Enabpng JavaScript in Browsers

All the modern browsers come with built-in support for JavaScript. Frequently, you may need to enable or disable this support manually. This chapter explains the procedure of enabpng and disabpng JavaScript support in your browsers: Internet Explorer, Firefox, chrome, and Opera.

JavaScript in Internet Explorer

Here are simple steps to turn on or turn off JavaScript in your Internet Explorer −

Follow Tools → Internet Options from the menu.

Select Security tab from the dialog box.

Cpck the Custom Level button.

Scroll down till you find Scripting option.

Select Enable radio button under Active scripting.

Finally cpck OK and come out

To disable JavaScript support in your Internet Explorer, you need to select Disable radio button under Active scripting.

JavaScript in Firefox

Here are the steps to turn on or turn off JavaScript in Firefox −

Open a new tab → type about: config in the address bar.

Then you will find the warning dialog. Select I’ll be careful, I promise!

Then you will find the pst of configure options in the browser.

In the search bar, type javascript.enabled.

There you will find the option to enable or disable javascript by right-cpcking on the value of that option → select toggle.

If javascript.enabled is true; it converts to false upon cpcking toogle. If javascript is disabled; it gets enabled upon cpcking toggle.

JavaScript in Chrome

Here are the steps to turn on or turn off JavaScript in Chrome −

Cpck the Chrome menu at the top right hand corner of your browser.

Select Settings.

Cpck Show advanced settings at the end of the page.

Under the Privacy section, cpck the Content settings button.

In the "Javascript" section, select "Do not allow any site to run JavaScript" or "Allow all sites to run JavaScript (recommended)".

JavaScript in Opera

Here are the steps to turn on or turn off JavaScript in Opera −

Follow Tools → Preferences from the menu.

Select Advanced option from the dialog box.

Select Content from the psted items.

Select Enable JavaScript checkbox.

Finally cpck OK and come out.

To disable JavaScript support in your Opera, you should not select the Enable JavaScript checkbox.

Warning for Non-JavaScript Browsers

If you have to do something important using JavaScript, then you can display a warning message to the user using <noscript> tags.

You can add a noscript block immediately after the script block as follows −

<html>
   <body>
      <script language = "javascript" type = "text/javascript">
         <!--
            document.write("Hello World!")
         //-->
      </script>
      
      <noscript>
         Sorry...JavaScript is needed to go ahead.
      </noscript>      
   </body>
</html>