'IsNullOrWhitespace' in JavaScript?

Question

Is there a JavaScript equivalent to .NET\'s String.IsNullOrWhitespace so that I can check if a textbox on the client-side has any visible text in it?

I\'d rather do

Answer 1

trim() is a useful string-function that JS is missing..

Add it:

String.prototype.trim = function() { return this.replace(/^\s+|\s+$/g,"") }

Then: if (document.form.field.value.trim() == "")