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Entered Fields should not be cleared with alert box is displayed in php

I am trying to display a message if the amount entered greater than 5000 alert box or echo messsage "Enter a pan card no" as to be displayed when I click on submit button. In my code Message gets displayed but all the fields which data has been already entered gets cleared. I dont want the data which is entered to get cleared.
Here is the code.
<?php
include_once "db.php";
if(isset($_POST['submit'])) {
$amount = mysql_real_escape_string($_POST["amount"]);
$firstname=mysql_real_escape_string($_POST["firstname"]);
$phone=mysql_real_escape_string($_POST["phone"]);
$address=mysql_real_escape_string(stripslashes($_POST["address"]));
$pan=mysql_real_escape_string(stripslashes($_POST["pan"]));
$query= mysql_query("INSERT INTO payment (amount,selector1,firstname,lastname,email,phone,address,country,state,pan)VALUES('$amount','$selector1','$firstname','$lastname','$email','$phone','$address','$country','$state','$pan') ") or die(mysql_error());
if($amount>="5000")
{
echo "Enter Pan Card No";
}
else {
$id=mysql_insert_id();
$_SESSION['sess_user'] = $id;
$_SESSION['lastname'] = $lastname;
$_SESSION['address']=$address;
header("Location:successreg.php");
}
}
?>
<form action="" method="post" name="payment">
<div class="w3l-user">
<input type="text" name="amount" placeholder="₹ My Contribution" required="">
</div>
<input type="text" name="firstname" placeholder="Firstname" required="">
<input type="text" name="pan" placeholder="Pan Card No" >
</div>
<div class="btn">
<input type="submit" name="submit" value="REGISTER"/>
</div>
</div>
<div class="clear"></div>
</form>
</div>
</div>

In order to show values, after for submission you should get values from $_POST and use them in input values:
$firstname = '';
if(isset($_POST['submit'])) {
// write below line after `if`
$firstname = $_POST['firstname'];
Now, change your HTML to:
<input type="text" name="firstname" placeholder="Firstname" required="" value="<?php echo $firstname; ?>">
For Radio buttons:
$firstRadio = $secondRadio = '';
if(isset($_POST['submit'])) {
// if first radio is selected which you will know from $_POST['firstRadio']
$firstRadio = 'selected';
And in HTML:
<input type='radio' <?php echo $firstRadio;?> value=1 name='firstRadio' />

Form submit in jquery dialog box not working

In the following code, both buttons of dialog box is meant to submit form. But its not submitting when buttons from dialog are clicked. If user chose yes we need to send a value to the posting page. please help me with this.
<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post" name="edit_billto" id="edit_billto">
<input type="hidden" name="option" value="com_phpshop" />
<input type="hidden" name="page" value="<?php echo $next_page; ?>" />
<input type="hidden" name="next_page" value="<?php echo $next_page; ?>" />
<input type="hidden" name="Itemid" value="<?php echo $Itemid; ?>" />
<input type="hidden" name="autoship_flag" id="autoship_flag" value="0">
<input type="submit" id="bill_sumbit" class="button" name="submit" value="<? echo _E_SAVE ?>" <? echo $submit; ?> />
</form>
Jquery part
<div id ="alert" style="display:none"> <p> This address is used in autoship.
You need to change the address in autoship too?
</p></div>
<script>
$(document).ready(function() {
$("#alert").dialog({autoOpen: false,
modal: true,
buttons: {
No : function(){
isconfirm = true;
//$("form[name='edit billto']").unbind('submit');
$("#edit_billto").submit();
$(this).dialog("close");
//$("form[name='edit billto']").unbind('submit').submit();
},
Yes: save_info
},
resizable: true,
height: "auto",
width: "auto",
closeOnEscape: false,
title: "Autoship Update"
});
});
var isconfirm = false;
$( "form[name='edit_billto']" ).submit(function(e) {
//alert(isconfirm);
if(isconfirm === true){
return true;
}
if(isconfirm === false){
e.preventDefault();
$( "#alert" ).dialog( "open" );
}
});
function save_info(){
isconfirm = true;
$("#autoship_flag").val("1");
$("form[name='edit_billto']").unbind('submit');
$("form[name='edit_billto']").submit();
}
</script>

Not sure why, you're .submit() isn't working but you could try .trigger('click')
Something like this should work:
No : function(){
$("form[name='edit_billto']").off('submit');
$("#bill_sumbit").trigger('click');
}
,

checked term and condition before submit form

if user want to submit their form, they have to checked the terma and condition box first.
so where should i add the code?
<?php
// Start the session
session_start();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>Page Title Goes Here</title>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="form1.css"/>
</head>
<body onload="disableSubmit()">
<?php
//define variable and set to empty value
$forenameErr = $surnameErr = $emailErr = $postalAddressErr = $landLineTelNoErr = $mobileTelNoErr = $sendMethodErr = "";
$valid = true;
// if forename is null , make it null , else test_input()
$forename = empty($_POST["forename"]) ? NULL : test_input($_POST["forename"]);
// if surname is null , make it null , else test_input()
$surname = empty($_POST["surname"]) ? NULL : test_input($_POST["surname"]);
// if postalAddress is null , make it null , else test_input()
$postalAddress = empty($_POST["postalAddress"]) ? NULL : test_input($_POST["postalAddress"]);
// if landLineTelNo is null , make it null , else test_input()
$landLineTelNo = empty($_POST["landLineTelNo"]) ? NULL : test_input($_POST["landLineTelNo"]);
// if mobileTelNo is null , make it null , else test_input()
$mobileTelNo = empty($_POST["mobileTelNo"]) ? NULL : test_input($_POST["mobileTelNo"]);
//email
$email = empty($_POST["email"]) ? NULL : test_input($_POST["email"]);
// if sendMethod is null , make it null , else test_input()
$sendMethod = empty($_POST["sendMethod"]) ? NULL : test_input($_POST["sendMethod"]);
if (isset($_POST["submit"])){
//check forename
if($forename === NULL) {
//forename is empty
$forenameErr = "*Forename is required";
$valid = false;
} else {
//check characters
if (!preg_match("/^[a-zA-Z ]*$/",$forename)) {
$forenameErr = "Only letters and white space allowed";
$valid = false;
}
}
//check surname
if($surname === NULL){
//surname is empty
$surnameErr = "*Surname is required";
$valid = false; //false
} else {
//check charaters
if (!preg_match("/^[a-zA-Z ]*$/",$surname)) {
$surnameErr = "*Only letters and white space allowed";
$valid = false;
}
}
//check address
if (!preg_match("/^[a-zA-Z0-9\-\\,. ]*$/", $postalAddress)) {
// check characters
$postalAddressErr = "*Invalid Postal Address";
$valid = false;//false
}
// check if invalid telephone number added
if (!preg_match("/^$|^[0-9]{12}$/",$landLineTelNo)) {
//check number
$landLineTelNoErr = "*Only 12 digit number can be entered";
$valid = false;//false
}
//check valid mobiel tel no
if (!preg_match("/^$|^[0-9]{11}$/",$mobileTelNo)) {
//check number
$mobileTelNoErr = "*Only 11 digit number can be entered";
$valid = false;//false
}
//check valid email
if (isset($email) && !filter_var($email, FILTER_VALIDATE_EMAIL))
{ $emailErr = "*Invalid email format";
$valid = false;//false
}
//check sendMethod
if($sendMethod === NULL){
//send method is empty
$sendMethodErr = "*Contact method is required";
$valid = false; //false
} else {
$sendMethod = test_input($_POST["sendMethod"]);
}
//sendmethod link to information filled
if (isset($sendMethod) && $sendMethod=="email" && $email ==NULL){
$emailErr ="*Email is required ";
$valid = false;
}
if (isset($sendMethod) && $sendMethod=="post" && $postalAddress ==NULL){
$postalAddressErr ="*Postal Address is required ";
$valid = false;
}
if (isset($sendMethod) && $sendMethod=="SMS" && $mobileTelNo ==NULL){
$mobileTelNoErr ="*Mobile number is required ";
$valid = false;
}
//if valid then redirect
if($valid){
$_SESSION['forename'] = $forename;
$_SESSION['surname'] = $surname;
$_SESSION['email'] = $email;
$_SESSION['postalAddress'] = $postalAddress;
$_SESSION['landLineTelNo'] = $landLineTelNo;
$_SESSION['mobileTelNo'] = $mobileTelNo;
$_SESSION['sendMethod'] = $sendMethod;
header('Location: userdetail.php');
exit();
}
} else{
//user did not submit form!
}
//check
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<div id="wrapper">
<h1>Welcome to Chollerton Tearoom! </h1>
<nav>
<ul>
<li>Home</li>
<li>Find out more</li>
<li>Offer</li>
<li>Credit</li>
<li>Admin</li>
<li>WireFrame</li>
</ul>
</nav>
<form id = "userdetail" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="POST">
<fieldset id="aboutyou">
<legend id="legendauto">user information</legend>
<p>
<label for="forename">Forename: </label>
<input type="text" name="forename" id="forename" value="<?php echo $forename;?>">
<span class="error"> <?php echo $forenameErr;?></span>
</p>
<p>
<label for="surname">Surname:</label>
<input type="text" name="surname" id="surname" value="<?php echo $surname;?>">
<span class="error"> <?php echo $surnameErr;?></span>
</p>
<p>
<label for="postalAddress">Postal Address:</label>
<input type="text" name="postalAddress" id="postalAddress" value="<?php echo $postalAddress;?>">
<span class="error"> <?php echo $postalAddressErr;?></span>
</p>
<p>
<label for="landLineTelNo">Landline Telephone Number:</label>
<input type="text" name="landLineTelNo" id="landLineTelNo" value="<?php echo $landLineTelNo;?>" >
<span class="error"> <?php echo $landLineTelNoErr;?></span>
</p>
<p>
<label for="mobileTelNo">Moblie:</label>
<input type="text" name="mobileTelNo" id="mobileTelNo" value="<?php echo $mobileTelNo;?>" >
<span class="error"> <?php echo $mobileTelNoErr;?></span>
</p>
<p>
<label for="email">E-mail:</label>
<input type="text" name="email" id="email" value="<?php echo $email;?>">
<span class="error"> </span> <?php echo $emailErr;?> </span>
</p>
<fieldset id="future">
<legend>Lastest news</legend>
<p>
Choose the method you recommanded to recevive the lastest information
</p>
<br>
<input type="radio" name="sendMethod" id="sendMethod" <?php if (isset($sendMethod) && $sendMethod=="email") echo "checked";?> value="email">
Email
<input type="radio" name="sendMethod" id="sendMethod" <?php if (isset($sendMethod) && $sendMethod=="post") echo "checked";?> value="post">
Post
<input type="radio" name="sendMethod" id="sendMethod" <?php if (isset($sendMethod) && $sendMethod=="SMS") echo "checked";?> value="SMS">
SMS
<span class="error"> <?php echo $sendMethodErr;?></span>
</fieldset>
<p><span class="error">* required field.</span></p>
<input type="checkbox" name="terms" id="terms">
I have read and agree to the Terms and Conditions and Privacy Policy
<br><br>
<p>
<input type="submit" name="submit" value="submit" />
</p>
</form>
</form>
</fieldset>
</form>
</div>
</body>
</html>
and so here is my userdetail.php to get user data...
<?php
session_start();
$forename = $_SESSION['forename'];
$surname = $_SESSION['surname'];
$email = $_SESSION['email'];
$postalAddress = $_SESSION['postalAddress'];
$landLineTelNo = $_SESSION['landLineTelNo'];
$mobileTelNo = $_SESSION['mobileTelNo'];
$sendMethod = $_SESSION['sendMethod'];
echo "<h1>Successfull submission :</h1>";
echo "<p>Forename : $forename <p/>";
echo "<p>Surname : $surname <p/>";
if($_SESSION['postalAddress']==NULL)
{echo "<p>postalAddress:NULL</p>";}
else {echo "<p>PostalAddress : $postalAddress </p>";}
if($_SESSION['email']==NULL)
{echo "<p>email:NULL<p/>";}
else {echo "<p>email : $email</p>";}
if($_SESSION['landLineTelNo']==NULL)
{echo "<p>landLineTelNo:NULL<p/>";}
else {echo "<p>landLineTelNo : $landLineTelNo </p>";}
if($_SESSION['mobileTelNo']==NULL)
{echo "<p>mobileTelNo:NULL<p/>";}
else {echo "<p>mobileTelNo : $mobileTelNo </p>";}
echo "<p>sendMethod : $sendMethod </p>";
?>
i need the term and condition check box to be checked else use cannot submit the form....

REMEMBER! Using javascript will just make it easy for user.It prevents loading another page to display error. STILL if a browser has javascript turned of it will pass the checked Terms without even checking it. so you should Always check it serverside (PHP) and use javascript for users ease.
in your HTML:
<form id="userdetail" ....>
...
<input type="checkbox" name="terms" id="terms" value="accepted" />
...
</form>
then in your javascript:
Pure JS:
document.getElementById('userdetail').addEventListener('submit', function(event){
if(document.getElementById('terms').checked == false){
event.preventDefault();
alert("By signing up, you must accept our terms and conditions!");
return false;
}
});
Using JQuery (jquery.com)
$('#userdetail').submit(function(event){
if($('#terms').is(':checked') == false){
event.preventDefault();
alert("By signing up, you must accept our terms and conditions!");
return false;
}
});
and in your PHP to check if it is checked you should use
if(isset($_POST['terms']) && $_POST['terms'] == 'accepted') {
// Continue Registring
} else {
// Display Error
}

Instead of submit you do:
<input type="button" onclick="javascript:myFunction()" Value="Submit">
And then the javascript function:
function myFunction() {
if(document.getElementById("terms").checked == true){
document.getElementById("userdetail").submit();
}
else{
alert("You have to agree on terms and conditions");
}
}

In Jquery you can do like below:
<script>
$('#userdetail').submit(function(){
if($('#terms').is(':checked'))
{
return true;
}
else
{
return false;
}
});
</script>

Replace the part of html with the given html in answer and add the function below to you script...
function verify_terms()
{
if (!$('#terms').is(':checked'))
{
alert('Please agree terms and conditions');
return false;
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<input type="checkbox" name="terms" id="terms">
I have read and agree to the Terms and Conditions and Privacy Policy
<br><br>
<p>
<input type="submit" name="submit" onclick="return verify_terms();" value="submit" />

Getting form field values in php and then disabling it

i am using form in my page like this
<form method='post' action='' class='myform'>
<input type='text' name='name'>
<input type='text' name='email'>
<input class='btn' type='submit' name='submit' >
</form>
what i want i will get the values of form and then disable all its fields , now this is my code to disable all fields when form is submitted
$(document).on('click', '.btn', function(event) {
var currentForm = $(this).closest('form');
currentForm.find('input').prop('disabled', true);
});
and before this i'm trying to get values from $_POST like this
if(isset($_POST["submit"])){
$name= $_POST["name"];
$email= $_POST["email"];
}
but problem is that as i press submit button fields get disabled and i dont get any posted values , how do i get values first and then disable fields ?

Your mistake - You are disabling the input field by
currentForm.find('input').prop('disabled', true);
So when you submit the form, the field will be in disabled state and will not be posted.
Solution - please change the line to
currentForm.find('input').prop('readonly', true);

look this example or try with it....
if(isset($_POST["submit"]))
{
$name= $_POST["name"];
$email= $_POST["email"];
}
?>
<form method='post' action='' class='myform'>
<?php
if($name != '' && $email != '')
{
?>
<input type='hidden' name='name' value="<?php echo $name?>">
<input type='hidden' name='email' value="<?php echo $email?>">
<?php
}
?>
<input type='text' name="<?php echo ($name != ''?'hidden_name':'name')?>" <?php echo ($name != ''?'disabled':'')?> value="<?php echo $name?>">
<input type='text' name='<?php echo ($email != ''?'hidden_email':'email')?>' <?php echo ($email != ''?'disabled':'')?> value="<?php echo $email?>">
<input class='btn' type='submit' name='submit' >
</form>

You can use ajax for that like this:
$('.btn').bind('click', function() {
$.ajax({
url: "your page url here",
type: 'POST',
async:false,
success: function(response) {
$('input').prop('disabled', true);
}
});
});

you don't pass submit parameter to formdata, that's why you can't get it.
try this
<?php if(isset($_POST['name'])){ echo $_POST['name'] }?>

How to check if an entered value is 10 javascript?

I want to check if an entered value is 10 or not(and if the value is 10, I want the result to be sent to "send.php"). What am I doing wrong?
<?php $cod1=rand(0, 10);
$cod2=10-$cod1; ?>
<form action='send.php' method='post' onsubmit='f1(this)'>
Please enter the value of <br> <?php echo $cod1 ?> + <?php echo $cod2 ?> in the following box
<input type="text" name="xrezultat" id="xrezultat" class="box" size="32"/>
<input name="Submit1" type="submit" class="butt" value="Trimiteti">
<input name="Submit2" type="reset" class="butt" value="Stergeti ">
</form>
<Script>
function f1(input)
{
if(document.getElementById("xrezultat").value!=10)
aux==false;
if (aux == true)
{
return true;
}
else
{
alert ( "Please enter the correct value" );
return false;
}
}
</script>

aux==false; checks to see if aux is equal to false, it does not assign to it.
It should read aux=false;.

Try using parseInt.
var numberValue = parseInt(document.getElementById("xrezultat").value, 10);