How to detect DIV's dimension changed?

Question

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,

Answer 1

Pure Javascript solution, but works only if the element is resized with the css resize button:

1. store element size with offsetWidth and offsetHeight;
2. add an onclick event listener on this element;
3. when triggered, compare curent offsetWidth and offsetHeight with stored values, and if different, do what you want and update these values.