What is javascript:void(0);

What is javascript:void(0);? This operator allows inserting expressions that produce side effects into places where an expression that evaluates to undefined is desired.

The void operator evaluates the given expression and then returns undefined.

Example Usage

<a href="javascript:void(0);">Click here to do nothing</a>
<a href="javascript:void(document.body.style.backgroundColor='green');">Click here for green background</a>

See this post for further info: Different ways to run a JavaScript function

Further Reading