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
亚当的答案的扩展，以防你需要防止违约，这里有一个工作:
$(document).on('DOMNodeRemoved', function(e){
if($(e.target).hasClass('my-elm') && !e.target.hasAttribute('is-clone')){
let clone = $(e.target).clone();
$(clone).attr('is-clone', ''); //allows the clone to be removed without triggering the function again
//you can do stuff to clone here (ex: add a fade animation)
$(clone).insertAfter(e.target);
setTimeout(() => {
//optional remove clone after 1 second
$(clone).remove();
}, 1000);
}
});
其他回答
亚当的答案的扩展，以防你需要防止违约，这里有一个工作:
$(document).on('DOMNodeRemoved', function(e){
if($(e.target).hasClass('my-elm') && !e.target.hasAttribute('is-clone')){
let clone = $(e.target).clone();
$(clone).attr('is-clone', ''); //allows the clone to be removed without triggering the function again
//you can do stuff to clone here (ex: add a fade animation)
$(clone).insertAfter(e.target);
setTimeout(() => {
//optional remove clone after 1 second
$(clone).remove();
}, 1000);
}
});
我不确定是否有此事件句柄，因此您必须保留DOM的副本，并在某种轮询循环中与现有DOM进行比较——这可能相当麻烦。Firebug可以做到这一点——如果您检查HTML并运行一些dom更改，它会在Firebug控制台中以黄色高亮显示更改。
或者，你可以创建一个删除函数…
var removeElements = function(selector) {
var elems = jQuery(selector);
// Your code to notify the removal of the element here...
alert(elems.length + " elements removed");
jQuery(selector).remove();
};
// Sample usage
removeElements("#some-element");
removeElements("p");
removeElements(".myclass");
为此，可以使用jQuery特殊事件。
简单地说，
设置:
(function($){
$.event.special.destroyed = {
remove: function(o) {
if (o.handler) {
o.handler()
}
}
}
})(jQuery)
用法:
$('.thing').bind('destroyed', function() {
// do stuff
})
回答Pierre和DesignerGuy评论的附录:
要在调用$('.thing').off('destroyed')时不触发回调，请将if条件更改为:if (o.handler && o.type !== 'destroyed'){…｝
对于那些使用jQuery UI的人:
jQuery UI已经覆盖了一些jQuery方法来实现remove事件，该事件不仅在你显式删除给定元素时被处理，而且在元素被任何自清理jQuery方法(例如replace, html等)从DOM中删除时也会被处理。这基本上允许您在jQuery“清理”与DOM元素相关的事件和数据时，将钩子放入相同的事件中。
John Resig表示，他愿意在未来版本的jQuery核心中实现这个事件，但我不确定它目前的位置。
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
