类更改的事件触发器 [英] Event trigger on a class change
本文介绍了类更改的事件触发器的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
当包含触发器类的div标签发生更改时,我希望我的活动触发。
I'd like my event to be triggered when a div tag containing a trigger class is changed.
我不知道如何让它听取课程的'添加事件。
I have no idea how to make it listen to the class' adding event.
<div id="test">test</div>
<script type="text/javascript">
document.getElementById.setAttribute("class", "trigger");
function workOnClassAdd() {
alert("I'm triggered");
}
</script>
推荐答案
那么突变事件,但它们已被弃用,未来会有Mutation Observers,但很长一段时间内它们都不会得到完全支持。那么你能做些什么呢?
Well there were mutation events, but they were deprecated and the future there will be Mutation Observers, but they will not be fully supported for a long time. So what can you do in the mean time?
你可以用一个计时器来检查元素。
You can use a timer to check the element.
function addClassNameListener(elemId, callback) {
var elem = document.getElementById(elemId);
var lastClassName = elem.className;
window.setInterval( function() {
var className = elem.className;
if (className !== lastClassName) {
callback();
lastClassName = className;
}
},10);
}
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