Ajax wont stop if false - php

Question

I have problem with my ajax,
here my index:
<form name="add_name" id="add_name">
<div class="col-lg-12">
<div class="form-row mb-2">
ID Kurir :
<div class="col">
<input type="text" id="idkurir" name="idkurir" placeholder="Input ID Kurir" class="idkurir" autofocus />
</div>
Nama Kurir :
<div class="col">
<input type="text" id="namakurir" name="namakurir" value="Nama Kurir" class="namakurir" readonly />
</div>
No Laporan :
<div class="col">
<input type="text" id="nolaporan" name="nolaporan" value="No Laporan" readonly />
</div>
Date :
<div class="col">
<?php $now=date('d-m-Y H:i'); ?>
<input type="text" name="date" value=<?php echo "'$now'"; ?> readonly />
</div>
</div>
<div class="row">
<div class="col-lg-6">
<table class="table table-bordered" id="dynamic_field1">
<tr>
<td colspan=2 align=center><strong>Antar Ulang</strong></td>
</tr>
<tr>
<td><input type="text" name="awbau[]" placeholder="Enter AWB" class="form-control name_listau" /></td>
<td><button type="button" name="addau" id="addau" class="btn btn-success">Add More</button></td>
</tr>
</table>
</div>
<div class="col-lg-6">
<table class="table table-bordered" id="dynamic_field2">
<tr>
<td colspan=2 align=center><strong>Undelivery</strong></td>
</tr>
<tr>
<td><input type="text" name="awbundel[]" placeholder="Enter AWB" class="form-control name_listundel" /></td>
<td><button type="button" name="addundel" id="addundel" class="btn btn-success">Add More</button></td>
</tr>
</table>
</div>
</div>
<center><input type="button" name="submit" id="submit" class="btn btn-info btn-block mb-4 mr-2" value="Submit Data" /></center>
</form>
here my ajax script :
$(document).on("keypress", ".idkurir", function(e) {
var idkurir = $('#idkurir').val();
if (e.which == 13) {
$.ajax({
type: "POST",
url: "checkdata.php",
data: {
idkurir: idkurir
},
success: function(response) {
if (response == 1) {
alert("Kurir sudah laporan");
} else {
if (response == "ID Kurir tidak di temukan") {
alert(response);
} else {
var d = new Date();
var today_date = ("0" + d.getDate()).slice(-2) + ("0" + (d.getMonth() + 1)).slice(-2);
$('#nolaporan').val(idkurir + today_date);
$('#namakurir').val(response);
}
}
}
});
}
});
and here my checkdata to check if data exist :
session_start();
$connect = mysql_connect("localhost", "root", "");
mysql_select_db("reportchecker", $connect);
$idkurir = $_POST["idkurir"];
$nolaporan = $idkurir . date("dm");
$sql = "SELECT * FROM jampulang WHERE nolaporan = '$nolaporan'";
$result = mysql_query($sql, $connect);
$count = mysql_num_rows($result);
$response = [];
$sql2 = "SELECT * FROM kurir WHERE idkurir = '$idkurir'";
$result2 = mysql_query($sql2, $connect) or die(mysql_error());
$count2 = mysql_num_rows($result2);
if ($count == 1) {
echo "1";
} else if ($count2 == 1) {
$row = mysql_fetch_array($result2) or die(mysql_error());
echo $row['nama'];
} else {
echo "ID Kurir tidak di temukan";
}
my problem is when response from checkdata = "ID Kurir tidak di temukan", ajax not showing alert and stop update field nolaporan and nama kurir
$('#nolaporan').val(idkurir + today_date);
$('#namakurir').val(response);
in my script above when reponse "ID Kurir tidak di temukan" still update field nolaporan and namakurir.

Answer 1

You can fix it on the client side using $.trim() like below:
if($.trim(response) == 'ID Kurir tidak di temukan') {
//do your code
}