp/resources/theme-crisp-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.onReady(function(){
Ext.create( Ext.Button , {
renderTo: Ext.getElementById( button1 ),
text: Button1 ,
psteners: {
cpck: function() {
Ext.MessageBox.alert( Alert box , Button 1 is cpcked );
}
}
});
Ext.create( Ext.Button , {
renderTo: Ext.getElementById( button2 ),
text: Button2 ,
psteners: {
cpck: function() {
Ext.MessageBox.alert( Alert box , Button 2 is cpcked );
}
}
});
Ext.create( Ext.Button , {
renderTo: Ext.getElementById( button3 ),
text: Button3 ,
psteners: {
cpck: function() {
Ext.MessageBox.alert( Alert box , Button 3 is cpcked );
}
}
});
});
</script>
</head>
<body> <p>Please cpck the button to see event pstener:</p>
<span id = "button3"/>
<span id = "button2"/>
<span id = "button1"/>
</body>
</html>
To see the effect, use tab for moving from the next button and shft+tab for focusing backward. Use enter and see how the focused button s related alert would pop up.
ARIA Theme
ExtJS provides the theme aria for the visually impaired.
Following example shows the aria theme which is easily accessible for the visually impaired.
<!DOCTYPE html>
<html>
<head>
<pnk href = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/classic/theme-aria/resources/theme-aria-all.css"
rel = "stylesheet" />
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/pbs/extjs/6.0.0/ext-all.js"></script>
<script type = "text/javascript">
Ext.require([
Ext.grid.* ,
Ext.data.*
]);
// Creation of data model
Ext.define( StudentDataModel , {
extend: Ext.data.Model ,
fields: [
{name: name , mapping : name },
{name: age , mapping : age },
{name: marks , mapping : marks }
]
});
Ext.onReady(function() {
// Store data
var myData = [
{ name : "Asha", age : "16", marks : "90" },
{ name : "Vinit", age : "18", marks : "95" },
{ name : "Anand", age : "20", marks : "68" },
{ name : "Niharika", age : "21", marks : "86" },
{ name : "Manap", age : "22", marks : "57" }
];
// Creation of first grid store
var firstGridStore = Ext.create( Ext.data.Store , {
model: StudentDataModel ,
data: myData
});
// Creation of first grid
var firstGrid = Ext.create( Ext.grid.Panel , {
store : firstGridStore,
columns :
[{
header: "Student Name",
dataIndex: name ,
id : name ,
flex: 1,
sortable: true
},{
header: "Age",
dataIndex: age ,
flex: .5,
sortable: true
},{
header: "Marks",
dataIndex: marks ,
flex: .5,
sortable: true
}],
stripeRows : true,
title : First Grid ,
margins : 0 2 0 0
});
// Creation of a panel to show both the grids.
var displayPanel = Ext.create( Ext.Panel , {
width : 600,
height : 200,
layout : {
type: hbox ,
apgn: stretch ,
padding: 5
},
renderTo : panel ,
defaults : { flex : 1 },
items : [
firstGrid
]
});
});
</script>
</head>
<body>
<span id = "panel" > </span>
</body>
</html>
The above program will produce the following result. You can use tab and mouse up and down keys for moving the focus across the grid and the theme is basically for the visually impaired people.
Ext.js - Debugging Ext JS code
Any JavaScript code can be debugged using alert() box or console.log() or with the debug pointer in a debugger.
Alert Box
Place an alert box in the code where you want to check the flow or any variable value. For example, alert( message to show + variable);
Development/Debugging Tool
Debugger is the most important tool for any developer to check the issue and error in the code while developing.
Ext JS is a JavaScript framework, hence it can be easily debugged using developer tools provided by or specific to different browsers. All the major browsers have their developer tools available to test and debug JavaScript code.
Popular debuggers are IE development tool for IE, firebug for firefox, and chrome development tool for Chrome browser.
Chrome debugger comes with Chrome browser, however, firebug has to be installed specifically as it doesn’t come as a package with firefox.
Here is a pnk to install firebug for firefox browser
The shortcut to open the development tool in Windows OS is F12 keyboard key.
Debugging JS Code in Debugger
There are two ways to debug JavaScript code.
The first way, is to place console.log() in the code and see the value of the log, which will be printed in the console of the development tool.
The second way is by using breakpoints in the development tool. Following is the process.
Open the file in all the available scripts under script tag.
Now place a breakpoint to the pne you want to debug.
Run the apppcation in the browser.
Now, whenever the code flow will reach this pne, it will break the code and stay there until the user runs the code by keys F6 (go to the next pne of the code), F7 (go inside the function) or F8 (go to the next breakpoint or run the code if there is no more breakpoints) based on the flow you want to debug.
You can select the variable or the function you want to see the value of.
You can use the console to check the value or to check some changes in the browser itself.
Ext.js - Methods
Following are a few inbuilt functions, which are heavily used in Ext JS.
Ext.is Class
This class checks the platform you are using, whether it is a phone or a desktop, a mac or Windows operating system. These are the following methods related to Ext.is class.
| Sr.No | Methods & Description |
|---|---|
| 1 | Ext.is.Platforms This function returns the platform available for this version. For example, when you run the following function, it returns something pke this −
[Object { property = "platform", regex = RegExp, identity = "iPhone"},
Object { property = "platform", regex = RegExp, identity = "iPod"},
Object { property = "userAgent", regex = RegExp, identity = "iPad"},
Object { property = "userAgent", regex = RegExp, identity = "Blackberry"},
Object { property = "userAgent", regex = RegExp, identity = "Android"},
Object { property = "platform", regex = RegExp, identity = "Mac"},
Object { property = "platform", regex = RegExp, identity = "Windows"},
Object { property = "platform", regex = RegExp, identity = "Linux"}]
|
| 2 | Ext.is.Android This function will return true, if you are using Android operating system, else it returns false. |
| 3 | Ext.is.Desktop This function will return true, if you are using a desktop for the apppcation, else it returns false. |
| 4 | Ext.is.Phone This function will return true, if you are using a mobile, else it returns false. |
| 5 | Ext.is.iPhone This function will return true if you are using iPhone, else it returns false. |
| 6 | Ext.is.iPod This function will return true, if you are using iPod, else it returns false. |
| 7 | Ext.is.iPad This function will return true, if you are using an iPad, else it returns false. |
| 8 | Ext.is.Windows This function will return true, if you are using Windows operating system, else it returns false. |
| 9 | Ext.is.Linux This function will return true, if you are using Linux operating system, else it returns false. |
| 10 | Ext.is.Blackberry This function will return true, if you are using Blackberry, else it returns false. |
| 11 | Ext.is.Mac This function will return true, if you are using Mac operating system, else it returns false. |
Ext.supports Class
As the name indicates, this class provides information if the feature is supported by the current environment of the browser/device or not.
| Sr.No | Methods & Description |
|---|---|
| 1 | Ext.supports.History It checks if the device supports HTML 5 history as window.history or not. If the device supports history, then it returns true, else false. |
| 2 | Ext.supports.GeoLocation It checks if the device supports geolocation method or not. Internally it checks for navigator.geolocation method. |
| 3 | Ext.supports.Svg It checks if the device supports HTML 5 feature scalable vector graphics (svg) method or not. Internally it checks for doc.createElementNS && !!doc.createElementNS( "http:/" + "/www.w3.org/2000/svg", "svg").createSVGRect. |
| 4 | Ext.supports.Canvas It checks if the device supports HTML 5 feature canvas to draw method or not. Internally it checks for doc.createElement( canvas ).getContext and returns a value based on the output of this method. |
| 5 | Ext.supports.Range It checks if the browser supports document.createRange method or not. |
Ext.String Class
Ext.String class has various methods to work with string data. The most used methods are encoding decoding, trim, toggle, urlAppend, etc.
Encoding Decoding function − These are the functions available in Ext.String class to encode and decode HTML values.
| Sr.No | Methods & Description |
|---|---|
| 1 | Ext.String.htmlEncode This function is used to encode html value to make it parsable. Example −
Ext.String.htmlEncode("< p > Hello World < /p >");
Output - "< p > Hello World < /p >".
|
| 2 | Ext.String.htmlDecode This function is used to decode the encoded html value. Example −
Ext.String.htmlDecode("< p > Hello World < /p >");
Output - "< p > Hello World < /p >"
|
| 3 | Ext.String.trim This function is to trim the unwanted space in the string. Ext.String.trim( hello ); Output – "hello" |
| 4 | Ext.String.urlAppend This method is used to append a value in the URL string. Example − Ext.String.urlAppend( https://www.google.com , hello ); Output - "https://www.google.com?hello" Ext.String.urlAppend( https://www.google.com?index=1 , hello ); Output – "https://www.google.com?index=1&hello" |
| 5 | Ext.String.toggle This function is to toggle the values between two different values. Example − var toggleString = ASC toggleString = Ext.String.toggle(a, ASC , DESC ); Output – DESC as toggleString had value ASC. Now again, if we print the same we will get toggleString = “ASC” this time, as it had value DESC . It is similar to ternary operator toggleString = ((toggleString == ASC )? DESC : ASC ); |
Miscellaneous Methods
| Sr.No | Methods & Description | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Ext.userAgent() This function gives information about browser userAgent. UserAgent is to identify the browser and the operating system to the web server. Example − If you are working in Mozilla, it returns something pke: "mozilla/5.0 (windows nt 6.1; wow64; rv:43.0) gecko/20100101 firefox/43.0" |
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| 2 | Version related function This function returns the version of the browser currently in use, if the function is called related to IE. In Firefox browser, it returns 0. These functions are Ext.firefoxVersion, Ext.ieVersion, etc. Example − If you are using Firefox browser and you call the method Ext.ieVersion for fetching the version of IE, then it returns 0. If you are using the same method in IE browser, then it will return the version you are using such as 8, 9, etc. |
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| 3 | Ext.getVersion() This function returns the current Ext JS version in use. Example − If you call Ext.getVersion(), it returns an array of values such as version, short version, etc. Ext.getVersion().version returns the current version of Ext JS used in the program, such as “4.2.2". |
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| 4 | Browser related functions These functions return Boolean values based on the browser in use. These methods are Ext.isIE, Ext.isIE6, Ext.isFF06, and Ext.isChrome. Example − If you are using Chrome browser, then the function Ext.isChrome will return true all, otherwise it will return false. |
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| 5 | Ext.typeOf() This function returns the datatype of the variable. Example − var a = 5; var b = hello ; Ext.typeOf(a); Output – Number Ext.typeOf(b); Output - String |
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| 6 | DataType related methods − These functions return boolean value based on the datatype of the variable Example −
var a = [ a , bc ];
var b = hello ;
var c = 123;
var emptyVariable;
var definedVariable;
function extraFunction(){return true;}
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