How can I determine if a string only contains spaces, using javascript?

Question

How can I determine if an input string only contains spaces, using javascript?

Answer 1

Another good post for : Faster JavaScript Trim

You just need to apply trim function and check the length of the string. If the length after trimming is 0 - then the string contains only spaces.

var str = "data abc";
if((jQuery.trim( str )).length==0)
  alert("only spaces");
else 
  alert("contains other characters");

Answer 2

if (!input.match(/^\s*$/)) {
    //your turn...
}