PHP writing to textbox

[Ryan_Alexander]

Hi there, I wish to write a set $var into a textbox.
 
So far, I have gotten:

<?php
    $result = "Hello world!"; //Do your logic anywhere but be sure to set the result here
?>
<form method="post" action="script.php">
....
<input type="text" value="<?= $result?>" readOnly>
<input type="submit">
</form>

 

Now, this sets my textbox to say "Hello World", however, I would like for the text box to be blank and once I have clicked my button, for the textbox to be populated with "hello world", not before.

 

Thank you for reading this.

[trq]

That would require Javascript not php.

[Ryan_Alexander]

But it works as it is, do I really need to use javascript to display the text after an action?

[ComGuar]

Yes, like Trq said.

[trq]

But it works as it is, do I really need to use javascript to display the text after an action?

Unless you want to make a request to the server yes. PHP is executed server side, long before the html appears in a users browser.

[Ryan_Alexander]

Is there any easy way of doing this? I haven't got a clue where to start

[trq]

It's pretty unclear as to what your trying to do.

 

If you only want the "Hello World" to appear in the form after it's been submitted, it kinda makes your form redundant.

<?php
    if ($_SERVER['REQUEST_METHOD'] == 'POST') {
        $result = "Hello world!";
    } else {
        $result = '';
    }
?>

<form method="post" action="script.php">
  <input type="text" value="<?= $result; ?>" readOnly>
  <input type="submit">
</form>