JavaScript:监听属性变化? [英] JavaScript: Listen for attribute change?

问题描述

是否可以在 JavaScript 中监听属性值的变化?例如:

Is it possible in JavaScript to listen for a change of attribute value? For example:

var element=document.querySelector('…');
element.addEventListener( ? ,doit,false);

element.setAttribute('something','whatever');

function doit() {

}

我想对 something 属性中的任何更改做出响应.

I would like to respond to any change in the something attribute.

我已经阅读了 MutationObserver 对象，以及它的替代品(包括使用动画事件的那个).据我所知，它们是关于对实际 DOM 的更改.我对特定 DOM 元素的属性更改更感兴趣，所以我认为不是这样.当然在我的实验中它似乎不起作用.

I have read up on the MutationObserver object, as well as alternatives to that (including the one which uses animation events). As far as I can tell, they are about changes to the actual DOM. I’m more interested in attribute changes to a particular DOM element, so I don’t think that’s it. Certainly in my experimenting it doesn’t seem to work.

我想在没有 jQuery 的情况下 做到这一点.

I would like to do this without jQuery.

谢谢

推荐答案

您需要 MutationObserver，在代码片段中我使用了 setTimeout 来模拟修改属性

You need MutationObserver, Here in snippet I have used setTimeout to simulate modifying attribute

var element = document.querySelector('#test');
setTimeout(function() {
  element.setAttribute('data-text', 'whatever');
}, 5000)

var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {
    if (mutation.type === "attributes") {
      console.log("attributes changed")
    }
  });
});

observer.observe(element, {
  attributes: true //configure it to listen to attribute changes
});

<div id="test">Dummy Text</div>

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