Html NoScript tag

Html-NoScript-tag.jpg

What is an HTML NoScript tag?

HTML NoScript tags are used to define alternative content for users. Those who have disabled scripting from the browser want to access the web page. The element can be used between the tags. using NoScript tags inside the component Must have tags. If the user’s browser does not support the script. Yet, the text inside the element will be displayed. An example of an Html NoScript tag is given below decline.

Html NoScript tag Explain 01
<!--noscript is alternate content for people with scripts disabled in their browser-->
<head>
  <noscript><style>h1{color:red;}</style></noscript>
<!--noscript in <head> can only have <link>, <style>, or <meta> elements-->
</head>
<body>
  <script>document.body.innerHTML += "Hello, World!"</script>
  <noscript>You do not have JavaScript enabled in your browser.</noscript>
</body>
Html NoScript tag Explain 02
<noscript>
  <!-- anchor linking to external file -->
  <a href="https://beginnerwebdeveloper.com/">External Link</a>
</noscript>
<p>Rocks!</p>

Summary

His article shows a solution that replaces the element with an external one. Uninterrupted JavaScript function. Html NoScript tag. The function does not publish alternative content if JavaScript is disabled. enabled/solves the problem of agents using older JavaScript. By assigning this function,, they will publish the content as intended. This ensures nice degradation of the script and full accessibility to alternative content. Feel free to comment on anything you think can be improved.

Html NoScript tag Explain 03
<noscript>
<p>This content is only displayed if 
	scripting is disabled...</p>
</noscript>

In his book “PPK on JavaScript,.” Peter-Paul Koch points out that the element has a limitation. Modern user agents with JavaScript enabled will hide content contained within. The tags and reveal. It is JavaScript is disabled. User agents that do not support JavaScript will display. The content within it. User agents with partial/antiquated. It never gets seen.

This has an impact on the accessibility of the content. If your writing is targeted at modern, standards-based. Compliant and competent JavaScript user agents. Employing the Html NoScript tag element is no problem. This article looks at one such solution.

  1. <script>  
  2. document.write(“Welcome to JavaTpoint”)  
  3. </script>  

<noscript>Sorry! Your browser does not support JavaScript.!</noscript>

Html NoScript tag Explain 04
<noscript>
scripting is disabled
</noscript>
Html NoScript tag Explain 05
<head>
    <script type="text/javascript">
    </script>
</head>
<body>
    <noscript>
        You must enable JavaScript in your browser to use this site!
    </noscript>
</body>

Building the unobtrusive DOM/JavaScript

In this section, I’ll take you through building up the two leading teams of JavaScript.

Writing the if() portion of the function

  1. Between the else, if parentheses place the document.getElementById expression to test. if it is supported by the user agent.
    • If it is supported, the function will continue, and the div content will remain hidden.
    • If it is not supported, the function will end. revealing the div content. Establishing graceful degradation of the script.
  2. Declare the container div element and identify its id value as the external. Unobtrusive “hook” to the markup.
  3. Instruct the parent div to remove all child content within it.
Html NoScript tag Explain 06
<noscript>
  <!-- anchor linking to external file -->
  <a href="https://www.mozilla.com/">External Link</a>
</noscript>
<p>Rocks!</p>

Writing the else if() portion of the function

  1. Between the else, if parentheses place the document.getElementById expression to test. if it is by the user agent.
    • If it is support the function will continue, and the div content will remain hidden.
    • If it is not support the function will end and the div content will be publis. establishing graceful degradation of the script.
  2. Return the element id where the style will be applied.
  3. Set its style.display to “none” to control the presentation aspect of the child content.

The script is contained in the Html NoScript tag .js file. Which is kept external and linked to the web page as described in the “Building the Markup” section.

Html NoScript tag Explain 07

function MYMODULE_page_attachments(array &$page) {
  $fallback = '<link href="fallback.css" rel="stylesheet" />';
  $noscript = array(
    '#tag' => 'noscript',
    '#value' => Markup::create($fallback),
  );
  $page['#attached']['html_head'][] = [$noscript, 'mymodule'];
}

Html NoScript tag Explain 08

<form action="calcSquare.php">
 <p>
  <label for=x>Number</label>:
  <input id="x" name="x" type="number">
 </p>
 <script>
  var x = document.getElementById('x');
  var output = document.createElement('p');
  output.textContent = 'Type a number; it will be squared right then!';
  x.form.appendChild(output);
  x.form.onsubmit = function () { return false; }
  x.oninput = function () {
    var v = x.valueAsNumber;
    output.textContent = v + ' squared is ' + v * v;
  };
 </script>
 <noscript>
  <input type=submit value="Calculate Square">
 </noscript>
</form>

Definition and Usage

The tag defines alternate content for users. that have disabled scripts in their browser or have a browser that doesn’t support script. The element can be in both and. When used inside. the element. must contain only and <meta> elements. The content inside the <noscript> element will be. if scripts are not supported or are Uin the user’s browser.</p>

Html NoScript tag Explain 09

<form action="calcSquare.php">
 <p>
  <label for=x>Number</label>:
  <input id="x" name="x" type="number">
 </p>
 <input id="submit" type=submit value="Calculate Square">
 <script>
  var x = document.getElementById('x');
  var output = document.createElement('p');
  output.textContent = 'Type a number; it will be squared right then!';
  x.form.appendChild(output);
  x.form.onsubmit = function () { return false; }
  x.oninput = function () {
    var v = x.valueAsNumber;
    output.textContent = v + ' squared is ' + v * v;
  };
  var submit = document.getElementById('submit');
  submit.parentNode.removeChild(submit);
 </script>
</form>
<script>
document.getElementById("demo").innerHTML = "Hello JavaScript!";
</script>

<noscript>Sorry, your browser does not support JavaScript!</noscript>

The solution

How can the behavior be by the NoScript element. be enabled in these antiquated/partially-capable JavaScript user agents? The workflow for my solution is as follows:

  • Insert an unobtrusive JavaScript “hook” via an id attribute value. the parent container’s opening tag.
  • Associate the “hook” with an external JavaScript function. Which sets up a parent-to-child relationship between the container and its content.
    • JavaScript is active. The external function keeps the alternative content hidden.
    • If the user agent cannot interpret the JavaScript expressions. The alternative content in the markup.
    • JavaScript is unactive, the function no longer works. The alternative content in the markup. This ensures graceful degradation of the script.

Important Note: if the ability to hide the alternative content. JavaScript does not exist. The browser/user agent will be able to render. The range ensures accessibility and graceful degradation.

Building the Markup

In this section, you’ll build up the markup part of the example.

  1. In the <head></head> tags of the web page. insert a <script> element containing. the path to the external noscript.js JavaScript file.
  2. Create a <div></div> within the <body></body> tags to contain the hidden content.
  3. Give the opening tag of the <div> element an id attribute with a value of “NoScript”. That <div id=”NoScript”> this sets the unobtrusive hook to. the external JavaScript function noscript().
  4. all elements and content to be hide JavaScript is active. Within the <div id=”noscript”></div> container.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
  <title>noscript_example</title>
  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  <script src="scripts/noscript.js" type="text/javascript"></script>
</head>
<body>
  <div id="noscript">
    <p>
      Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
    </p>
    <ul>
      <li><a href="#">Hyperlink A</a></li>
      <li><a href="#">Hyperlink B</a></li>
    </ul>
  </div>
</body>
</html>	

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