Javascript get div width

ok I am having a problem in regards to achieving the width of a div tag

the div tag is dynamic, so its content can change.

Now what would the javascript code be to get the width of the div.

document.getElementById("div_id").style.width doesn't seem to work and the offsetwidth command doesn't work either

how would you do this?

thanks

This can be a bit tricky depending on the details. This thread discusses some of the issues involved.

Looking back, it's nice to see that all these years later getting the width of an element can be as simple as the following with libraries such as jQuery.