How to recreate a GET request from an HTML form with a different trigger

Question

I have an HTML form:

<form action="" method="get">
    <input type="text" name="seq" placeholder="Search by ID">
    <input type="submit" value="Search">
</form>

when submitting the string 000 for example, this sends the GET request:

myurl/?seq=000

and the page reloads with the extra information. so far so good.

How can I recreate this exact behaviour but with a different trigger instead of the submit button for sending the GET request? for example, I attempted to use an onkeyup to link to a javascript function but I cannot find a way of making a simple javascript GET request that actually loads a page.