How to dynamically change CSS class of DIV tag?

Question

I am using JavaScript. I have a variable var boolVal that either evaluates to true/false. On my page, I have a div tag.

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Answer 1

You can edit inline styles on a DOM element like so (height in this example):

document.getElementById("element").style.height = height + "px";

Basic syntax is:

document.getElementById("div1").style.[style property] = [value];

Syntax for the style property can vary and might not be exactly what it is in a CSS file. For example, background-color in a CSS file would be 'backgroundColor` in the above example.