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Get the value of a select element when it changes in jQuery

Get the value of a select element when it changes in jQuery

David Y.

The ProblemJump To Solution

Using jQuery, how can I retrieve the value of a <select> element when it changes?

The Solution

We can do this by binding a callback function to the relevant jQuery selector’s change event:

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<script src="https://code.jquery.com/jquery-3.7.1.min.js" integrity="sha256-/JqT3SQfawRcv/BIHPThkBvs0OEvtFFmqPF/lYI/Cxo=" crossorigin="anonymous"></script> <select id="cities"> <option value="paris">Paris</option> <option value="beijing">Beijing</option> <option value="cairo">Cairo</option> </select> <script> $('#cities').on('change', function () { console.log(`Cities selector changed to ${this.value}.`); }); </script>

Note that we’ve used the <select> element’s ID rather than $('select') to avoid applying this callback to the change event of every <select> element on our page. If this is the desired functionality, we can change $('#cities') to $('select').

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<script src="https://code.jquery.com/jquery-3.7.1.min.js" integrity="sha256-/JqT3SQfawRcv/BIHPThkBvs0OEvtFFmqPF/lYI/Cxo=" crossorigin="anonymous"></script> <select id="cities"> <option value="paris">Paris</option> <option value="beijing">Beijing</option> <option value="cairo">Cairo</option> </select> <select id="countries"> <option value="france">Paris</option> <option value="china">China</option> <option value="egypt">Egypt</option> </select> <script> $('select').on('change', function () { console.log(`A selector was changed to ${this.value}.`); }); </script>

We could achieve the same result as the first code snippet without using jQuery by changing the code inside the <script> tags and substituting document.getElementById for the jQuery $ selector and using .addEventListener instead of .on:

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<select id="cities"> <option value="paris">Paris</option> <option value="beijing">Beijing</option> <option value="cairo">Cairo</option> </select> <script> document.getElementById('cities').addEventListener('change', function () { console.log(`Cities selector changed to ${this.value}.`); }); </script>

The behavior of the second snippet can be achieved without jQuery by using document.querySelector and Array.forEach:

Click to Copy
<select id="cities"> <option value="paris">Paris</option> <option value="beijing">Beijing</option> <option value="cairo">Cairo</option> </select> <select id="countries"> <option value="france">Paris</option> <option value="china">China</option> <option value="egypt">Egypt</option> </select> <script> document.querySelectorAll('select').forEach(select => { select.addEventListener('change', function () { console.log(`A selector was changed to ${this.value}.`); }); }); </script>
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