How to get element by class name

Question

Using JavaScript  we can get element by id using following syntax   var x document getElementById  by id      I tried following to get element by class   var y document getElementByClass  by class      But it resulted into error    getElementByClass is not function   How can I get an element by its class

User · Accepted Answer

The name of the DOM function is actually getElementsByClassName, not getElementByClassName, simply because more than one element on the page can have the same class, hence: Elements.

The return value of this will be a NodeList instance, or a superset of the NodeList (FF, for instance returns an instance of HTMLCollection). At any rate: the return value is an array-like object:

var y = document.getElementsByClassName('foo');
var aNode = y[0];

If, for some reason you need the return object as an array, you can do that easily, because of its magic length property:

var arrFromList = Array.prototype.slice.call(y);
//or as per AntonB's comment:
var arrFromList = [].slice.call(y);

As yckart suggested querySelector('.foo') and querySelectorAll('.foo') would be preferable, though, as they are, indeed, better supported (93.99% vs 87.24%), according to caniuse.com:

User · Answer

You need to use the document getElementsByClassName  class name     and dont forget that the returned value is an array of elements so if you want the first one use   document getElementsByClassName  class name   0   UPDATE  Now you can use   document querySelector   class name   to get the first element with the class name CSS class  null will be returned if non of the elements on the page has this class name   or document querySelectorAll   class name   to get a NodeList of elements with the class name css class  empty NodeList will be returned if non of   the elements on the the page has this class name

User · Answer

you can use  getElementsByClassName   suppose you have some elements and applied a class name  test   so  you can get elements like as following  var tests   document getElementsByClassName  test      its returns an instance NodeList  or its superset  HTMLCollection  FF    Read more

User · Answer

Another option is to use querySelector   foo   or querySelectorAll   foo   which have broader browser support than getElementsByClassName   http   caniuse com  feat queryselector  http   caniuse com  feat getelementsbyclassname

[javascript] How to get element by class name?

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