Ajax is not responding on remote server for Some PC's - php

Question

*Ajax is not responding on remote server for Some PC's but working fine on mobile browsers and on PC which i have uploaded on. Please let me know whats the problem with that
This Ajax function.
<pre>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#selTrim').change(function(){
var trim_id1 = $(this).val();
if(trim_id1){
$.ajax({
type:'POST',
url:'<?= base_url();?>H1_specifications/h1_trim_detail',
data:'trim_id1='+trim_id1,
success:function(data){
$('#specContWrap').html(data);
}
});
}
});
});
</script>
</pre>
*This Php Code-igniter Controller response *.
I am using Code-igniter framework please also let me know is this a best practice to echo response .
<pre>
public function h1_trim_detail(){
$id = $_POST['trim_id1'];
if(isset($_POST['trim_id1']) !== NULL){
$this->load->model('Admin_panel');
$rows7 =$this->Admin_panel->select_h1_details_specification($id);
$rows =$this->Admin_panel->select_h1_Cargo($id);
$rows1 =$this->Admin_panel->select_h1_engine($id);
$rows2 =$this->Admin_panel->select_h1_exterior($id);
$rows3 =$this->Admin_panel->select_h1_feul_comsuption($id);
$rows4 =$this->Admin_panel->select_h1_weight($id);
$rows5 =$this->Admin_panel->select_h1_wheels($id);
$rows6 =$this->Admin_panel->select_h1_transmission($id);
echo "<div id='specContWrap'>";
if($rows7 !== false){
echo "<div id='overViewWrap' class='overViewTableCon'>";
echo "<div class='overViewTable on'>";
echo "<div class='tit'>Overview</div>";
echo "<table class='infoTableType'>";
echo "<caption>Overview Table</caption>";
echo "<tbody>";
echo "<tr>";
echo "<th scope='row'>Product label</th>";
echo "<td>Commercial</td>";
echo "</tr>";
foreach($rows7 as $row){
echo "<tr>";
echo "<th scope='row'>Product label</th>";
echo "<td>".$row['name']."</td>";
echo "</tr>";
echo "<tr>";
echo "<th scope='row'>Model name</th>";
echo "<td>". $row['name_car']."</td>";
echo "</tr>";
echo "<tr>";
echo "<th scope='row'>Seats</th>";
echo "<td>". $row['seats']."</td>";
echo "</tr>";
}
echo "</tbody>";
echo "</table>";
echo "</div>";
echo "</div>";
}else{
echo "Not Found";
}
echo "<div class='togListWrap small sepcListWrap' id='overviewh1'>";
echo "<div class='togList'>";
echo "<button class='btnOpenClose'>Performance</button>";
echo "<div class='togCont' id='performanceWrap'>";
echo "<div class='performance on'>";
if($rows1 !== false){
echo "<dl class='specList'>";
echo "<dt>Engine Specification</dt>";
foreach($rows1 as $row){
echo "<dd>";
echo "<dl>";
echo "<dt>".$row['label']."</dt>";
echo "<dd>".$row['descriptions']."</dd>";
echo "</dl>";
echo "</dd>";
}
echo "</dl><br>";
}else{
echo "<dt>Engine Specification Not Found</dt><br>";
}
if($rows3 !== false){
echo "<dl class='specList'>";
echo "<dt>Feul Comsuption Specification</dt>";
foreach($rows3 as $row){
echo "<dd>";
echo "<dl>";
echo "<dt>".$row['label']."</dt>";
echo "<dd>".$row['description']."</dd>";
echo "</dl>";
echo "</dd>";
}
echo "</dl><br>";
}else{
echo "<dt>Feul Comsuption Specification Not Found</dt><br>";
}
if($rows6 !== false){
echo "<dl class='specList'>";
echo "<dt>Transmission Specification</dt>";
foreach($rows6 as $row){
echo "<dd>";
echo "<dl>";
echo "<dt>".$row['label']."</dt>";
echo "<dd>".$row['description']."</dd>";
echo "</dl>";
echo "</dd>";
}
echo "</dl><br>";
}else{
echo "<dt>Transmission Specification Not Found</dt><br>";
}
echo "</div>";
echo "</div>";
echo "</div>";
echo "<div class='togList'>";
echo "<button class='btnOpenClose'>Dimension</button>";
echo "<div class='togCont' id='DimensionWrap'>";
echo "<div class='Dimension on'>";
if($rows2 !== false){
echo "<dl class='specList'>";
echo "<dt>Exterior Specification</dt>";
foreach($rows2 as $row){
echo "<dd>";
echo "<dl>";
echo "<dt>".$row['label']."</dt>";
echo "<dd>".$row['descriptions']."</dd>";
echo "</dl>";
echo "</dd>";
}
echo "</dl><br>";
}else{
echo "<dt>Exterior Specification Not Found</dt><br>";
}
if($rows4 !== false){
echo "<dl class='specList'>";
echo "<dt>Weight Specification</dt>";
foreach($rows4 as $row){
echo "<dd>";
echo "<dl>";
echo "<dt>".$row['label']."</dt>";
echo "<dd>".$row['description']."</dd>";
echo "</dl>";
echo "</dd><br>";
}
echo "</dl><br>";
}else{
echo "<dt>Weight Specification Not Found</dt><br>";
}
if($rows !== false){
echo "<dl class='specList'>";
echo "<dt>Cargo Specification</dt>";
foreach($rows as $row){
echo "<dd>";
echo "<dl>";
echo "<dt>".$row['label']."</dt>";
echo "<dd>".$row['description']."</dd>";
echo "</dl>";
echo "</dd>";
}
echo "</dl><br>";
}else{
echo "<dt>Cargo Specification Not Found</dt><br>";
}
echo "</div>";
echo "</div>";
echo "</div>";
echo "<div class='togList'>";
echo "<button class='btnOpenClose'>Wheels</button>";
echo "<div class='togCont' id='WheelsWrap'>";
echo "<div class='Wheels on'>";
if($rows5 !== false){
echo "<dl class='specList'>";
echo "<dt>Wheels Specification</dt>";
foreach($rows5 as $row){
echo "<dd>";
echo "<dl>";
echo "<dt>".$row['label']."</dt>";
echo "<dd>".$row['descriptions']."</dd>";
echo "</dl>";
echo "</dd>";
}
echo "</dl><br>";
}else{
echo "<dt>Wheels Specification Not Found</dt><br>";
}
echo "</div>";
echo "</div>";
echo "</div>";
echo "</div>";
echo "</div>";
}
}
</pre>