我有下面的样本html,有一个DIV有100%的宽度。它包含了一些元素。在执行窗口调整大小时,内部元素可能会被重新定位,div的尺寸可能会改变。我在问是否有可能挂钩div的维度变化事件?以及如何做到这一点?我目前绑定回调函数到目标DIV上的jQuery调整大小事件,但是,没有输出控制台日志,如下所示:

<html>
<head>
    <script type="text/javascript" language="javascript" src="http://code.jquery.com/jquery-1.6.1.min.js"></script>
    <script type="text/javascript" language="javascript">
            $('#test_div').bind('resize', function(){
                console.log('resized');
            });
    </script>
</head>
<body>
    <div id="test_div" style="width: 100%; min-height: 30px; border: 1px dashed pink;">
        <input type="button" value="button 1" />
        <input type="button" value="button 2" />
        <input type="button" value="button 3" />
    </div>
</body>
</html>

当前回答

ResizeSensor.js是一个巨大库的一部分,但我把它的功能简化为:

function ResizeSensor(element, callback)
{
    let zIndex = parseInt(getComputedStyle(element));
    if(isNaN(zIndex)) { zIndex = 0; };
    zIndex--;

    let expand = document.createElement('div');
    expand.style.position = "absolute";
    expand.style.left = "0px";
    expand.style.top = "0px";
    expand.style.right = "0px";
    expand.style.bottom = "0px";
    expand.style.overflow = "hidden";
    expand.style.zIndex = zIndex;
    expand.style.visibility = "hidden";

    let expandChild = document.createElement('div');
    expandChild.style.position = "absolute";
    expandChild.style.left = "0px";
    expandChild.style.top = "0px";
    expandChild.style.width = "10000000px";
    expandChild.style.height = "10000000px";
    expand.appendChild(expandChild);

    let shrink = document.createElement('div');
    shrink.style.position = "absolute";
    shrink.style.left = "0px";
    shrink.style.top = "0px";
    shrink.style.right = "0px";
    shrink.style.bottom = "0px";
    shrink.style.overflow = "hidden";
    shrink.style.zIndex = zIndex;
    shrink.style.visibility = "hidden";

    let shrinkChild = document.createElement('div');
    shrinkChild.style.position = "absolute";
    shrinkChild.style.left = "0px";
    shrinkChild.style.top = "0px";
    shrinkChild.style.width = "200%";
    shrinkChild.style.height = "200%";
    shrink.appendChild(shrinkChild);

    element.appendChild(expand);
    element.appendChild(shrink);

    function setScroll()
    {
        expand.scrollLeft = 10000000;
        expand.scrollTop = 10000000;

        shrink.scrollLeft = 10000000;
        shrink.scrollTop = 10000000;
    };
    setScroll();

    let size = element.getBoundingClientRect();

    let currentWidth = size.width;
    let currentHeight = size.height;

    let onScroll = function()
    {
        let size = element.getBoundingClientRect();

        let newWidth = size.width;
        let newHeight = size.height;

        if(newWidth != currentWidth || newHeight != currentHeight)
        {
            currentWidth = newWidth;
            currentHeight = newHeight;

            callback();
        }

        setScroll();
    };

    expand.addEventListener('scroll', onScroll);
    shrink.addEventListener('scroll', onScroll);
};

如何使用:

let container = document.querySelector(".container");
new ResizeSensor(container, function()
{
    console.log("dimension changed:", container.clientWidth, container.clientHeight);
});

其他回答

通过@gman扩展这个答案,这里有一个允许每个元素多次回调的函数,将宽度和高度分解为一个准事件对象。请参阅关于堆栈溢出的嵌入式演示(您可能需要彻底调整主浏览器的大小以触发它)

function elementResizeWatcher(element, callback) { var resolve=function(element) { return (typeof element==='string' ? document[ ['.','#'].indexOf(element.charAt(0)) < 0 ? "getElementById" : "querySelector" ] (element) : element); }, observer, watched = [], checkForElementChanges = function (data) { var w=data.el.offsetWidth,h=data.el.offsetHeight; if ( data.offsetWidth !== w || data.offsetHeight !== h ) { data.offsetWidth = w; data.offsetHeight = h; data.cb({ target : data.el, width : w, height : h }); } }, checkForChanges=function(){ watched.forEach(checkForElementChanges); }, started=false, self = { start: function () { if (!started) { // Listen to the window resize event window.addEventListener("resize", checkForChanges); // Listen to the element being checked for width and height changes observer = new MutationObserver(checkForChanges); observer.observe(document.body, { attributes: true, childList: true, characterData: true, subtree: true }); started=true; } }, stop : function ( ) { if (started) { window.removeEventListener('resize', checkForChanges); observer.disconnect(); started = false; } }, addListener : function (element,callback) { if (typeof callback!=='function') return; var el = resolve(element); if (typeof el==='object') { watched.push({ el : el, offsetWidth : el.offsetWidth, offsetHeight : el.offsetHeight, cb : callback }); } }, removeListener : function (element,callback) { var el = resolve(element); watched = watched.filter(function(data){ return !((data.el===el) && (data.cb===callback)); }); } }; self.addListener(element,callback); self.start(); return self; } var watcher = elementResizeWatcher("#resize_me_on_stack_overflow", function(e){ e.target.innerHTML="i am "+e.width+"px&nbsp;x&nbsp;"+e.height+"px"; }); watcher.addListener(".resize_metoo",function(e) { e.target.innerHTML="and i am "+e.width+"px&nbsp;x&nbsp;"+e.height+"px"; }); var mainsize_info = document.getElementById("mainsize"); watcher.addListener(document.body,function(e) { mainsize_info.innerHTML=e.width+"px&nbsp;x&nbsp;"+e.height+"px"; }); #resize_me_on_stack_overflow{ background-color:lime; } .resize_metoo { background-color:yellow; font-size:36pt; width:50%; } <p> resize the main browser window! <span id="mainsize"><span> </p> <p id="resize_me_on_stack_overflow"> hey, resize me. </p> <p class="resize_metoo"> resize me too. </p>

我的jQuery插件在所有元素上启用了“调整大小”事件,而不仅仅是窗口。

https://github.com/dustinpoissant/ResizeTriggering

$("#myElement") .resizeTriggering().on("resize", function(e){
  // Code to handle resize
}); 

从长远来看,您将能够使用ResizeObserver。

new ResizeObserver(callback).observe(element);

不幸的是,目前许多浏览器默认不支持它。

同时,您可以像下面这样使用函数。因为,大部分元素大小的变化将来自窗口大小的调整或DOM中的某些更改。你可以通过窗口的resize事件来监听窗口的大小调整,也可以使用MutationObserver监听DOM的变化。

下面是一个函数的例子,当提供的元素的大小因为这两个事件中的任何一个而改变时,它会回调你:

var onResize = function(element, callback) {
  if (!onResize.watchedElementData) {
    // First time we are called, create a list of watched elements
    // and hook up the event listeners.
    onResize.watchedElementData = [];

    var checkForChanges = function() {
      onResize.watchedElementData.forEach(function(data) {
        if (data.element.offsetWidth !== data.offsetWidth ||
            data.element.offsetHeight !== data.offsetHeight) {
          data.offsetWidth = data.element.offsetWidth;
          data.offsetHeight = data.element.offsetHeight;
          data.callback();
        }
      });
    };

    // Listen to the window's size changes
    window.addEventListener('resize', checkForChanges);

    // Listen to changes on the elements in the page that affect layout 
    var observer = new MutationObserver(checkForChanges);
    observer.observe(document.body, { 
      attributes: true,
      childList: true,
      characterData: true,
      subtree: true 
    });
  }

  // Save the element we are watching
  onResize.watchedElementData.push({
    element: element,
    offsetWidth: element.offsetWidth,
    offsetHeight: element.offsetHeight,
    callback: callback
  });
};

使用Clay.js (https://github.com/zzarcon/clay),检测元素大小的变化非常简单:

var el = new Clay('.element');

el.on('resize', function(size) {
    console.log(size.height, size.width);
});

您可以使用iframe或对象使用contentWindow或contentDocument调整大小。没有setInterval或setTimeout

的步骤:

将元素位置设置为相对位置 在里面添加一个透明的绝对隐藏IFRAME 听IFRAME。contentWindow - onresize事件

HTML的一个例子:

<div style="height:50px;background-color:red;position:relative;border:1px solid red">
<iframe style=width:100%;height:100%;position:absolute;border:none;background-color:transparent allowtransparency=true>
</iframe>
This is my div
</div>

Javascript:

$('div').width(100).height(100);
$('div').animate({width:200},2000);

$('object').attr({
    type : 'text/html'
})
$('object').on('resize,onresize,load,onload',function(){
    console.log('ooooooooonload')
})

$($('iframe')[0].contentWindow).on('resize',function(){
    console.log('div changed')
})

运行示例

JsFiddle: https://jsfiddle.net/qq8p470d/


看到更多:

粘土-它是基于元素-大小调整事件 element-resize-event