how do i get back textbox value after form submit - php

Question

i want to get back or post back textbox value after form has been submit it is necessary because of user's must be see what values he or her typed in the textbox?
function getComboA(sel) {
var cname=document.getElementById("cname");
var input_val = document.getElementById("cname").value;
name.action = "searchreceivable.php?cname="+input_val+"";
name.submit();
}
<form name="name" id="name"><input class="input_field" type="text"
name="cname" id="cname" onchange="getComboA();"></form>
Now Problem is Solved This Is My Final Code So It Will Retain Textbox Value Once Form Submitted
function getComboA(sel) {
var cname=document.getElementById("cname");
var input_val = document.getElementById("cname").value;
name.action = "searchreceivable.php?cname="+input_val+"";
name.submit();
}
<form name="name" id="name"><input class="input_field" type="text"
name="cname" id="cname" onchange="getComboA();"
value="<?php echo $txtVal=$_GET['cname']; ?>"></form>

Answer 1

Do you really need it to store via javascript? Maybe you can just do something like:
<input class="input_field" type="text"
name="cname" id="cname" onchange="getComboA();" value="<?php echo $_GET['name']; ?>">

Answer 2

function getComboA(sel) {
var cname=document.getElementById("cname");
var input_val = document.getElementById("cname").value;
form.action = "searchreceivable.php?cname="+input_val;
form.submit();
}
The code is to be done on searchreceivable.php-
<?php
$txtVal=$_GET['cname'];
?>

Answer 3

Since you mark this question jQuery and you want to send data to the server onchange, then I suggest
$(function() {
$("#cname").on("change",function() {
$.get("searchreceivable.php?cname="+$(this).val(),function(data) {
$("#result").html(data);
});
});
});
using
<form>
<input id="cname" class="input_field" type="text" value=""/>
</form>
<div id="result"></div>