Unique Id without submission of form in ajax php
I have a form there are 5 fields where I want to automatic generate roll number in 5th field after filling up 4 fields(Name,Phone,Course,Batch) without submitting form.but after filling up 4 field no value comes in 5th field(roll).Below is my code
index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" <head>
<title>Untitled Document</title>
<script>
function my_validate_func() {
if ($('#name').val() != "" && $('#phone').val() != "" &&
$('#course').val() != "" && $('#center').val() != "") {
$.ajax({
type: "POST",
url: 'submit.php',
success: function(response) {
$('#roll').val(response.roll);
}
});
}
}
</script>
</head>
<body>
<form method="post" action="">
<input type="text" name="name" id="name" onchange="my_validate_func()">
<input type="text" name="phone" id="phone" onchange="my_validate_func()">
<input type="text" name="course" id="course" onchange="my_validate_func()">
<input type="text" name="center" id="center" onchange="my_validate_func()">
<input type="text" name="roll" id="roll" value="<?php $roll; ?>">
</form>
</body>
</html>
**submit.php code is below**
<?php
$roll=rand(100000,999999);
echo $roll;
?>
Corrected Code,
<!DOCTYPE>
<head>
<title>Untitled Document</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script type='text/javascript'>
$( document ).ready(function() {});
function my_validate_func() {
if ($('#name').val() != "" && $('#phone').val() != "" &&
$('#course').val() != "" && $('#center').val() != "") {
$.ajax({
type: "POST",
url: 'submit.php',
success: function(response) {
$('#roll').val(response);
}
});
}
}
</script>
</head>
<body>
<form method="post" action="">
<input type="text" name="name" id="name" onchange="my_validate_func()">
<input type="text" name="phone" id="phone" onchange="my_validate_func()">
<input type="text" name="course" id="course" onchange="my_validate_func()">
<input type="text" name="center" id="center" onchange="my_validate_func()">
<input type="text" name="roll" id="roll" value="">
</form>
</body>
</html>
**submit.php code is below**
<?php
$roll=rand(100000,999999);
echo $roll;
?>
** Updated submit.php code is below**
<?php
Function getUniqueRandomNo() { $roll=rand(100000,999999); // Check in db, for example in emp_id field $id = mysql_query("select emp_id from emp_master where emp_id = '$roll'"); If($id !=null) { return getUniqueRandomNo(); } else{
Return $roll; } } echo getUniqueRandomNo(); ?> Note: I have written this recursive function code directly here, please do necessary update. There might be syntax error.
试试这个代码：
$(document).ready(function(){
//You can use keyup or change or etc.
$('input.fields').change(function() {
var check_empty = $('input.fields').filter(function(item) {
return $.trim($(this).val()).length === 0;
}).length === 0;
if(check_empty === true){
//uncomment in rell test
/*$.ajax({
type: "POST",
url: 'submit.php',
success: function(response) {
$('#roll').val(response.roll);
}
});*/
//for test
$('#roll').val(Math.random());
}
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form method="post" action="">
<input type="text" name="name" id="name" class="fields" >
<input type="text" name="phone" id="phone" class="fields">
<input type="text" name="course" id="course" class="fields">
<input type="text" name="center" id="center" class="fields">
<input type="text" name="roll" id="roll" disabled>
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