我试图弄清楚如何执行一些js代码时，一个元素从页面删除:
jQuery('#some-element').remove(); // remove some element from the page
/* need to figure out how to independently detect the above happened */
有没有专门的活动，比如:
jQuery('#some-element').onremoval( function() {
// do post-mortem stuff here
});
当前回答
只需要jQuery(不需要jQuery UI)
(我已经从jQuery UI框架中提取了这个扩展)
适用于:empty()和html()和remove()
$.cleanData = ( function( orig ) {
return function( elems ) {
var events, elem, i;
for ( i = 0; ( elem = elems[ i ] ) != null; i++ ) {
try {
// Only trigger remove when necessary to save time
events = $._data( elem, "events" );
if ( events && events.remove ) {
$( elem ).triggerHandler( "remove" );
}
// Http://bugs.jquery.com/ticket/8235
} catch ( e ) {}
}
orig( elems );
};
} )( $.cleanData );
使用此解决方案，还可以解除事件处理程序的绑定。
$("YourElemSelector").off("remove");
试一试!——示例
$.cleanData = (function(orig) { return function(elems) { var events, elem, i; for (i = 0; (elem = elems[i]) != null; i++) { try { // Only trigger remove when necessary to save time events = $._data(elem, "events"); if (events && events.remove) { $(elem).triggerHandler("remove"); } // Http://bugs.jquery.com/ticket/8235 } catch (e) {} } orig(elems); }; })($.cleanData); $("#DivToBeRemoved").on("remove", function() { console.log("div was removed event fired"); }); $("p").on("remove", function() { console.log("p was removed event fired"); }); $("span").on("remove", function() { console.log("span was removed event fired"); }); // $("span").off("remove"); $("#DivToBeRemoved").on("click", function() { console.log("Div was clicked"); }); function RemoveDiv() { // $("#DivToBeRemoved").parent().html(""); $("#DivToBeRemoved").remove(); } <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <h3>OnRemove event handler attached to elements `div`, `p` and `span`.</h3> <div class="container"> <br> <button onclick="RemoveDiv();">Click here to remove div below</button> <div id="DivToBeRemoved"> DIV TO BE REMOVED contains 1 p element which in turn contains a span element <p>i am p (within div) <br><br><span>i am span (within div)</span></p> </div> </div>
附加演示- jsBin
其他回答
我们也可以使用domnodermoved:
$("#youridwhichremoved").on("DOMNodeRemoved", function () {
// do stuff
})
挂钩.remove()并不是最好的处理方法，因为有很多方法可以从页面中删除元素(例如，通过使用.html()， .replace()等)。
为了防止各种内存泄漏危险，jQuery将在内部尝试为每个被删除的元素调用jQuery. cleandata()函数，而不管使用什么方法来删除它。
查看这个答案了解更多细节:javascript内存泄漏
所以，为了得到最好的结果，你应该钩子cleanData函数，这正是jquery.event.destroyed插件所做的:
http://v3.javascriptmvc.com/jquery/dist/jquery.event.destroyed.js
你可以绑定到DOMNodeRemoved事件(DOM Level 3 WC3规范的一部分)。
适用于IE9，最新版本的Firefox和Chrome。
例子:
$(document).bind("DOMNodeRemoved", function(e)
{
alert("Removed: " + e.target.nodeName);
});
您还可以通过绑定到DOMNodeInserted来获得元素插入时的通知
这是如何创建一个jQuery实时删除监听器:
$(document).on('DOMNodeRemoved', function(e)
{
var $element = $(e.target).find('.element');
if ($element.length)
{
// do anything with $element
}
});
Or:
$(document).on('DOMNodeRemoved', function(e)
{
$(e.target).find('.element').each(function()
{
// do anything with $(this)
}
});
刚刚检查过，它已经内置在当前版本的JQuery中:
jQuery - v1.9.1
jQuery UI - v1.10.2
$("#myDiv").on("remove", function () {
alert("Element was removed");
})
重要:这是Jquery UI脚本(不是Jquery)的功能，所以你必须加载两个脚本(Jquery和Jquery - UI)使其工作。例如:http://jsfiddle.net/72RTz/
