How to detect DIV's dimension changed?

 

I've the following sample html, there is a DIV which has 100% width. It contains some elements. While performing windows re-sizing, the inner elements may be re-positioned, and the dimension of the div may change. I'm asking if it is possible to hook the div's dimension change event? and How to do that? I currently bind the callback function to the jQuery resize event on the target DIV, however, no console log is outputted, see below:

调整大小之前在这里输入图像描述

<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>

There is a very efficient method to determine if a element's size has been changed.

http://marcj.github.io/css-element-queries/

This library has a class ResizeSensor which can be used for resize detection.
It uses an event-based approach, so it's damn fast and doesn't waste CPU time.

Example: 

new ResizeSensor(jQuery('#divId'), function(){ 
    console.log('content dimension changed');
});

Please do not use the jQuery onresize plugin as it uses setTimeout() loop to check for changes.
THIS IS INCREDIBLY SLOW AND NOT ACCURATE .

Disclosure: I am directly associated with this library.

这个新标准是Chrome 64中提供的Resize Observer API。 

function outputsize() {
 width.value = textbox.offsetWidth
 height.value = textbox.offsetHeight
}
outputsize()

new ResizeObserver(outputsize).observe(textbox)
Width: <output id="width">0</output><br>
Height: <output id="height">0</output><br>
<textarea id="textbox">Resize me</textarea><br>

You have to bind the resize event on the window object, not on a generic html element.

You could then use this: 

$(window).resize(function() {
    ...
});

and within the callback function you can check the new width of your div calling 

$('.a-selector').width();

So, the answer to your question is no , you can't bind the resize event to a div.

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