| Guide /
Tutorial |
Browser elements
.status, .address, .tools, ...
NN /
IE
. Viewable AreaForm elements
.text, .button, .onChange, ...
Table elements
.TR, .TD, .border, ...
Windows functions
.open (pop-up), ...
User Interface
. preloading images
Output
. Alert
boxes
. Status bar
. Windows
Input
. Keyboard
Entries
. Mouse Events
. Form elements
. Input Validation
. - Email Validation
. - Number Validation
Programming
. Conditions
[If-(Then)-Else]
. Variables & Arrays
. Functions & Parameters
. Loops
DHTML and
DOM
. Windows
. - Frames
. Forms
. Tables
. Style Sheets
|
|
Email Validation
| Check for correct syntax
of a given email address. |
function CyJS_Utils_IsEmailValid(checkThisEmail)
{
var myEMailIsValid = true;
var myAtSymbolAt = checkThisEmail.indexOf('@');
var myLastDotAt = checkThisEmail.lastIndexOf('.');
var mySpaceAt = checkThisEmail.indexOf(' ');
var myLength = checkThisEmail.length;
// at least one @ must be present and not before position
2
// @yellow.com : NOT valid
// x@yellow.com : VALID
if (myAtSymbolAt < 1 )
{myEMailIsValid = false}
// at least one . (dot) afer the @ is required
// x@yellow : NOT valid
// x.y@yellow : NOT valid
// x@yellow.org : VALID
if (myLastDotAt < myAtSymbolAt)
{myEMailIsValid = false}
// at least two characters [com, uk, fr, ...] must occur
after the last . (dot)
// x.y@yellow. : NOT valid
// x.y@yellow.a : NOT valid
// x.y@yellow.ca : VALID
if (myLength - myLastDotAt <= 2)
{myEMailIsValid = false}
// no empty space " " is permitted (one may
trim the email)
// x.y@yell ow.com : NOT valid
if (mySpaceAt != -1)
{myEMailIsValid = false}
if (myEMailIsValid == true)
{alert("email is VALID")}
else
{alert("email is NOT valid!")}
return myEMailIsValid
} |
|
|
