Hi,

I have a textfield i want to submit if the preg_match approves the text.

PHP Code:

if(isset($_POST['Cstring'])){
if(!preg_match("/^[a-z]$/",$_POST['Name'],$Estring)){
 echo "Error";
    } 


When typing in anything other then whats allowed i get the error msg but the form still sends the information. What am i missing or doing wrong?

I can't know without seeing the rest of your code, but it sounds like you haven't put the alternative reaction in else {} brackets.

- Steve

Well thats all code i came up with except for the form,

PHP Code:

<formaction=""  method="post" >
    <input type="text" name="Cstring" id="textfield" />
    <input type="submit" name="change" value="Change now" />
     
</form> 


How do i write a reaction for stopping form from submit the values i dont want.

So... like this?

PHP Code:


<?php
if ($_POST['change']) {
    if(!preg_match("/[a-z]/",$_POST['Cstring'],$Estring)){
        echo "Error";
    } else {
        echo "It Worked!";
    }
}
?>
  
<form method="post" >
    <input type="text" name="Cstring" />
    <input type="submit" name="change" value="Change now" />
</form>

Because I'm pretty sure that you have some more code there... and I'm not totally sure I know what you're trying to do.

- Steve

Sorry, ill try to explain better this time. Im trying to make my form return true or false depending on the preg_match. And i dont know how to do this in php.

And do you want the form to send some type of information somewhere? If not, then what I've given you ought to do the job.

- Steve

I think you have missunderstood the way php works. Unlike JavaScript, which is run in the browser and can do things without reloading the page, php is a server side language (runs on the server, not in the browser). So for any php code to be executed you have to reload the page, go to a new page, submit a form etc. Anything that will send a new request to the server so that a page is loaded.

This means, you can not have php validate your form before it is sent. Instead you must send the form, retrieve the submited data and validate it. If the data is ok then do what you intentionally wanted to do with it (send as a mail, store in a file, print some message etc.). If the data does not validate you would normally give an error message, display the form again and ask the user to fill it in properly.

And just to make it clear, evan though I wrote "So for any php code to be executed you have to reload the page", this isn't just some downside of php in perticular. This is the way all serverside languages work, hence the name serverside.