Keyup function doesn't work

I'm sorry but I still use my own code, I just follow ur instructions to use ci url to controller/method

<form action="" method="post">
<div class="container mt-2">
<div class="row g-2">
<div class="input-group input-group-sm mb-2">
<input type="text" class="form-control" id="cari" name="cari" placeholder="search city or region.." maxlength="16" size="35%">
<button class="btn btn-success" type="button" name="search" id="search"">Submit</button>
</div>
<hr class="mb-0">
<div class="row" name="result" id="result"></div>
<hr class="mb-0">
<small class="text-muted mt-0 pt-0">Made with ? <a href="/">CodeIgniter</a></small>
</div>
</div>
</form>

When I click submit, this whole form appears again below the result div between <hr class="mb-0">