Generate & Process Form on same page with HTML table

[warriorwomen]

Hi
I am just starting out with PHP, and have set myself the task of recreating a simple version of this page http://www.runningforfitness.org/calc/convert.php

I have managed to write the code that takes the user input and displays the processed results on a different page but I really want the form generation and processing to occur on the same page.

I believe I need to have the form action pointing to the page in which it appears and then when the submit button is pressed for some php code to step in and generate the results table.

I want my results to be displayed within a HTML table so how do I write the code within a php block?
If I simply write the HTML code inside the PHP nothing happens.

If anyone does something similar to this I would be grateful if you could post the code for me to try and unscramble.

The trouble when you are just learning is that its very difficult to know what help you need and how to ask for it - so sorry if this is not clear.

[danman]

Hi,dont know exactly if this is what you look for, but the principle works:

<?php

if($_POST['submit']){ // if submit is pressed (button named 'submit')

print '<table>ztr><td>some data...';

}

?>

[Dan Grossman]

That condition is insufficient and ambiguous. It relies on the value of the submit button evaluating to true, throws notices if not (accessing a key that may not be in the array), and the submit button is not sent by all browsers, including IE when you press enter instead of clicking the button to submit.

Test for a non-empty value in one of the required fields, or create a hidden field indicating the form was submitted (guaranteed to have a value), or test if the entire $_POST array is empty.

[Egyptechno]

<?php
if($_POST['logme']){
if(!empty($_POST['username']) AND !empty($_POST['pass'])){
echo "Your Are Logged $_POST[username] ";
}else{
echo "You have to fill out the two fields !";
}
}else{
?>
<form method="post">
Username : <input type="text" name="username" />
Password: <input type="password" name="pass" />
<br/>
<input type="submit" name="logme" value="Login" />
</form>
<?php
}

hope that helps !

[warriorwomen]

Thanks for all the responses.

I have now managed to get php to generate a html form - thanks danman.
I am now having problems actually utilising one of the variables within the table. In the following code I got an parse error, unexpected T_string on the line starting <td>echo $_GET...... from the colour coding applied by dreamweaver it appears that the "echo $GET" bit is not recognised as code at all.

<?php
if($_GET['speedsubmit']){ // if submit is pressed)
print '<table width="50%" border="0">
<tr>
<td><p>put php var here</p></td>
<td>echo $_GET['min']</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
</table>';
}
else {
echo "do nothing yet";
}
?>

Dan Grossman - I get your point about the use of a hidden field, I will definately move onto that when I get my form issues sorted.

[danman]

That condition is insufficient and ambiguous. It relies on the value of the submit button evaluating to true, throws notices if not (accessing a key that may not be in the array), and the submit button is not sent by all browsers, including IE when you press enter instead of clicking the button to submit.

Pressing enter only submits the form if it there is one field in it?
Well maybe it is not sent if you tab to the submit button and press enter either,hmm guess I should change the way I do that.

[Dan Grossman]

Thanks for all the responses.

I have now managed to get php to generate a html form - thanks danman.
I am now having problems actually utilising one of the variables within the table. In the following code I got an parse error, unexpected T_string on the line starting <td>echo $_GET...... from the colour coding applied by dreamweaver it appears that the "echo $GET" bit is not recognised as code at all.

Because the code is not correct. You're still inside a print statement there, it would print the word "echo" if the single quote after that didn't terminate the string being "print"ed and then end the statement without a semicolon.

<?php if (isset($_GET['speedsubmit'])) { ?>
      <table width="50%"  border="0">
        <tr>
          <td><p>put php var here</p></td>
          <td><?php echo $_GET['min']; ?></td>
        </tr>
        <tr>
          <td>&nbsp;</td>
          <td>&nbsp;</td>
        </tr>
      </table>
<?php 
} else {
  echo "Do nothing yet.";
}
?>

[warriorwomen]

Aha!
Thank you very much for helping out there.
I will learn to write my own code eventually!