MVC 1.0 Ajax.BeginForm() submit inside an Html.BeginForm()

Question

I have a View for creating a new account in my aopplication. This view starts with Html.BeginForm() and hits the right controller (Create) no problems.

I decided to add an Ajax.BeginForm() so that I could make sure an account with the same name doesn't already exist in my application.

When I click the submit using either button it goes to the same controller (Create). To try and differentiate which submit button was clicked, I put in a check to see if the request is Ajax then try to run a different code path. But Request.IsAjaxRequest() doesn't fire. What is my best bet to implement this funtionality in an existing form with MS Ajax?

<% using (Html.BeginForm()) {%>
           ..............
  <% using(Ajax.BeginForm("Echo", 
     new AjaxOptions() { UpdateTargetId = "EchoTarget" })) 
  { %>    
     Echo the following text: 
  <%=Html.TextBox("echo", null, new { size = 40 })%>
  <input type="submit" value="Echo" />
  <% } %>   
  <div id="EchoTarget">

controller code:

[AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Create(User newUser)
    {
        if (Request.IsAjaxRequest())
        {
            return Content("*you hit the ajax button");
        }
        else
        { //regular create code here.....
        }
  </div>

Answer 1

You cannot nest forms, ever, in any HTML page, no matter how you generate the form. It isn't valid HTML, and browsers may not handle it properly. You must make the forms siblings rather than children.

Answer 2

If you insist on multiple form usage..use Javascript in a some function like this

<SCRIPT>
  function InnerFormSubmitter(dataForm, actionForm) {
  actionForm.innerHTML = dataForm.innerHTML;
  actionForm.submit();      
 }
</SCRIPT>

<form name="yourButton" action="ValidateSomething" method="post"></form>

<form name="mainForm" action="SavedData" method="post">
<input type="textbox" name="text1">
<input type="textbox" name="text2">
<button name="validateUserButton" id="FormButton" onChange=
"InnerFormSubmitter  (this.form, document.getElementById('yourButton'))">

</button>
  </form>

Hope this helps!

Addendum on jQuery usage for your scenario:

Since you wanted a link:

<a href="javascript:isValidUser(<%=Model.USerId%>);">Check Availability</a>


function isValidUser(userId) { 
var url = "<CONTROLLER>/<ACTION>/" + userId; 
$.post(url, function(data) { 
    if (data) { 
        // callback to show valid user 
    } else { 
        // callback to show error/permission 
    } 
}); 
}

And you controller should have:

[AcceptVerbs("POST")] 
public bool IsValidUser(int id) { 
 // check availability 
 bool allow = CheckUser(); 

 // if allow then insert 
 if (allow) { 
    //insert user

    return true; 
 } else { 
    return false; 
 } 
}

Further Update on jQuery:

Instead of

document.getElementById('UserIdent').value

you can use

$('#UserIdent').val();

Update on JSON usage

The JsonResult class should be used in the Controller and $.getJson function in the View.

$(function() {
    $('#yourLinkOrButton').click(function() {
        $.getJSON("<CONTROLLER>/GetUserAvailability/", null, function(data) {
            $("#yourDivorLablel").<yourFunctionToUpdateDiv>(data);
        });
     });

  public JsonResult GetUserAvailability()
    {
        //do all validation and retrieval
  //return JsonResult type

    }