?
Solved

Simple form calculation within repeated region

Posted on 2007-11-29
5
Medium Priority
?
690 Views
Last Modified: 2008-02-20
Hi, I need to perform a simple multiplication calculation within a form that has repeated rows within it.

I have a basic Javascript script that will multiply, by a fixed value, the value a user enters into a textbox and displays it within a readonly textbox beside it. See code below.

I need to be able to use this script (or something similar) in a repeated table within PHP.
<html>
<head>
<script language="javascript" src="remote.js"></script>
<script type="text/javascript">
    function calc(num)
    {
          var multiplier = 2; //your number here
          var result = 0;
          if(isFinite(num))
          {
                result = num * multiplier;
          }
          result = result.toFixed(0);
          document.myform.result.value = result;
    }
</script>
</head>
<body>
<form name="myform">
<input type="text" name="txt1" id="txt1" onkeyup="calc(this.value);"/>
<input type="text" name="result" id="result" readonly="readonly"/>
</form>
</body>
</html>

Open in new window

0
Comment
Question by:MariusGM
[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
  • 2
5 Comments
 
LVL 24

Accepted Solution

by:
glcummins earned 1000 total points
ID: 20375117
Add another parameter to your function that identifies the output field (code below). Then give each of your ouput fields an id, and supply them when you call the function.


function calc(num, fieldID)
{
      var multiplier = 2; //your number here
      var result = 0;
      if(isFinite(num))
      {
            result = num * multiplier;
      }
      result = result.toFixed(0);
      document.getElementById(fieldId).value = result;
}

Open in new window

0
 
LVL 75

Assisted Solution

by:Michel Plungjan
Michel Plungjan earned 1000 total points
ID: 20375128
try this:


<html>
<head>
<script language="javascript" src="remote.js"></script>
<script type="text/javascript">
function calc(theField) {
  var num = theField.value;
  var theForm =theField.form;
  var res = theField.name.replace('txt','res');
  var multiplier = 2; //your number here
  var result = 0;
  if(isFinite(num)) {
    result = num * multiplier;
  }
  result = result.toFixed(0);
  theForm.elements[res].value = result;
}
</script>
</head>
<body>
<form name="myform">
<input type="text" name="txt1" id="txt1" onkeyup="calc(this);">
<input type="text" name="res1" id="res1" readonly="readonly"/>
<input type="text" name="txt2" id="txt2" onkeyup="calc(this);">
<input type="text" name="res2" id="res2" readonly="readonly"/>
</form>
</body>
</html>

Open in new window

0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 20375149
PS:

 var result = 0;
  if(isFinite(num)) {
    result = num * multiplier;
  }
  result = result.toFixed(0);
  theForm.elements[res].value = result;

can be shortened to

  theForm.elements[res].value = (isFinite(num))? (num * multiplier).toFixed(0):0;
0
 
LVL 1

Expert Comment

by:Computer101
ID: 20943733
Forced accept.

Computer101
Community Support Moderator
0

Featured Post

Percona Live Europe 2017 | Sep 25 - 27, 2017

The Percona Live Open Source Database Conference Europe 2017 is the premier event for the diverse and active European open source database community, as well as businesses that develop and use open source database software.

Question has a verified solution.

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

Boost your ability to deliver ambitious and competitive web apps by choosing the right JavaScript framework to best suit your project’s needs.
Many old projects have bad code, but the budget doesn't exist to rewrite the codebase. You can update this code to be safer by introducing contemporary input validation, sanitation, and safer database queries.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …
Suggested Courses

765 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