Phone Format using Javascript is not working in Firefox

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I am using the following function for auto format of phone numbers. It is working good in other browsers except Firefox. Please can any body tell me why it is not working in Firefox.

function FormatPhone()
       {

           if( ((window.event.keyCode >= 97) && (window.event.keyCode <= 122)) || ((window.event.keyCode >= 65) && (window.event.keyCode <= 90)) )
           {
               return false;
           }
           else
           {
               if (event.keyCode == 8 || event.keyCode==37)
               {
                   return;
               }

               phone = event.srcElement.value;
               if (phone.length==1 && phone != "(")
               {
                   event.srcElement.value = "(" + phone;
               }
               else if (phone.length==4 && phone.substring(0,1) == "(" && ! isNaN(phone.substring(1,4)))
               {
                   event.srcElement.value = phone + ") ";
               }
               else if (phone.length==9 && phone.substring(0,1) == "(" && ! isNaN(phone.substring(1,4)) && phone.substring(4,5) == ")" && ! isNaN(phone.substring(6,9)))
               {
                   event.srcElement.value = phone + "-";
               }
           }
       }

I am calling this function in the page_load

txtPhone2.Attributes.Add("Onkeypress", "return FormatPhone()");

Thank you very much,
Nag

Posted 10-Sep-12 9:42am

ureachnag

Updated 10-Sep-12 9:56am

v2

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ureachnag · Answer 1 · 2012-09-10T11:32:00

I have solved this problem with the below code...

function FormatPhone(e) {
            evt = e || window.event;
            var keyPressed = evt.which || evt.keyCode;

            if(((keyPressed >= 97) && (keyPressed <= 122)) || ((keyPressed >= 65) && (keyPressed <= 90))) {
                return false;
            }
            else {
                if (keyPressed == 8 || keyPressed == 37) {
                    return;
                }

                var target = evt.target || evt.srcElement;

                phone = target.value;
                if (phone.length == 1 && phone != "(") {
                    target.value = "(" + phone;
                }
                else if (phone.length == 4 && phone.substring(0, 1) == "(" && !isNaN(phone.substring(1, 4))) {
                    target.value = phone + ") ";
                }
                else if (phone.length == 9 && phone.substring(0, 1) == "(" && !isNaN(phone.substring(1, 4)) && phone.substring(4, 5) == ")" && !isNaN(phone.substring(6, 9))) {
                    target.value = phone + "-";
                }
            }
        }

and passing the event in the page_load

txtPhone2.Attributes.Add("Onkeypress", "return FormatPhone(event)");

Thanks,
Nag