This document discusses how to enable or disable JavaScript support in various browsers. It provides steps for Internet Explorer, Firefox, Chrome, and Opera. It also discusses using <noscript> tags to warn users with non-JavaScript browsers.
2. • 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 enabling and
disabling 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.
• Click the Custom Level button.
• Scroll down till you find Scripting option.
• Select Enable radio button under Active scripting.
• Finally click OK and come out
• To disable JavaScript support in your Internet Explorer, you need to selectDisable radio button
under Active scripting.
3. 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 list 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-
clicking on the value of that option → select toggle.
• If javascript.enabled is true; it converts to false upon clicking toogle. If
javascript is disabled; it gets enabled upon clicking toggle.
4. JavaScript in Chrome
• Here are the steps to turn on or turn off JavaScript in Chrome −
• Click the Chrome menu at the top right hand corner of your
browser.
• Select Settings.
• Click Show advanced settings at the end of the page.
• Under the Privacy section, click 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)".
5. 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 listed items.
• Select Enable JavaScript checkbox.
• Finally click OK and come out.
• To disable JavaScript support in your Opera, you should not select
the Enable JavaScript checkbox.
6. 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>
• Now, if the user's browser does not support JavaScript or JavaScript is not
enabled, then the message from </noscript> will be displayed on the screen.
7. Thank You
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