action keyup after the third charecter

Question

Hi could someone help me figure out how to stop a function running until a specific number of characters are pressed?

currently using the following function:

$('input#q').keyup

this works as soon as you press any key...

Answer 1

Something like this should start firing code after 3 letters have been added:

Live Example

JavaScript

$('input#q').keyup( function() {
   if( this.value.length < 4 ) return;
   /* code to run below */
   $('#output').val(this.value); 
});

HTML

<input id="q" />
<br /><br />
<input id="output"/>

Answer 2

you could do :

$('input#q').keyup(function(){
  if($(this).val().length > 3)
  {
    //do something
  }
});