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Retaining text box value of a form after posting |
Learn details on retaining post back values of a form here
Here is one text box inside a PHP code area. We will learn here how to retain the text box value after the form is submitted. In this text box we will keep one value option which will store the value entered by the user. This form is submitting to another page where the PHP code will check the value and if it is correct then it will redirect ( or back ) to main page with the value of data in query string. We will use PHP header redirect in the second page ( page to which form data will be submitted ) to post back the data to the main page having the form.
Here to take care of some characters like & we have used urlencode and urldecode to first encode the date before sending through the address bar and then after receiving at main page again we will decode it to get the original data entered by the visitor.
Here is the code of the form with decode script.
<?
$t1v=$_GET['t1v'];
$t1v=urldecode($t1v);
echo "
<form method=post action=pb-t.php>
<input type=text name=t1 value='$t1v'>
<input type=submit value=Submit>
";
?>
Now we will go to the second page were the form date is collected and posted back to main page. Here is the code of pb-text.php
<?
$t1=$_POST['t1'];
$t1=urlencode($t1);
header ("Location: pb-text.php?t1v=$t1");
?>
Here is the demo of the script. Enter your name below this text box.
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