Html 通过 JavaScript 按类更改值属性

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时间:2020-08-29 15:05:38  来源:igfitidea点击:

Change value attribute by class via JavaScript

javascripthtmlsetattributegetelementsbyclassname

提问by Cagey215

I have the following HTML:

我有以下 HTML:

<input class="vertical-tabs-active-tab" type="hidden" value="account" name="tabs__active_tab">

I need JavaScript that will change the value of "account" to "yolo".

我需要将“帐户”的值更改为“yolo”的 JavaScript。

I thought I could do this:

我以为我可以这样做:

document.getElementsByClassName('vertical-tabs-active-tab').setAttribute("value", "yolo");

But that produces an error of:

但这会产生以下错误:

document.getElementsByClassName(...).setAttribute is not a function

I'm not able to add an "id" to input, I have to change the value based on class.

我无法在输入中添加“id”,我必须根据类更改值。

回答by tymeJV

document.getElementsByClassName('vertical-tabs-active-tab')[0].setAttribute("value", "yolo");

document.getElementsByClassNamereturns an array of elements, specify the index of the element you wish to change.

document.getElementsByClassName返回一个元素数组,指定要更改的元素的索引。

回答by Archangel33

This may do what you want:

这可能会做你想做的:

var elms = document.getElementsByClassName('vertical-tabs-active-tab')
for (var i = 0; i < elms.length; i++) {
  if (elms[i].getAttribute("value") === "account"){
   elms[i].setAttribute("value", "yolo");
  }
}

回答by Anton Bessonov

getElementsByClassName return a list/array of elements. Pick element through index and set value on it. You can also iterate over elements. getElementById return only one element.

getElement sByClassName 返回元素列表/数组。通过索引选择元素并在其上设置值。您还可以迭代元素。getElementById 只返回一个元素。