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Mugur_Ungureanu
Currently Being Moderated

Using onChange behavior

Dec 10, 2012 11:24 PM

Tags: #php #onchangeevent #behaviors

Hi,

I am working in Dreamweaver 5.5 on a php file.

I have a variable $username = $_SESSION['MM_Username'] and another variable: $user_asking. I want to assign the value $username to $user_asking when a Select (List/Menu) is changed, using onChange Behavior. It is possible? Thank you!

 
Replies
  • Sudarshan Thiagarajan
    4,000 posts
    Oct 15, 2010
    Currently Being Moderated
    Dec 11, 2012 12:08 AM   in reply to Mugur_Ungureanu

    Can we see your full code?

     

    -ST

     
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  • Sudarshan Thiagarajan
    4,000 posts
    Oct 15, 2010
    Currently Being Moderated
    Dec 11, 2012 12:10 AM   in reply to Sudarshan Thiagarajan

    On a sidenote, I doubt this possibility. PHP is server-side, Javascript is client-side. Unless you actually submit the form to PHP for processing and get a return value, I doubt if you can use the value within an onChange behavior.

     

    Anyway, post your code in full so we can offer more suggestions.

     

    -ST

     
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  • Sudarshan Thiagarajan
    4,000 posts
    Oct 15, 2010
    Currently Being Moderated
    Dec 11, 2012 1:07 AM   in reply to Mugur_Ungureanu

    Like I said, I don't think it is possible to do this with your PHP and JS on the same page. JS needs to post the data back to PHP for processing which happens on pageload.

     

    However, I'm moving this thread to Developing Server-side applications in DW for better responses.

     
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  • Currently Being Moderated
    Dec 17, 2012 1:50 PM   in reply to Sudarshan Thiagarajan

    I agree. You would need to write some AJAX code on the page that communicates with a separate php file. The php file could send data back to your page without reloading it. I was just working on something very similar this morning.

     

    Something like this might work for you...

     

    On the page with the select element:

    <script type="text/javascript">

    function doSomethingOnServer(){

         if(window.XMLHttpRequest){

              //code for IE7+, Firefox, Chrome, Safari

              xmlhttp = new XMLHttpRequest();

         }

         else{

               xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

         }

          xmlhttp.onreadystatechange = function(){

              if(xmlhttp.readyState == 4 && xmlhttp.status == 200){

                   document.getElementById("my_paragraph").innerHTML = xmlhttp.responseText;

              }

         }

         xmlhttp.open("GET", "do-something.php, true);

         xmlhttp.send();

    }

    </script>

    <select id = "my_select" onChange = "doSomethingOnServer()">...</select>

    <p id="my_paragraph"></p>

     

    On a separate php file named do-something.php:

    <?php

         //do something

         $user_asking = $username;

         echo("Write out data that you want to sent back as responseText here. i.e., user asking = $user_asking");

    ?>

     
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  • Currently Being Moderated
    Dec 18, 2012 9:49 AM   in reply to Mugur_Ungureanu

    Sudarshan and geotrice are correct, but what is not clear is what you are trying to accomplish - it's not making sense to me.  The server side script has already completed execution by the time the user is interacting with the list/menu, so what's the point of changing the value of a variable at that point? What do you plan to do with that value? What is the workflow after the user interacts with the list/menu?

     
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