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Adding checkdnsrr() function to a form validation?

Can I add this PHP function into a Javascript Form Validator?

1:08 am on Jun 30, 2009 (gmt 0)

New User

5+ Year Member

joined:Apr 30, 2009
posts: 30
votes: 0

Hi, I have a contact form and I'm wondering if there's a way to add the PHP checkdnsrr() function to my current validation:

<script type="text/JavaScript">
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;

function MM_validateForm() { //v4.0
var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
if (val) { nm=val.name; if ((val=val.value)!="") {
if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
if (p<1 p==(val.length-1)) errors+='- Please enter a valid email address.\n';
} else if (test!='R') { num = parseFloat(val);
if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
min=test.substring(8,p); max=test.substring(p+1);
if (num<min max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
} } } else if (test.charAt(0) == 'R') errors += '- Please enter your '+nm+'.\n'; }
} if (errors) alert('The following error(s) occurred:\n'+errors);
document.MM_returnValue = (errors == '');

I'd like to check the domain of an email address so I'd use something like this:

list($userName, $mailDomain) = split("@", $email);
if (checkdnsrr($mailDomain, "MX")) {

2:02 pm on June 30, 2009 (gmt 0)

Junior Member

10+ Year Member

joined:June 19, 2003
posts: 198
votes: 0

You cannot evaluate php on the client.

If your php is doing some real work (maybe going out and checking that $mailDomain exists out on the web or doing an imap connect to verify email address), you could consider building out an ajax call.

My guess, however, is that you are just doing some string manipulation against the user-provided strings which could be rewritten in javascript and done at the client.


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