Validate Phone or Fax Number

This is a small javascript function that is useful for validating a phone/fax number. It gives an alert message if user enters data other than numbers.

This ValidateNo function receive two arguments. First argument is html / server control value, which is entered by user. Second argument is comparision string.

There is one javascript function called "ValidateNo".

In this function there are two arguments

   1. NumStr : This is the value which you want to validate. It will come from your form control. It may by TextBox control (HTML or ServerControl).
   2. String : This is predefined format which you can use to validate phone/fax number. It may contain +, - and space. You can modify it as per your requirement.

function ValidateNo(NumStr, String)
{
for(var Idx=0; Idx<NumStr.length; Idx++)
{
var Char = NumStr.charAt(Idx);
var Match = false;

for(var Idx1=0; Idx1<String.length; Idx1++)
{
if(Char == String.charAt (Idx1))
Match = true;
}

if (!Match)
return false;
}
return true;
}

Now create on javascript function called "ValidateDetail".

function ValidateDetail()
{
if(document.myform.phone.value == "")
{
alert("Please specify phone number");
document.myform.phone.focus();
return false;
}

if(!ValidateNo(document.myform.phone.value,"1234567890+- "))
{
alert("Please Enter Only Number");
document.myform.phone.focus();
return false;
}

return true;
}
Now you can call this javascript "ValidateDetail" function for validating your phone and fax number.

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Pradip Patel

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