我想执行一个函数时,一些div或输入被添加到html。 这可能吗?

例如,添加了一个文本输入,然后应该调用函数。


当前回答

2015年更新,新的MutationObserver被现代浏览器支持:

找到了,Chrome 18+,火狐14+

如果您需要支持较老的方法,您可以尝试使用其他方法,例如下面这个5年(!)年前的答案中提到的方法。那里有龙。享受:)


其他人正在更改文档?因为如果你可以完全控制这些变化,你只需要创建你自己的domChanged API——用一个函数或自定义事件——并在你修改东西的地方触发/调用它。

DOM Level-2有突变事件类型,但是旧版本的IE不支持它。请注意,突变事件在DOM3事件规范中已弃用,并且具有性能损失。

你可以尝试在IE中使用onpropertychange来模拟突变事件(如果它们都不可用,则退回到蛮力方法)。

对于一个完整的domChange,间隔可能是一个过度杀死。假设您需要存储整个文档的当前状态,并检查每个元素的每个属性是否相同。

也许如果您只对元素及其顺序感兴趣(如您在问题中提到的),getElementsByTagName("*")可以工作。如果您添加一个元素,删除一个元素,替换元素或更改文档的结构,这将自动触发。

我写了一个概念证明:

(function (window) {
    var last = +new Date();
    var delay = 100; // default delay

    // Manage event queue
    var stack = [];

    function callback() {
        var now = +new Date();
        if (now - last > delay) {
            for (var i = 0; i < stack.length; i++) {
                stack[i]();
            }
            last = now;
        }
    }

    // Public interface
    var onDomChange = function (fn, newdelay) {
        if (newdelay) delay = newdelay;
        stack.push(fn);
    };

    // Naive approach for compatibility
    function naive() {

        var last = document.getElementsByTagName('*');
        var lastlen = last.length;
        var timer = setTimeout(function check() {

            // get current state of the document
            var current = document.getElementsByTagName('*');
            var len = current.length;

            // if the length is different
            // it's fairly obvious
            if (len != lastlen) {
                // just make sure the loop finishes early
                last = [];
            }

            // go check every element in order
            for (var i = 0; i < len; i++) {
                if (current[i] !== last[i]) {
                    callback();
                    last = current;
                    lastlen = len;
                    break;
                }
            }

            // over, and over, and over again
            setTimeout(check, delay);

        }, delay);
    }

    //
    //  Check for mutation events support
    //

    var support = {};

    var el = document.documentElement;
    var remain = 3;

    // callback for the tests
    function decide() {
        if (support.DOMNodeInserted) {
            window.addEventListener("DOMContentLoaded", function () {
                if (support.DOMSubtreeModified) { // for FF 3+, Chrome
                    el.addEventListener('DOMSubtreeModified', callback, false);
                } else { // for FF 2, Safari, Opera 9.6+
                    el.addEventListener('DOMNodeInserted', callback, false);
                    el.addEventListener('DOMNodeRemoved', callback, false);
                }
            }, false);
        } else if (document.onpropertychange) { // for IE 5.5+
            document.onpropertychange = callback;
        } else { // fallback
            naive();
        }
    }

    // checks a particular event
    function test(event) {
        el.addEventListener(event, function fn() {
            support[event] = true;
            el.removeEventListener(event, fn, false);
            if (--remain === 0) decide();
        }, false);
    }

    // attach test events
    if (window.addEventListener) {
        test('DOMSubtreeModified');
        test('DOMNodeInserted');
        test('DOMNodeRemoved');
    } else {
        decide();
    }

    // do the dummy test
    var dummy = document.createElement("div");
    el.appendChild(dummy);
    el.removeChild(dummy);

    // expose
    window.onDomChange = onDomChange;
})(window);

用法:

onDomChange(function(){ 
    alert("The Times They Are a-Changin'");
});

这适用于IE 5.5+, FF 2+, Chrome, Safari 3+和Opera 9.6+

其他回答

或者你可以简单地创建你自己的事件,到处运行

 $("body").on("domChanged", function () {
                //dom is changed 
            });


 $(".button").click(function () {

          //do some change
          $("button").append("<span>i am the new change</span>");

          //fire event
          $("body").trigger("domChanged");

        });

完整的示例 http://jsfiddle.net/hbmaam/Mq7NX/

我最近写了一个插件,就是这样做的——jquery.initialize

你可以像使用.each函数一样使用它

$(".some-element").initialize( function(){
    $(this).css("color", "blue"); 
});

与.each的不同之处在于-它接受你的选择器,在本例中是.some-element,并等待将来使用该选择器的新元素,如果添加了这样的元素,它也将被初始化。

在我们的例子中,初始化函数只是将元素颜色改为蓝色。因此,如果我们添加新元素(无论是使用ajax还是F12检查器或任何东西),如:

$("<div/>").addClass('some-element').appendTo("body"); //new element will have blue color!

插件会立即初始化它。另外,plugin确保一个元素只初始化一次。因此,如果您添加了element,然后.detach()它从body中,然后再次添加它,它将不会再次初始化。

$("<div/>").addClass('some-element').appendTo("body").detach()
    .appendTo(".some-container");
//initialized only once

插件基于MutationObserver -它将在IE9和ie10上工作,并在自述页面上详细说明依赖关系。

MutationObserver = window.MutationObserver || window.WebKitMutationObserver;

var observer = new MutationObserver(function(mutations, observer) {
    // fired when a mutation occurs
    console.log(mutations, observer);
    // ...
});

// define what element should be observed by the observer
// and what types of mutations trigger the callback
observer.observe(document, {
  subtree: true,
  attributes: true
  //...
});

完整解释:https://stackoverflow.com/a/11546242/6569224

下面的例子改编自Mozilla Hacks的博客文章,并使用MutationObserver。

// Select the node that will be observed for mutations
var targetNode = document.getElementById('some-id');

// Options for the observer (which mutations to observe)
var config = { attributes: true, childList: true };

// Callback function to execute when mutations are observed
var callback = function(mutationsList) {
    for(var mutation of mutationsList) {
        if (mutation.type == 'childList') {
            console.log('A child node has been added or removed.');
        }
        else if (mutation.type == 'attributes') {
            console.log('The ' + mutation.attributeName + ' attribute was modified.');
        }
    }
};

// Create an observer instance linked to the callback function
var observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
observer.observe(targetNode, config);

// Later, you can stop observing
observer.disconnect();

浏览器支持:Chrome 18+, Firefox 14+, IE 11+, Safari 6+

使用MutationObserver界面,如Gabriele Romanato的博客所示

找到了,Chrome 18+,火狐14+

// The node to be monitored
var target = $( "#content" )[0];

// Create an observer instance
var observer = new MutationObserver(function( mutations ) {
  mutations.forEach(function( mutation ) {
    var newNodes = mutation.addedNodes; // DOM NodeList
    if( newNodes !== null ) { // If there are new nodes added
        var $nodes = $( newNodes ); // jQuery set
        $nodes.each(function() {
            var $node = $( this );
            if( $node.hasClass( "message" ) ) {
                // do something
            }
        });
    }
  });    
});

// Configuration of the observer:
var config = { 
    attributes: true, 
    childList: true, 
    characterData: true 
};

// Pass in the target node, as well as the observer options
observer.observe(target, config);

// Later, you can stop observing
observer.disconnect();