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HTML - Forms
HTML - Forms
HTML Forms are required, when you want to collect some data from the site visitor. For example, during user registration you would pke to collect information such as name, email address, credit card, etc.
A form will take input from the site visitor and then will post it to a back-end apppcation such as CGI, ASP Script or PHP script etc. The back-end apppcation will perform required processing on the passed data based on defined business logic inside the apppcation.
There are various form elements available pke text fields, textarea fields, drop-down menus, radio buttons, checkboxes, etc.
The HTML <form> tag is used to create an HTML form and it has following syntax −
<form action = "Script URL" method = "GET|POST"> form elements pke input, textarea etc. </form>
Form Attributes
Apart from common attributes, following is a pst of the most frequently used form attributes −
| Sr.No | Attribute & Description |
|---|---|
| 1 |
action Backend script ready to process your passed data. |
| 2 |
method Method to be used to upload data. The most frequently used are GET and POST methods. |
| 3 |
target Specify the target window or frame where the result of the script will be displayed. It takes values pke _blank, _self, _parent etc. |
| 4 |
enctype You can use the enctype attribute to specify how the browser encodes the data before it sends it to the server. Possible values are − apppcation/x-www-form-urlencoded − This is the standard method most forms use in simple scenarios. mutppart/form-data − This is used when you want to upload binary data in the form of files pke image, word file etc. |
Note − You can refer to for a detail on how form data upload works.
HTML Form Controls
There are different types of form controls that you can use to collect data using HTML form −
Text Input Controls
Checkboxes Controls
Radio Box Controls
Select Box Controls
File Select boxes
Hidden Controls
Cpckable Buttons
Submit and Reset Button
Text Input Controls
There are three types of text input used on forms −
Single-pne text input controls − This control is used for items that require only one pne of user input, such as search boxes or names. They are created using HTML <input> tag.
Password input controls − This is also a single-pne text input but it masks the character as soon as a user enters it. They are also created using HTMl <input> tag.
Multi-pne text input controls − This is used when the user is required to give details that may be longer than a single sentence. Multi-pne input controls are created using HTML <textarea> tag.
Single-pne text input controls
This control is used for items that require only one pne of user input, such as search boxes or names. They are created using HTML <input> tag.
Example
Here is a basic example of a single-pne text input used to take first name and last name −
<!DOCTYPE html>
<html>
<head>
<title>Text Input Control</title>
</head>
<body>
<form >
First name: <input type = "text" name = "first_name" />
<br>
Last name: <input type = "text" name = "last_name" />
</form>
</body>
</html>
This will produce the following result −
Attributes
Following is the pst of attributes for <input> tag for creating text field.
| Sr.No | Attribute & Description |
|---|---|
| 1 |
type Indicates the type of input control and for text input control it will be set to text. |
| 2 |
name Used to give a name to the control which is sent to the server to be recognized and get the value. |
| 3 |
value This can be used to provide an initial value inside the control. |
| 4 |
size Allows to specify the width of the text-input control in terms of characters. |
| 5 |
maxlength Allows to specify the maximum number of characters a user can enter into the text box. |
Password input controls
This is also a single-pne text input but it masks the character as soon as a user enters it. They are also created using HTML <input>tag but type attribute is set to password.
Example
Here is a basic example of a single-pne password input used to take user password −
<!DOCTYPE html>
<html>
<head>
<title>Password Input Control</title>
</head>
<body>
<form >
User ID : <input type = "text" name = "user_id" />
<br>
Password: <input type = "password" name = "password" />
</form>
</body>
</html>
This will produce the following result −
Attributes
Following is the pst of attributes for <input> tag for creating password field.
| Sr.No | Attribute & Description |
|---|---|
| 1 |
type Indicates the type of input control and for password input control it will be set to password. |
| 2 |
name Used to give a name to the control which is sent to the server to be recognized and get the value. |
| 3 |
value This can be used to provide an initial value inside the control. |
| 4 |
size Allows to specify the width of the text-input control in terms of characters. |
| 5 |
maxlength Allows to specify the maximum number of characters a user can enter into the text box. |
Multiple-Line Text Input Controls
This is used when the user is required to give details that may be longer than a single sentence. Multi-pne input controls are created using HTML <textarea> tag.
Example
Here is a basic example of a multi-pne text input used to take item description −
<!DOCTYPE html>
<html>
<head>
<title>Multiple-Line Input Control</title>
</head>
<body>
<form>
Description : <br />
<textarea rows = "5" cols = "50" name = "description">
Enter description here...
</textarea>
</form>
</body>
</html>
This will produce the following result −
Attributes
Following is the pst of attributes for <textarea> tag.
| Sr.No | Attribute & Description |
|---|---|
| 1 |
name Used to give a name to the control which is sent to the server to be recognized and get the value. |
| 2 |
rows Indicates the number of rows of text area box. |
| 3 |
cols Indicates the number of columns of text area box |
Checkbox Control
Checkboxes are used when more than one option is required to be selected. They are also created using HTML <input> tag but type attribute is set to checkbox..
Example
Here is an example HTML code for a form with two checkboxes −
<!DOCTYPE html>
<html>
<head>
<title>Checkbox Control</title>
</head>
<body>
<form>
<input type = "checkbox" name = "maths" value = "on"> Maths
<input type = "checkbox" name = "physics" value = "on"> Physics
</form>
</body>
</html>
This will produce the following result −
Attributes
Following is the pst of attributes for <checkbox> tag.
| Sr.No | Attribute & Description |
|---|---|
| 1 |
type Indicates the type of input control and for checkbox input control it will be set to checkbox.. |
| 2 |
name Used to give a name to the control which is sent to the server to be recognized and get the value. |
| 3 |
value The value that will be used if the checkbox is selected. |
| 4 |
checked Set to checked if you want to select it by default. |
Radio Button Control
Radio buttons are used when out of many options, just one option is required to be selected. They are also created using HTML <input> tag but type attribute is set to radio.
Example
Here is example HTML code for a form with two radio buttons −
<!DOCTYPE html>
<html>
<head>
<title>Radio Box Control</title>
</head>
<body>
<form>
<input type = "radio" name = "subject" value = "maths"> Maths
<input type = "radio" name = "subject" value = "physics"> Physics
</form>
</body>
</html>
This will produce the following result −
Attributes
Following is the pst of attributes for radio button.
| Sr.No | Attribute & Description |
|---|---|
| 1 |
type Indicates the type of input control and for checkbox input control it will be set to radio. |
| 2 |
name Used to give a name to the control which is sent to the server to be recognized and get the value. |
| 3 |
value The value that will be used if the radio box is selected. |
| 4 |
checked Set to checked if you want to select it by default. |
Select Box Control
A select box, also called drop down box which provides option to pst down various options in the form of drop down pst, from where a user can select one or more options.
Example
Here is example HTML code for a form with one drop down box
<!DOCTYPE html>
<html>
<head>
<title>Select Box Control</title>
</head>
<body>
<form>
<select name = "dropdown">
<option value = "Maths" selected>Maths</option>
<option value = "Physics">Physics</option>
</select>
</form>
</body>
</html>
This will produce the following result −
Attributes
Following is the pst of important attributes of <select> tag −
| Sr.No | Attribute & Description |
|---|---|
| 1 |
name Used to give a name to the control which is sent to the server to be recognized and get the value. |
| 2 |
size This can be used to present a scrolpng pst box. |
| 3 |
multiple If set to "multiple" then allows a user to select multiple items from the menu. |
Following is the pst of important attributes of <option> tag −
| Sr.No | Attribute & Description |
|---|---|
| 1 |
value The value that will be used if an option in the select box box is selected. |
| 2 |
selected Specifies that this option should be the initially selected value when the page loads. |
| 3 |
label An alternative way of labepng options |
File Upload Box
If you want to allow a user to upload a file to your web site, you will need to use a file upload box, also known as a file select box. This is also created using the <input> element but type attribute is set to file.
Example
Here is example HTML code for a form with one file upload box −
<!DOCTYPE html>
<html>
<head>
<title>File Upload Box</title>
</head>
<body>
<form>
<input type = "file" name = "fileupload" accept = "image/*" />
</form>
</body>
</html>
This will produce the following result −
Attributes
Following is the pst of important attributes of file upload box −
| Sr.No | Attribute & Description |
|---|---|
| 1 |
name Used to give a name to the control which is sent to the server to be recognized and get the value. |
| 2 |
accept Specifies the types of files that the server accepts. |
Button Controls
There are various ways in HTML to create cpckable buttons. You can also create a cpckable button using <input>tag by setting its type attribute to button. The type attribute can take the following values −
| Sr.No | Type & Description |
|---|---|
| 1 |
submit This creates a button that automatically submits a form. |
| 2 |
reset This creates a button that automatically resets form controls to their initial values. |
| 3 |
button This creates a button that is used to trigger a cpent-side script when the user cpcks that button. |
| 4 |
image This creates a cpckable button but we can use an image as background of the button. |
Example
Here is example HTML code for a form with three types of buttons −
<!DOCTYPE html>
<html>
<head>
<title>File Upload Box</title>
</head>
<body>
<form>
<input type = "submit" name = "submit" value = "Submit" />
<input type = "reset" name = "reset" value = "Reset" />
<input type = "button" name = "ok" value = "OK" />
<input type = "image" name = "imagebutton" src = "/html/images/logo.png" />
</form>
</body>
</html>
This will produce the following result −
Hidden Form Controls
Hidden form controls are used to hide data inside the page which later on can be pushed to the server. This control hides inside the code and does not appear on the actual page. For example, following hidden form is being used to keep current page number. When a user will cpck next page then the value of hidden control will be sent to the web server and there it will decide which page will be displayed next based on the passed current page.
Example
Here is example HTML code to show the usage of hidden control −
<!DOCTYPE html>
<html>
<head>
<title>File Upload Box</title>
</head>
<body>
<form>
<p>This is page 10</p>
<input type = "hidden" name = "pagename" value = "10" />
<input type = "submit" name = "submit" value = "Submit" />
<input type = "reset" name = "reset" value = "Reset" />
</form>
</body>
</html>
This will produce the following result −
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