validating if the input value is float??

[rammie singh]

Hi ..... i want to make a validation for my input text..whether it is float or not...
How can i do it through javascript.

please help.

i tried doing something like this...

  

<td><input type="text" value="<%=noOfWrkLoadPeakToAvgRatioStr%>" size="4" name="noOfWrkLoadPeakToAvgRatio" class="textBoxClassNew" onchange="calculatePerSec(); validateFloat(document.basicWrkLoadForm.noOfWrkLoadPeakToAvgRatio.value)"></td>

and my javascript function is..

 

function validateFloat(floatValue)
 {
          
     alert("float value is.."+floatValue);

     if(isFloat(floatValue))
     alert(floatValue + " is an float");
     else
     alert(floatValue + " is not an float");
     
 }

but on my jsp page it gives error saying an object is expected..
please help ... although the alert staement in the function that is alert("float value is.."+floatValue); is getting printed fine

[David Newton]

*All* text input values are just that: text. You'd need to check against a regular expression, or maybe try converting it and checking for failure--but that may be error-prone.

Also, note that isFloat() is actually Number.isFloat(), not a standalone function.