I am working on a check-in app though Google Sheets and want to make a search function that that takes a sport name as input in an HTML form and then returns information about t
JQuery id selectors must be prefixed with # so to grab the value from the the 'sport-name' input you'll need to select it using
var sportInput = $('#sport-name').val();
Additionally, as Robin comments above, if you want to use the JQuery library you'll need to load it, the code you've shown indicates you might not have done this?
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
</head>
Although if this were the case you'd probably be seeing a '$ is not defined' error straight away.