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>
您可以尝试以下代码片段中的代码，它使用纯javascript满足您的需求。(如果您想测试div，则运行代码片段并单击整页链接以触发div调整大小的警报。)
基于这是一个100毫秒的setInterval的事实，我敢说我的PC没有发现它太多的CPU饥饿。(0.1%的CPU被用作测试时Chrome中所有打开的选项卡的总和。)但这只是一个div，如果你想为大量的元素这样做，那么是的，它可能是非常CPU饥饿。
无论如何，您总是可以使用单击事件来停止div-resize嗅探。
var width = 0;
var interval = setInterval(function(){
if(width <= 0){
width = document.getElementById("test_div").clientWidth;
}
if(document.getElementById("test_div").clientWidth!==width) {
alert('resized div');
width = document.getElementById("test_div").clientWidth;
}
}, 100);
<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>
你也可以检查一下小提琴
更新
var width = 0;
function myInterval() {
var interval = setInterval(function(){
if(width <= 0){
width = document.getElementById("test_div").clientWidth;
}
if(document.getElementById("test_div").clientWidth!==width) {
alert('resized');
width = document.getElementById("test_div").clientWidth;
}
}, 100);
return interval;
}
var interval = myInterval();
document.getElementById("clickMe").addEventListener( "click" , function() {
if(typeof interval!=="undefined") {
clearInterval(interval);
alert("stopped div-resize sniffing");
}
});
document.getElementById("clickMeToo").addEventListener( "click" , function() {
myInterval();
alert("started div-resize sniffing");
});
<div id="test_div" style="width: 100%; min-height: 30px; border: 1px dashed pink;">
<input type="button" value="button 1" id="clickMe" />
<input type="button" value="button 2" id="clickMeToo" />
<input type="button" value="button 3" />
</div>
更新的小提琴
这几乎是顶部答案的精确副本，但不是链接，它只是重要的代码的一部分，翻译成IMO更易读，更容易理解。其他一些小的改变包括使用cloneNode()，和不把html放入js字符串。很小的东西，但是你可以复制粘贴它就可以了。
它的工作方式是让两个看不见的div填充你正在观看的元素，然后在每个div中设置一个触发器，并设置一个滚动位置，如果大小发生变化，将导致触发滚动变化。
所有真正的荣誉都属于Marc J，但如果你只是在寻找相关的代码，这里是:
window.El = {}
El.resizeSensorNode = undefined;
El.initResizeNode = function() {
var fillParent = "display: block; position: absolute; left: 0; top: 0; right: 0; bottom: 0; overflow: hidden; z-index: -1; visibility: hidden;";
var triggerStyle = "position: absolute; left: 0; top: 0; transition: 0s;";
var resizeSensor = El.resizeSensorNode = document.createElement("resizeSensor");
resizeSensor.style = fillParent;
var expandSensor = document.createElement("div");
expandSensor.style = fillParent;
resizeSensor.appendChild(expandSensor);
var trigger = document.createElement("div");
trigger.style = triggerStyle;
expandSensor.appendChild(trigger);
var shrinkSensor = expandSensor.cloneNode(true);
shrinkSensor.firstChild.style = triggerStyle + " width: 200%; height: 200%";
resizeSensor.appendChild(shrinkSensor);
}
El.onSizeChange = function(domNode, fn) {
if (!domNode) return;
if (domNode.resizeListeners) {
domNode.resizeListeners.push(fn);
return;
}
domNode.resizeListeners = [];
domNode.resizeListeners.push(fn);
if(El.resizeSensorNode == undefined)
El.initResizeNode();
domNode.resizeSensor = El.resizeSensorNode.cloneNode(true);
domNode.appendChild(domNode.resizeSensor);
var expand = domNode.resizeSensor.firstChild;
var expandTrigger = expand.firstChild;
var shrink = domNode.resizeSensor.childNodes[1];
var reset = function() {
expandTrigger.style.width = '100000px';
expandTrigger.style.height = '100000px';
expand.scrollLeft = 100000;
expand.scrollTop = 100000;
shrink.scrollLeft = 100000;
shrink.scrollTop = 100000;
};
reset();
var hasChanged, frameRequest, newWidth, newHeight;
var lastWidth = domNode.offsetWidth;
var lastHeight = domNode.offsetHeight;
var onResized = function() {
frameRequest = undefined;
if (!hasChanged) return;
lastWidth = newWidth;
lastHeight = newHeight;
var listeners = domNode.resizeListeners;
for(var i = 0; listeners && i < listeners.length; i++)
listeners[i]();
};
var onScroll = function() {
newWidth = domNode.offsetWidth;
newHeight = domNode.offsetHeight;
hasChanged = newWidth != lastWidth || newHeight != lastHeight;
if (hasChanged && !frameRequest) {
frameRequest = requestAnimationFrame(onResized);
}
reset();
};
expand.addEventListener("scroll", onScroll);
shrink.addEventListener("scroll", onScroll);
}
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
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);
});
