IE8 and JQuery's trim()

I am making use of trim() like so:

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

Where group_field is an input element of type text. This works in Firefox but when I try it on IE8 it gives me this error:

Message: Object doesn't support this property or method

When I remove the trim(), it works fine on IE8. I thought the way I am using trim() is correct?

Thanks all for any help

Solution 1:

Try this instead:

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

More Info:

• http://api.jquery.com/jQuery.trim/

Solution 2:

You should use $.trim, like this:

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

Solution 3:

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();

Solution 4:

As far as I know, Javascript String does not have the method trim. If you want to use function trim, then use

<script>
    $.trim(string);
</script>