Detect all changes to a <input type="text"> (immediately) using JQuery

This jQuery code catches immediate changes to any element, and should work across all browsers:

 $('.myElements').each(function() {
   var elem = $(this);

   // Save current value of element
   elem.data('oldVal', elem.val());

   // Look for changes in the value
   elem.bind("propertychange change click keyup input paste", function(event){
      // If value has changed...
      if (elem.data('oldVal') != elem.val()) {
       // Updated stored value
       elem.data('oldVal', elem.val());

       // Do action
       ....
     }
   });
 });

A real-time fancy solution for jQuery >= 1.9

$("#input-id").on("change keyup paste", function(){
    dosomething();
})

if you also want to detect "click" event, just:

$("#input-id").on("change keyup paste click", function(){
    dosomething();
})

if you're using jQuery <= 1.4, just use live instead of on.

Unfortunately, I think setInterval wins the prize:

<input type=text id=input_id />
<script>
setInterval(function() { ObserveInputValue($('#input_id').val()); }, 100);
</script>

It's the cleanest solution, at only 1 line of code. It's also the most robust, since you don't have to worry about all the different events/ways an input can get a value.

The downsides of using 'setInterval' don't seem to apply in this case:

• The 100ms latency? For many applications, 100ms is fast enough.
• Added load on the browser? In general, adding lots of heavy-weight setIntervals on your page is bad. But in this particular case, the added page load is undetectable.
• It doesn't scale to many inputs? Most pages don't have more than a handful of inputs, which you can sniff all in the same setInterval.