?
Solved

Showing Total on a Form BEFORE Submission--PHP

Posted on 2011-09-12
10
Medium Priority
?
259 Views
Last Modified: 2012-05-12
I know this is probably very simple, and I've even tried searching on google for sample solutions...however, I must not be asking the right question.

I have an entry form for a tournament, with a basic entry amount.

There is a checkbox on the form, when if checked, adds a set amount to the basic entry.

I want to show a total on at the bottom of the form BEFORE the user clicks the submit button.  Basically this would be a toggle...if the checkbox is checked, the amount goes up.  If not, it is the basic amount.

Lets say the following is true:

$basicAmount = 100.00

$scratchTeam = 40.00

$basicAmount applies to all entries.  If the checkbox with name="scratchTeam" is checked, then I want the total at the bottom to show $basicAmount + $scratchTeam.  However, I can't do that until the Submit button is clicked and the $_POST['scratchTeam'] is sent to the browser.

I'm figuring that javascript is required here.  Can someone help, or at least point me in the direction of a tutorial on the web that discusses this?
0
Comment
Question by:DennisHacker
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
10 Comments
 
LVL 15

Expert Comment

by:Insoftservice
ID: 36527316
hi,

ALGO

provide the checkbox with unique no .
on on each click call javascript function to get the value of the specific checkbox w.r.t there id.

and than add it with your basic amount
0
 
LVL 2

Expert Comment

by:artisticsoul
ID: 36527332
Everything you need can be found here
http://www.quirksmode.org/js/formex.html
0
 

Author Comment

by:DennisHacker
ID: 36527369
artisticsoul:

Did you mean the site, or the page itself that you sent me to.

If it was the site, I'll have to search.  The page you sent me to STILL REQUIRES A SUBMIT before anything happens in the text box at the bottom.  What I need on my page is for the amount the person is going to pay changes AS SOON AS THE CHECKBOX IS CHECKED.
0
Get real performance insights from real users

Key features:
- Total Pages Views and Load times
- Top Pages Viewed and Load Times
- Real Time Site Page Build Performance
- Users’ Browser and Platform Performance
- Geographic User Breakdown
- And more

 

Author Comment

by:DennisHacker
ID: 36527373
insoftservice:

I'm sorry.  I don't understand your abbreviations.

The checkbox has a unique name.  Why does it need a unique no.?
What does w.r.t. stand for?
0
 
LVL 13

Accepted Solution

by:
ansudhindra earned 2000 total points
ID: 36527393
check this..
 
<?php
  $basicAmount = 100;
  $scratchTeam = 40;
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <meta http-equiv="content-type" content="text/html; charset=windows-1250">
  <meta name="generator" content="PSPad editor, www.pspad.com">
  <title></title>
  <script type="text/javascript">
    <?php
      echo "var basicAmount = $basicAmount;";
      echo "var stAmount = $scratchTeam;";
    ?>
    function doUpdateTotal(ele){
      var totAmount=0;
      if(ele.checked){
        totAmount = basicAmount + parseInt(ele.value);
      } else {
        totAmount = basicAmount;
      }
      document.getElementById('totalAmount').innerHTML=totAmount;
    }
  </script>
  </head>
  <body>
      <?php
        echo "Basic : $basicAmount <br> ";
      ?>
      Scratch Team : <input type="checkbox" name="scteam" id="scteam" value="<?php echo $scratchTeam; ?>" onClick="javascript:doUpdateTotal(this)">
      <br>
      <b>Total :</b><span id="totalAmount"></span>
  </body>
</html>

Open in new window

0
 
LVL 15

Expert Comment

by:Insoftservice
ID: 36527400
its done with respect to (i.e w.r.t) jquery .
this is not tested please do let me know if any issue .

it will check whether the checkbox is selected if true than add or else subtract the total value.
in javascript the id should have unique value u can check that i have given cricket,footabll but not same text for id . hope its clear now

<input type="text" value="400" id="totalid" name="total">


<input type="checkbox" id="cricket" name="cricket" value='100' onclick="javascript:add('cricket');">
<input type="checkbox" id="football" name="football" value='200' onclick="javascript:add('football');">
<input type="checkbox" id="golf" name="golf" value='300' onclick="javascript:add('golf');">

<SCRIPT LANGUAGE="JavaScript">


function add(id)
{
  var total = $('#totalid').val();
  var select = $('#'+id).val();

   if($('#'+id).checked== true)
   {
      var add = total+select;
   }
   else
   {
     var add = total-select;
   }
 
  $('#totalid').val(add);
}
</script>
0
 

Author Comment

by:DennisHacker
ID: 36527411
ansudhindra:

I think we are very close here.  However, it is now 12:36 AM where I live, and I won't be able to test this and adapt it until the morning.

I will let you know.  In your example, it works exactly as I want it to work.
0
 
LVL 12

Expert Comment

by:Mohamed Abowarda
ID: 36528164
Any change on the current active page can be done by using Javascript, if you want to deal with PHP as well you will have to use AJAX.

Usually, you can use
document.getElementById('elementNameHere').innerHTML = "Contents here...";

Open in new window

to change HTML DOM element contents, such as DIV, Body, etc...

If you want to send request to PHP page and wait for response, use AJAX:
http://www.w3schools.com/php/php_ajax_php.asp
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 36528690
There are two layers to this question. The client presentation layer is what is addressed by the JavaScript part of things.  The server-side must still validate the input, since hackers will just bypass the JavaScript and post sewage directly into your action script.

A popular AJAX library that facilitates good communication between the server and the client (allows back-end action without an apparent page load) is jQuery.  Start exploring here:
http://docs.jquery.com/Tutorials
0
 

Author Closing Comment

by:DennisHacker
ID: 36533414
The only thing I had to do differently was call the function in the body tag onLoad.  Before I did that, nothing would show up as a default total at the bottom of the form.  The logic that defines the default function is inside the function script in the head of the form.
0

Featured Post

Enroll in August's Course of the Month

August's CompTIA IT Fundamentals course includes 19 hours of basic computer principle modules and prepares you for the certification exam. It's free for Premium Members, Team Accounts, and Qualified Experts!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to prepare an HTML email signature template file containing dynamic placeholders for users' Azure AD data. Furthermore, it explains how to use this file to remotely set up a department-wide email signature policy in Office …
Q&A with Course Creator, Mark Lassoff, on the importance of HTML5 in the career of a modern-day developer.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…
The viewer will the learn the benefit of plain text editors and code an HTML5 based template for use in further tutorials.
Suggested Courses

741 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question