Im trying to modify something when clicking on a input text field. The id of that field is cart[1223686][qty].

Tried your standard:

$j("#cart[1223686][qty]").click(function() {
alert("Handler for .click() called.");

But nothing. What is wrong?

(Yes, $j is correct)

jQuery thinks you're looking for #cart with attributes [1223686][qty].

if you want to look for that element, you have to specify the id attribute and value instead. Like this :

$j("[id='cart[1223686][qty]']").click(function() {
    alert("Handler for .click() called.");
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