Form FLIP-FLOP

[dimik2]

Hi guys

 

I have an input form related problem, I simplyfy it by just showing an example with 1 field.

So there is a panel where the user can enter certain informations eg name, birth, address etc and

he can preview all the entered information (as many times he likes) just like a comment editor.

Every time he pushes the preview button a preview will be generated on the bottom of the page.

In order to not to reset out all the fields what he entered I store the data in session variables.

If he modifies the field again the session variable will be updated.

 

Here is a snippet about how did I implement this:

 

echo '<form method="post" enctype="multipart/form-data" action="'.$_SERVER['PHP_SELF'].'">';

echo '<br><input name="data1" size="50" value="'.$_SESSION['data1'].'"><br>';

echo '<br><input type="submit" name="prv" value="Preview">';

echo '</form>';

 

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

{

    if (strcmp($_SESSION['data1'], $_POST['data1']) != 0 ) $_SESSION['data1']  = $_POST['data1'];

    $data1  = $_SESSION['data1'];

    ...

    validate input data

    ...

}

 

 

The problem is that this doesn't behaves as it expected. Once the user hits the preview button it shows the output right

but for next time all the forms are empty, after that it's right again. It acts like it would store down everything twice. If I fill out the empty forms

their content is saved too.

 

[JakeJ]

I avoid that problem by splitting the processing of page from the display.

[dimik2]

I still waiting for a meaningful answer for this.

There must be something what I do wrong here.

 

[kenrbnsn]

We need to see more of your code. Please put the tags

around your code.

 

Ken

[GoneNowBye]

also store the session in <input type="hidden" value=[here] name="this" /> at least.

[dimik2]

also store the session in <input type="hidden" value=[here] name="this" /> at least.

 

I'm sorry but why would I do this? That's the whole point to refresh the  data in the input forms all the time so the user can modify it.

Just like in this forum where you would change the subject field from "Re: Form FLIP-FLOP" "Re: Form FLIP-FLOP 2" when you reply.

[dimik2]

Well you asked for the full code but that's pretty much enough code to demonstrate whats going on. Let me make it full for ya:

 

<?php
  session_start();

      echo '<form method="post" enctype="multipart/form-data" action="'.$_SERVER['PHP_SELF'].'">';
      echo '<br><input name="data1" size="50" value="'.$_SESSION['data1'].'"><br>';
      echo '<br><input type="submit" name="prv" value="Preview">';
      echo '</form>';

   if (isset($_POST['prv']))
   {
       if (strcmp($_SESSION['data1'], $_POST['data1']) != 0 )    $_SESSION['data1']   = $_POST['data1'];
       $data1  = $_SESSION['data1'];
   }

?>

 

This will perfectly demonstrates whats going on.

[kenrbnsn]

This works right:

<?php
  session_start();
   if (isset($_POST['prv']))
   {
       if (strcmp($_SESSION['data1'], $_POST['data1']) != 0 )    $_SESSION['data1']   = $_POST['data1'];
       $data1  = $_SESSION['data1'];
   }

      echo '<form method="post" action="">';
      echo '<br><input name="data1" size="50" value="'.$_SESSION['data1'].'"><br>';
      echo '<br><input type="submit" name="prv" value="Preview">';
      echo '</form>';
?>

 

I moved the processing before the form display. Also, you don't need enctype="multipart/form-data".

 

Ken

[ignace]

<form method="POST" action="#">
<input name="data1" size="50" value="<?php print isset($_POST['data1']) ? $_POST['data1'] : '' ?>">
<input type="submit" name="prv" value="Preview">
</form>

<?php

if (isset($_POST['Preview'])) {
  echo '<div style="width: 500px; height: 500px; overflow: scroll">', applyTemplate($_POST['data1']), '</div>';
}

if (isset($_POST['submit'])) {
  //submit
}

 

You don't need session's to create a preview just make sure to auto-populate the form fields.

[dimik2]

Thanks its solved. It's really about that the php code has to come first even tho I not fully understand why.