Beefing up my Email validation

[CrazyRabbitMan]

I am working on an email validation field. I specialize in php, but have found a fairly impressive and inclusive javascript that works wonders.

The only thing wrong, is that it does not accept compound domain names after the "@", ex: email.arizona.edu. The two .'s trigger the false alert.

I could flog my way through this... but honestly hope somebody who is actually proficient with Javascript has the easy answer. If not.. time to read through this line by line by line... :0p

See below:

function checkMailId(mailids)
{
var arr = new Array('.com','.net','.org','.biz','.coop','.info','.museum','.name','.pro'
,'.edu','.gov','.int','.mil','.ac','.ad','.ae','.af','.ag','.ai','.al',
'.am','.an','.ao','.aq','.ar','.as','.at','.au','.aw','.az','.ba','.bb',
'.bd','.be','.bf','.bg','.bh','.bi','.bj','.bm','.bn','.bo','.br','.bs',
'.bt','.bv','.bw','.by','.bz','.ca','.cc','.cd','.cf','.cg','.ch','.ci',
'.ck','.cl','.cm','.cn','.co','.cr','.cu','.cv','.cx','.cy','.cz','.de',
'.dj','.dk','.dm','.do','.dz','.ec','.ee','.eg','.eh','.er','.es','.et',
'.fi','.fj','.fk','.fm','.fo','.fr','.ga','.gd','.ge','.gf','.gg','.gh',
'.gi','.gl','.gm','.gn','.gp','.gq','.gr','.gs','.gt','.gu','.gv','.gy',
'.hk','.hm','.hn','.hr','.ht','.hu','.id','.ie','.il','.im','.in','.io',
'.iq','.ir','.is','.it','.je','.jm','.jo','.jp','.ke','.kg','.kh','.ki',
'.km','.kn','.kp','.kr','.kw','.ky','.kz','.la','.lb','.lc','.li','.lk',
'.lr','.ls','.lt','.lu','.lv','.ly','.ma','.mc','.md','.mg','.mh','.mk',
'.ml','.mm','.mn','.mo','.mp','.mq','.mr','.ms','.mt','.mu','.mv','.mw',
'.mx','.my','.mz','.na','.nc','.ne','.nf','.ng','.ni','.nl','.no','.np',
'.nr','.nu','.nz','.om','.pa','.pe','.pf','.pg','.ph','.pk','.pl','.pm',
'.pn','.pr','.ps','.pt','.pw','.py','.qa','.re','.ro','.rw','.ru','.sa',
'.sb','.sc','.sd','.se','.sg','.sh','.si','.sj','.sk','.sl','.sm','.sn',
'.so','.sr','.st','.sv','.sy','.sz','.tc','.td','.tf','.tg','.th','.tj',
'.tk','.tm','.tn','.to','.tp','.tr','.tt','.tv','.tw','.tz','.ua','.ug',
'.uk','.um','.us','.uy','.uz','.va','.vc','.ve','.vg','.vi','.vn','.vu',
'.ws','.wf','.ye','.yt','.yu','.za','.zm','.zw');

var mai = mailids;
var val = true;
var beforeat="";
var afterat="";
var afterat2="";

var dot=mai.lastIndexOf(".");
var con=mai.substring(dot, mai.length);
con=con.toLowerCase();
con=con.toString();

for(var i=0;i<(arr.length);i++)
{
if(con == arr)
{
val=true;
break;
}
else
{
val=false;
}
}

var att=mai.lastIndexOf("@");
beforeat=mai.substring(0,att);
beforeat=beforeat.toLowerCase();
beforeat=beforeat.toString();
var asci1=beforeat.charCodeAt(0);

afterat=mai.substring(att+1, dot);
afterat=afterat.toLowerCase();
afterat=afterat.toString();

afterat2=mai.substring(att+1, mai.length);
afterat2=afterat2.toLowerCase();
afterat2=afterat2.toString();

if(beforeat=="" || afterat=="" || beforeat.length>30)
val=false;

if(afterat2.length>64 || afterat.length<2)
val=false;

if((afterat.charCodeAt(0))==45 || (afterat.charCodeAt(afterat.length-1))==45)
val=false;

if(val==true)
{
if(asci1 > 47 && asci1 < 58)
val=false;

if(asci1 < 48 || asci1 > 57)
{
for(var i=0; i<=beforeat.length-1; i++)
{
var asci2=beforeat.charCodeAt(i);
if((asci2<=44 || asci2==47) || (asci2>=58 && asci2<=94) || (asci2==96) || (asci2>=123 && asci2<=127))
{
val=false;
break;
}
}

for(var j=0; j<=afterat.length-1; j++)
{
var asci3=afterat.charCodeAt(j);
if((asci3<=44) || (asci3==46) || (asci3==47) || (asci3>=58 && asci3<=96) || (asci3>=123 && asci3<=127))
{
val=false;
break;
}
}
}
}

if(val==false)
{
alert("The Recipient's email - "+mai+" - is not valid");
return false;
}
else
{
return true;
}
}
</script>

 

[CrazyRabbitMan]

So... Flogging through this wasn't as bad as I thought.

If you change:

var asci3=afterat.charCodeAt(j);
if((asci3<=44) || (asci3==46) || (asci3==47) || (asci3>=58 && asci3<=96) || (asci3>=123 && asci3<=127))

to:

var asci3=afterat.charCodeAt(j);
if((asci3<=44) || (asci3==47) || (asci3>=58 && asci3<=96) || (asci3>=123 && asci3<=127))

deleting the asci3==46, then it will allow the compound domain names like email.arizona.edu

Hope this helps increase the usefullness of the previous script.