Often when creating custom contact forms you want to know if a user has already submitted with a given email address. You can find that out by making an ajax request to the contact app with request parameters contactForm and checkEmail
The contactus app will locate the group for that form and return a found property with a value of true or false wrapped in a standard JsonResult structure
Example request
http://www.kademi.co/contactus?contactForm=contact.html✓Email=aaa@bbb.comExample response
{
"data":{
"found":false
},
"fieldMessages":[],
"messages":[],
"nextHref":"",
"status":true
}