IE8 and JQuery's trim()

Question

I am making use of trim() like so:

if($(\'#group_field\').val().trim()!=\'\'){

Where group_field is an input element of type t

Answer 1

Another option will be to define the method directly on String in case it's missing:

if(typeof String.prototype.trim !== 'function') {
  String.prototype.trim = function() {
    //Your implementation here. Might be worth looking at perf comparison at
    //http://blog.stevenlevithan.com/archives/faster-trim-javascript
    //
    //The most common one is perhaps this:
    return this.replace(/^\s+|\s+$/g, ''); 
  }
}

Then trim will work regardless of the browser:

var result = "   trim me  ".trim();