jQuery keyup function doesnt work?

Question

My HTML file:

Answer 1

Apart from a typo around your missing }, when your script.js file runs (in the section), the rest of your document does not exist. The easiest way to work around this is to wrap your script in a document ready handler, eg

jQuery(function($) {
    $('#workerID').on('keyup', function() {
        alert('key up');
    });
});

Alternatively, you could move your script to the bottom of the document, eg

or use event delegation which allows you to bind events to a parent element (or the document), eg

$(document).on('keyup', '#workerID', function() {
    alert('key up');
});