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Simple form calculation within repeated region

Posted on 2007-11-29
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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>

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Question by:MariusGM
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5 Comments
 
LVL 24

Accepted Solution

by:
glcummins earned 250 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;
}

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0
 
LVL 75

Assisted Solution

by:Michel Plungjan
Michel Plungjan earned 250 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>

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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
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