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JavaScript

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my code has an error, please see link to snapshot for your reference: https://w.trhou.se/jm7jcdd4wh

first error:

Uncaught ReferenceError: $ is not defined at app.js:9

fix attempted: var tShirtDesignDropdown = ('#design'); or var $tShirtDesignDropdown = document.querySelector('#design');

second error:

Uncaught ReferenceError: $tShirtDesignDropdown is not defined at app.js:35

how do i define tShirtDesignDropdown? any hints, comments or suggestions are welcome also if you see anymore errors on the codes please let me know. and i will be glad to change them