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Create alert in php and then remove from dom


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HI all,

I am looking for some best practice help here.

I have a php function called with AJAX and on failure, i would like it to create an alert bar on the page that fades out.

I have the know how to show the message on the page but i am doing this using a prepend.  I know that this should be handled with JS but i am not sure of the best practice to achive what i am after.

Any pointers here appreciated.

I have attached the function incase that is useful.

function showNewItemAfterBCScan($serial_number, $personId){
	include 'includes/dbconn.php';
	$out="<div id='assigningKitAlert' class='alert alert-warning'>Bar Code Incorrect</div>";

	$stmt = $conn -> prepare("
		SELECT ks.id, ks.serial, km.model_name, kf.kit_family
		from kit_serial ks 
		inner join kit_model km on ks.kit_model = km.id
		inner join kit_family kf on ks.kit_family = kf.id
		where ks.serial = ?

	$stmt -> bind_param('i', $serial_number);
	$stmt -> execute();
	$stmt -> bind_result($id, $serial, $mname, $kfamily);

	if($stmt -> fetch()){
		$out = <<<OUTPUT
		<div class='row bg-secondary m-1 center-all'>
		<div class='col-2 text-center'>
		<img class='device-thumb py-3' src='img/DP4800e-Front.png' alt=''>
		<div class='col-10'>
		<div class='row'>
		<div class='col-4'>
		<div class='col-4'>
		<div class='col-2'>

		<div class='col-2'>
		<h1>x 1</h1>
		<div class='row'>
		<div class='col-12'>
		assignKit($serial_number, $personId);
	$stmt -> close();

	return $out;



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  • Solution

You could try something like this example

   if (isset($_GET['ajax'])) {
       if (rand(0,1)) {
           exit("Bar Code Incorrect");
       else {
           exit("Everything OK");
<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>  
<script type='text/javascript'>
    $().ready( function() {
        $("#test").click( function() {
                function(resp) {
                    if (resp=="Bar Code Incorrect") {
                        let err = $("<div>", {"id":"error", "class":"alert alert-warning", "html":resp})
                    else {
<style type='text/css'>
    .alert {
        background-color: red;
        color: white;
        padding: 16px;
    <button id='test'>Test</button>
    <div id='output'></div>


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