"document.getElementByClass is not a function"


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8 ответа

I am trying to run a function onclick of any button with class="stopMusic". I'm getting an error in Firebug

document.getElementByClass is not a function

Here is my code:

var stopMusicExt = document.getElementByClass("stopButton");
    stopButton.onclick = function() {
        var ta = document.getElementByClass("stopButton");
        ta.value = "";
Автор: user547794 Источник Размещён: 13.11.2019 11:31

Ответы (8)

233 плюса


You probably meant document.getElementsByClassName() (and then grabbing the first item off the resulting node list):

var stopMusicExt = document.getElementsByClassName("stopButton")[0];

stopButton.onclick = function() {
    var ta = document.getElementsByClassName("stopButton")[0];
    ta.value = "";

You may still get the error

document.getElementsByClassName is not a function

in older browsers, though, in which case you can provide a fallback implementation if you need to support those older browsers.

Автор: BoltClock Размещён: 20.09.2011 05:23

14 плюса

As others have said, you're not using the right function name and it doesn't exist univerally in all browsers.

If you need to do cross-browser fetching of anything other than an element with an id with document.getElementById(), then I would strongly suggest you get a library that supports CSS3 selectors across all browsers. It will save you a massive amount of development time, testing and bug fixing. The easiest thing to do is to just use jQuery because it's so widely available, has excellent documentation, has free CDN access and has an excellent community of people behind it to answer questions. If that seems like more than you need, then you can get Sizzle which is just a selector library (it's actually the selector engine inside of jQuery and others). I've used it by itself in other projects and it's easy, productive and small.

If you want to select multiple nodes at once, you can do that many different ways. If you give them all the same class, you can do that with:

var list = document.getElementsByClassName("myButton");
for (var i = 0; i < list.length; i++) {
    // list[i] is a node with the desired class name

and it will return a list of nodes that have that class name.

In Sizzle, it would be this:

var list = Sizzle(".myButton");
for (var i = 0; i < list.length; i++) {
    // list[i] is a node with the desired class name

In jQuery, it would be this:

$(".myButton").each(function(index, element) {
    // element is a node with the desired class name

In both Sizzle and jQuery, you can put multiple class names into the selector like this and use much more complicated and powerful selectors:

$(".myButton, .myInput, .homepage.gallery, #submitButton").each(function(index, element) {
    // element is a node that matches the selector
Автор: jfriend00 Размещён: 20.09.2011 05:45

10 плюса

Before jumping into any further error checking please first check whether its

document.getElementsByClassName() itself.

double check its getElements and not getElement

Автор: neo Размещён: 18.06.2016 05:35

8 плюса

It should be getElementsByClassName, and not getElementByClass. See this - https://developer.mozilla.org/en/DOM/document.getElementsByClassName.

Note that some browsers/versions may not support this.

Автор: Saket Размещён: 20.09.2011 05:26

0 плюса

document.querySelectorAll works pretty well and allows you to further narrow down your selection.


Автор: KuN Размещён: 30.11.2016 04:38

0 плюса

you spelt it wrongly, it should be " getElementsByClassName ",

var objs = document.getElementsByClassName("stopButton");
var stopMusicExt = objs[0]; //retrieve the first node in the stack

//your remaining function goes down here.. 
ta.value = "";

document.getElementsByClassName - returns a stack of nodes with more than one item, since CLASS attributes are used to assign to multiple objects...

Автор: Andaeiii Размещён: 19.02.2019 02:42

0 плюса

The getElementByClass does not exists, probably you want to use getElementsByClassName. However you can use alternative approach (used in angular/vue/react... templates)

function stop(ta) {
  console.log(ta.value) // document['player'].stopMusicExt(ta.value);
<input type="button" onclick="stop(this)" class="stopMusic" value='Stop 1'>
<input type="button" onclick="stop(this)" class="stopMusic" value='Stop 2'>

Автор: Kamil Kiełczewski Размещён: 14.04.2019 10:37

-1 плюса

    enter code here
var stopMusicExt = document.getElementByClass("stopButton").value;
    stopButton.onclick = function() {
        var ta = document.getElementByClass("stopButton");
        ta.value = "";

// .value will hold all data from class stopButton
Автор: Gajender Singh Размещён: 20.09.2016 04:29
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