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Question

I need help on this one:

In the document there are several input fields with <div class="quantity"><input .. > This is automatically generated by the system and i have no access to alter this.

So i need a way with jquery to track the onchange function when the input changes..

What is a good way to achieve this???

var updateInput = document.getElementById(".quantity input");

if ( updateInput ????? ) { 
      alert("Hallo") 
};

Thank for your guidance!!

Answer 1

getElementById does not work on class names. You asked for jquery, why not use change() ?

$('.quantity input').change(function() {
    alert('Input changed');
});

From the manual:

The change event is sent to an element when its value changes. This event is limited to <input> elements, <textarea> boxes and <select> elements. For select boxes, checkboxes, and radio buttons, the event is fired immediately when the user makes a selection with the mouse, but for the other element types the event is deferred until the element loses focus.

Demo: http://jsfiddle.net/Madmartigan/yzGYU/