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");
我们也可以使用domnodermoved:
$("#youridwhichremoved").on("DOMNodeRemoved", function () {
// do stuff
})
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
没有用于删除元素的内置事件，但是可以通过伪扩展jQuery的默认删除方法来创建一个事件。注意，必须在实际删除回调以保持引用之前调用回调。
(function() {
var ev = new $.Event('remove'),
orig = $.fn.remove;
$.fn.remove = function() {
$(this).trigger(ev);
return orig.apply(this, arguments);
}
})();
$('#some-element').bind('remove', function() {
console.log('removed!');
// do pre-mortem stuff here
// 'this' is still a reference to the element, before removing it
});
// some other js code here [...]
$('#some-element').remove();
注意:这个答案的一些问题已经被其他的帖子概括出来了。
当通过html() replace()或其他jQuery方法删除节点时，这将不起作用 这个事件出现了 jQuery UI覆盖删除以及
这个问题最优雅的解决方案似乎是:https://stackoverflow.com/a/10172676/216941
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/
