By Alan


2009-12-19 17:38:46 8 Comments

I'm trying to toggle the visibility of certain DIV elements on a website depending on the class of each DIV. I'm using a basic JavaScript snippet to toggle them. The problem is that the script only uses getElementById, as getElementByClass is not supported in JavaScript. And unfortunately I do have to use class and not id to name the DIVs because the DIV names are dynamically generated by my XSLT stylesheet using certain category names.

I know that certain browsers now support getElementByClass, but since Internet Explorer doesn't I don't want to go that route.

I've found scripts using functions to get elements by class (such as #8 on this page: http://www.dustindiaz.com/top-ten-javascript/), but I can't figure out how to integrate them with with my toggle script.

Here's the HTML code. The DIVs themselves are missing since they are generated on page load with XML/XSLT.

Main Question: How do I get the below Toggle script to get Element by Class instead of get Element by ID?

<html>

<head>

<!--This is the TOGGLE script-->
<script type="text/javascript">
<!--
    function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'block')
          e.style.display = 'none';
       else
          e.style.display = 'block';
    }
//-->
</script>

</head>

<!--the XML/XSLT page contents will be loaded here, with DIVs named by Class separating dozens of li's-->

<a href="#" onclick="toggle_visibility('class1');">Click here to toggle visibility of class 1 objects</a>

<a href="#" onclick="toggle_visibility('class2');">Click here to toggle visibility of class 2 objects</a>

</body>
</html>

7 comments

@Reltpid 2018-10-16 03:55:32

Append IDs at the class declaration

.aclass, #hashone, #hashtwo{ ...codes... }
document.getElementById( "hashone" ).style.visibility = "hidden";

@Vishwa 2017-11-23 08:33:36

document.getElementsByClassName('CLASSNAME')[0].style.display = 'none';

Acyually by using getElementsByClassName, it returns an array of multiple classes. Because same class name could be used in more than one instance inside same HTML page. We use array element id to target the class we need, in my case, it's first instance of the given class name.So I've used [0]

@Manvendra Priyadarshi 2016-06-28 10:04:21

Use it to access class in Javascript.

<script type="text/javascript">
var var_name = document.getElementsByClassName("class_name")[0];
</script>

@CMS 2009-12-19 17:45:02

The getElementsByClassName method is now natively supported by the most recent versions of Firefox, Safari, Chrome, IE and Opera, you could make a function to check if a native implementation is available, otherwise use the Dustin Diaz method:

function getElementsByClassName(node,classname) {
  if (node.getElementsByClassName) { // use native implementation if available
    return node.getElementsByClassName(classname);
  } else {
    return (function getElementsByClass(searchClass,node) {
        if ( node == null )
          node = document;
        var classElements = [],
            els = node.getElementsByTagName("*"),
            elsLen = els.length,
            pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)"), i, j;

        for (i = 0, j = 0; i < elsLen; i++) {
          if ( pattern.test(els[i].className) ) {
              classElements[j] = els[i];
              j++;
          }
        }
        return classElements;
    })(classname, node);
  }
}

Usage:

function toggle_visibility(className) {
   var elements = getElementsByClassName(document, className),
       n = elements.length;
   for (var i = 0; i < n; i++) {
     var e = elements[i];

     if(e.style.display == 'block') {
       e.style.display = 'none';
     } else {
       e.style.display = 'block';
     }
  }
}

@Tomáลก Zato - Reinstate Monica 2013-12-25 13:29:45

Why do you use that inner function instead of just plain code?

@John Meyer 2015-07-24 12:36:59

-1 for example usage assuming that all elements on the screen have block display. In toggle_visibility, if e is a <span> then it should be 'inline' not 'block'. A much more robust solution is to define a CSS class: .invisible { display: none !important } and use JavaScript (or jQuery) to assign and unassign that class from elements

@Sampson 2009-12-19 17:40:47

Modern browsers have support for document.getElementsByClassName. You can see the full breakdown of which vendors provide this functionality at caniuse. If you're looking to extend support into older browsers, you may want to consider a selector engine like that found in jQuery or a polyfill.

Older Answer

You'll want to check into jQuery, which will allow the following:

$(".classname").hide(); // hides everything with class 'classname'

Google offers a hosted jQuery source-file, so you can reference it and be up-and-running in moments. Include the following in your page:

<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
  $(function(){
    $(".classname").hide();
  });
</script>

@Paulo Santos 2009-12-19 17:45:04

Although good, the Google hosted jQuery is useful only for the most simple things, because of the cross-site scripting security implemented by most modern browsers.

@Sampson 2009-12-19 17:46:15

You may also download the source file from jQuery.com and reference it locally.

@Chetan S 2009-12-19 20:39:13

@Paulo: Cross-site scripting is not applicable for <script> tags. Google hosted jQuery is designed specifically for production websites (as a CDN). If your site is https, just make sure you use the https version to avoid mixed content warning.

@Chetan S 2009-12-19 20:42:34

In fact, <script> tag injection is the basis of cross-site JSONP requests.

@Dark Falcon 2009-12-19 20:48:08

Paulo, you do realize that once you include jQuery with the <script> tag, there are no cross-site restrictions at all?

@thylorion 2013-04-17 18:46:13

My solution:

First create "<style>" tags with an ID.

<style id="YourID">
    .YourClass {background-color:red}
</style>

Then, I create a function in JavaScript like this:

document.getElementById('YourID').innerHTML = '.YourClass {background-color:blue}'

Worked like a charm for me.

@Chris Forrence 2013-04-17 19:05:29

Line breaks (<br>) are useless/invalid within a style tag

@cregox 2010-09-16 17:28:28

adding to CMS's answer, this is a more generic approach of toggle_visibility I've just used myself:

function toggle_visibility(className,display) {
   var elements = getElementsByClassName(document, className),
       n = elements.length;
   for (var i = 0; i < n; i++) {
     var e = elements[i];

     if(display.length > 0) {
       e.style.display = display;
     } else {
       if(e.style.display == 'block') {
         e.style.display = 'none';
       } else {
         e.style.display = 'block';
       }
     }
  }
}

Related Questions

Sponsored Content

43 Answered Questions

[SOLVED] How do I remove a property from a JavaScript object?

96 Answered Questions

[SOLVED] How can I remove a specific item from an array?

  • 2011-04-23 22:17:18
  • Walker
  • 6931675 View
  • 8494 Score
  • 96 Answer
  • Tags:   javascript arrays

41 Answered Questions

[SOLVED] For-each over an array in JavaScript

61 Answered Questions

[SOLVED] How do I include a JavaScript file in another JavaScript file?

28 Answered Questions

[SOLVED] What does "use strict" do in JavaScript, and what is the reasoning behind it?

95 Answered Questions

[SOLVED] How to validate an email address in JavaScript

86 Answered Questions

[SOLVED] How do JavaScript closures work?

58 Answered Questions

[SOLVED] How do I redirect to another webpage?

3 Answered Questions

57 Answered Questions

[SOLVED] How do I check if an element is hidden in jQuery?

Sponsored Content