How to display a message on the same page if a form is submitted

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I have a php page which contains a form with a text box and a submit button, i want to display any message if someone enters 'hello' in the textbox and submits it. I have made a similar page with both php and html on the same page, but when i load the php page, it shows the hello message as the page loads and i want it to display it then i submit the form. Following is my code.

PHP

if($_POST['txt'] == 'hi')
{
echo helo;	
}
else 
echo what;

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
<form action="this.php" method="post">
<input type="text" name="txt" value="" />
<input type="submit" value="submit" />
</body>
</html>

This page displays the 'what' message as the page loads which i don't want to load first. Both php and html code is on the same page

Posted 11-Aug-11 2:54am

qshah

Updated 11-Aug-11 2:57am

v4

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reid0588 11-Aug-11 9:17am

can you not put a label onto your page. the "pseudo" code would be something like

on button.click

label.text=textbox.text

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-08-13T12:32:00

There is a number of ways to do it. You simply need to tell the page loaded before post and as a result of the post. Of course what you write displays "what" as $_POST["txt"] returns empty string — look at your HTML.

One very simple method would be using different URLs — with URL query string. Suppose your page URL is "http://mydomain.org/this.php". In your form, use:

HTML

<form action="this.php?posted" method="post">

Now you can tell the posted form page a from the same page loaded using original URL:

if (QUERY_STRING == 'posted')
   echo "Thank you for posting your information";
else
   echo "Hello! Please fill in your data and press 'Post'";

—SA

a.mohammedowais · Accepted Answer · 2011-08-16T04:16:00

First this is the code u informed in the HTML

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
 
<body>
<form action="this.php" method="post">
<input type="text" name="txt" value="" />
<input type="submit" value="submit" />
</form></body>
</html>

This is the php Code of this.php

PHP

if(isset($_POST['txt'])) { ?>
<html>
<body>
Your message has been sucessfully submitted Thanks.
</body>
</html>



<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
 
<body>
<form action="this.php" method="post">
<input type="text" name="txt" value="" />
<input type="submit" value="submit" />
</form></body>
</html>

Explain

The

PHP

if(isset($_POST['txt']))

checks whether the txt is submitted if yes then show the block inside the if statement else shows the else statement

This was just a simple explanaion!!

How to display a message on the same page if a form is submitted

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