run $.ajax() when end typed with format specified. how is it?

Question

i want, when user typed, 0000/00/00(it is format date) after the end of typing run anything(example: AJAX CALL), how is it?

like:
if user typed: 2011/05/04 -> run: $.ajax()...
if user typed: 2011/05 -> not run: $.ajax()...
...

only thing for run $.ajax() is true type this format 0000/00/00.
I hope you understand my purpose.
With respect.

Answer 1

HTML:

<input type="text" name="datefield" onchange="validateField(this)" />

JS:

function validateField() {
   var val = this.value;
   if (val.length < 10) {
      return;
   }
   if (!val.match(/\d\d\d\d\/\d\d\/\d\d/)) {
      return;
   }
   ... do ajax call here
}