javascript 任何方法，如用于 div 的 onshow()
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any method like onshow() for a div
提问by user695663
I have a div that is shown or hidden dynamically. I want some function to execute when the div is shown for the first time. Let me know how to do that.
我有一个动态显示或隐藏的 div。我想要一些函数在第一次显示 div 时执行。让我知道怎么做。
<div id="firstDiv"></div>
<div id="secondDiv"></div>
so when $('#secondDiv").show();I want to perform some function.
所以当$('#secondDiv").show();我想执行某些功能时。
How I can do that?
我怎么能做到这一点？
回答by James Allardice
You can provide a callback function to the showfunction, which will be executed upon completion of show:
您可以为该show函数提供一个回调函数，该函数将在完成时执行show：
$("#secondDiv").show(function() {
//Do something
});
As mentioned in the comments, this will behave as an animation. If you want showto behave as normal (i.e. the element appears instantly with no animation) you need to supply a duration parameter of 0 to the showfunction. The difference is demonstrated in this fiddle.
正如评论中提到的，这将表现为动画。如果您想show表现得正常（即元素立即出现而没有动画），您需要为show函数提供持续时间参数 0 。差异在这个 fiddle 中得到了证明。
