enable and disable textfield in jquery

This question already has an answer here:

Disable/enable an input with jQuery? 11 answers

How to make text box enable and disable in jquery [duplicate] 2 answers

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Try this:

jQuery(document).ready(function(){
     jQuery("#cca label.control input").on('change', function (e) {
    alert('I am pretty sure the text box changed');
    e.preventDefault();
  });
});

If that doesn't work then please respond with what your console returns when you type jQuery("#cca label.control input").length

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