jQuery-Validation-Engine -- Making sure fields values do not equal - jquery-validation-engine

Question

I'm using jQuery-Validation-Engine to do some client side checking before sending a form to the server.
I know you can check to make sure two fields match using validate[equals[fieldId]] where fieldId is the id of the field you want to match. Useful if you want to make sure passwords match, for example.
Now I am trying to find a way to make sure fields don't match. For example, if I wanted to make sure a password field did not match a username field.
Has anyone been able to get this to work? Any other ideas?
Thanks.

Answer 1

After some research and trial and error, I answered my own question. I'll post what I did here so others who need to do the same thing will have a reference.
Turns out you need to create a new custom function in much the same way you add a custom regex. How to apply a custom regex is fairly well documented, but there's not much on how to implement a custom function (without calling a 3rd party function).
Digging around in the language file gives a better idea of how to handle it.
I had to create a custom validator with a function attached inside the language file (in this case jquery.validationEngine-en.js):
"notEqual": {
"func": function(field, rules, i, options){
return (field.val() == $('#username').val()) ? false : true;
},
"alertText": "* Username and password must be different"
},
In my html markup, I use it like this:
<input type="hidden" name="username" value="yourPassword" id="username"/>
<input class="validate[custom[notEqual]]" type="password" name="confirmPassword" value=""/>
Hope that helps someone.

Answer 2

Thanks for the help. You can also do this using funcCall.
In your case the HTML is:
<input class="validate[funcCall[notEqual]]" type="password" name="confirmPassword" value="">
and the function is:
function notEqual(field){
if(field.val() == $('#username').val()){
return "* Username and password must be different";
}
}
This might be useful for times when you have validation functions that can be re-used from other libraries or other areas of your code.
http://posabsolute.github.io/jQuery-Validation-Engine/#validators/funccall-methodname