Validate Phone Number 1

[Joules]

This is probably a beginner question but, I am trying to verify that a phone number entered in my form looks like 123-4567. Is there an easy way to do this?

Thanks!

 

[iza]

yes :
--
get the input string :
tel_number = document.formname.textboxname.value
is there a - at the 4th place ?
tel_number.charAt(3)=="-"
are the 3 first chars numbers ?
isNan(ParseInt(tel_number.substring(0,3),10))
are the 4 last char numbers ?
isNan(ParseInt(tel_number.substring(4,7),10))
--
so your function will look like :
function validate_phone_number(){
var tel_number = document.formname.textboxname.value
if (tel_number.charAt(3)=="-" && !isNan(ParseInt(tel_number.substring(0,3),10)) && !isNan(ParseInt(tel_number.substring(4,7),10))) {
alert("ok this is correct&quot
return true
}
else {
alert("the phone number format is not correct&quot
return false
}
}

--
call the function with :
<form=formname onsubmit=&quot;javascript:return validate_phone_number()&quot;>
please enter your phone number : <input type=text name=textboxname>
</form>


--

let me know if this works !
note : you can do this with a regular expression as well, but it's a bit heavy only to validate a phone number !

 

[Joules]

Thanks! it works, but I get an error when I leave the field if the statement is true. The error say object expected and point to right before the if statement. The code still works though. I took out the alert for a correct entry, but that shouldn't cause an error. Also, it allows you to enter more onto the end. I there a way to make sure that the number only has 4 numbers after the &quot;-&quot; ?

Thanks for your help!
s-) Joules

 

[jaredn]

heres an easier way to validate a phone number, using a regular expression:
<script>

function validate()
{
var rg = /^\d{3}\-\d{4}$/
fld = document.test.phone;
if(!rg.test(fld.value))
{
alert(&quot;Phone number must be in format: ###-####&quot
fld.focus();
fld.select();
return false;
}
}

</script>

<form name=&quot;test&quot; onsubmit=&quot;return validate()&quot;>
<input name=&quot;phone&quot; type=&quot;text&quot; maxlength=&quot;8&quot;><input type=&quot;submit&quot;>
</form> jared@eae.net -

http://webfx.eae.net

 

[tsdragon]

The regular expression is probably the better way to go. The other way might give you an error if the number was shorter than 8 characters, and wouldn't catch numbers longer than 8 characters if the extra character were numeric.
Tracy Dryden
tracy@bydisn.com

Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

 

[Joules]

It works great using the regular expression! Thanks for all the help.

~ Joules :-D

 

[iza]

okokokok i'll use reg exp for everything now ;-)