<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script><script>
function sendContact(id) {
if(!$("#userName_"+id).val()) {
$("#userName_"+id).focus();
alert('Enter the First Name');
valid = false;
}
return valid;
}
</script>
</head>
<body>
<?php
$i=1;
while($i<5){
?>
<div>
<label>Name</label>
<input type="text" name="userName" id="userName_<?php echo $i; ?>" >
<input type="submit" name="submit" value="submit" onClick="sendContact(<?php echo $i; ?>);">
<?php $i++; } ?>
function sendContact(id) {
if(!$("#userName_"+id).val()) {
$("#userName_"+id).focus();
alert('Enter the First Name');
valid = false;
}
return valid;
}
</script>
</head>
<body>
<?php
$i=1;
while($i<5){
?>
<div>
<label>Name</label>
<input type="text" name="userName" id="userName_<?php echo $i; ?>" >
<input type="submit" name="submit" value="submit" onClick="sendContact(<?php echo $i; ?>);">
<?php $i++; } ?>
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