Float value checking

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Views: 1270 | Replies: 4

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Join Date: Oct 2007

Location: Penang Island, Malaysia

Posts: 165

Reputation: lordx78 is an unknown quantity at this point

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lordx78

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Junior Poster

Float value checking

Mar 23rd, 2008

 Help with Code Tags 
 html Syntax (Toggle Plain Text) 
<html>
<head>
<script type="text/javascript">
function validateFloat()
   {
      var o = document.frmInput.txtInput;
      switch (isFloat(o.value))
      {
         case true:
            alert(o.value + " is an float")
            break;
         case false:
            alert(o.value + " is not an float")
      }
   }
 
   </script>
</head>
<body>
<form name="frmInput">
   Enter something: <input name="txtInput" size="4">
   <input type="button" value="Validate" onclick="validateFloat()"></input>
</form>
</body>
</html>
<html>
<head>
<script type="text/javascript">
function validateFloat()
   {
      var o = document.frmInput.txtInput;
      switch (isFloat(o.value))
      {
         case true:
            alert(o.value + " is an float")
            break;
         case false:
            alert(o.value + " is not an float")
      }
   }

   </script>
</head>
<body>
<form name="frmInput">
   Enter something: <input name="txtInput" size="4">
   <input type="button" value="Validate" onclick="validateFloat()"></input>
</form>
</body>
</html>

Not working. pls help

Last edited by lordx78 : Mar 23rd, 2008 at 6:12 am.

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Join Date: Mar 2008

Posts: 153

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Suomedia

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Re: Float value checking

Mar 23rd, 2008

The isFloat function is missing.

Matti Ressler
Suomedia

If you want your dreams to come true, the first thing you must do is to wake up....
Suomedia - Dynamic Content Management

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Join Date: Oct 2007

Location: Penang Island, Malaysia

Posts: 165

Reputation: lordx78 is an unknown quantity at this point

Rep Power: 1

Solved Threads: 2

lordx78

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Junior Poster

Re: Float value checking

Mar 24th, 2008

can u help me to solve isFloat, pls.

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Join Date: Mar 2008

Posts: 153

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Suomedia

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Junior Poster

Re: Float value checking

Mar 24th, 2008

This is rather simple (eg, it will return a.b as a float):

Help with Code Tags

(Toggle Plain Text)

function isFloat(value) {
            if (/\./.test(value)) {

                return true;

            } else {

                return false;

            }
          }

Google is your friend to find a more comprehensive float checking function.

Matti Ressler
Suomedia

Last edited by Suomedia : Mar 24th, 2008 at 12:16 pm.

If you want your dreams to come true, the first thing you must do is to wake up....
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Rebellion Revamped

Re: Float value checking

Mar 30th, 2008

A thorough way of doing it would be:

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(Toggle Plain Text)

/**
 * Checks if a given string is float or not
 *
 * @author sos
 * @param {String} val The string in question.
 */
  function isFloat(val) {
    if(!val || (typeof val != "string" || val.constructor != String)) {
      return(false);
    }
    var isNumber = !isNaN(new Number(val));
    if(isNumber) {
      if(val.indexOf('.') != -1) {
        return(true);
      } else {
        return(false);
      }
    } else {
      return(false);
    }
  }

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