Ajax – MVC3 Razor Ajax Form Submit

ajaxasp.net-mvc-3razor

I use The MVC3 Helper to generate my Ajax form like this:

@using (Ajax.BeginForm("Attended", "Lesson", new AjaxOptions
               {
                   HttpMethod = "GET",
                   InsertionMode = InsertionMode.InsertAfter,
                   UpdateTargetId = "mdl" + item.ID
               }))
            {
                @Html.HiddenFor(modelItem => item.ID);
                @Html.CheckBox("Attended", item.Attended, new { OnChange = "javascript:this.form.submit()"});
            }

I just don't find the proper way to submit the Form on the change event of the checkbox.
I don't want my users to click the submit button.

The HTMLAttribute works, but on the change a postback happens instead of an ajax request.

Does anybody know the answer?

Best Answer

First, create a submit button inside your form, and hide it by setting the attribute style="display:none;". Then, instead of using this.form.submit() in your onchange event, use the following:

$(this).parents('form:first').find(':submit')[0].click();

This will invoke the jquery.unobtrusive-ajax.js script, and complete your Ajax submission.

Related Solutions

Javascript – How to manage a redirect request after a jQuery Ajax call

I read this question and implemented the approach that has been stated regarding setting the response HTTP status code to 278 in order to avoid the browser transparently handling the redirects. Even though this worked, I was a little dissatisfied as it is a bit of a hack.

After more digging around, I ditched this approach and used JSON. In this case, all responses to AJAX requests have the status code 200 and the body of the response contains a JSON object that is constructed on the server. The JavaScript on the client can then use the JSON object to decide what it needs to do.

I had a similar problem to yours. I perform an AJAX request that has 2 possible responses: one that redirects the browser to a new page and one that replaces an existing HTML form on the current page with a new one. The jQuery code to do this looks something like:

$.ajax({
    type: "POST",
    url: reqUrl,
    data: reqBody,
    dataType: "json",
    success: function(data, textStatus) {
        if (data.redirect) {
            // data.redirect contains the string URL to redirect to
            window.location.href = data.redirect;
        } else {
            // data.form contains the HTML for the replacement form
            $("#myform").replaceWith(data.form);
        }
    }
});

The JSON object "data" is constructed on the server to have 2 members: data.redirect and data.form. I found this approach to be much better.

Javascript – Abort Ajax requests using jQuery

Most of the jQuery Ajax methods return an XMLHttpRequest (or the equivalent) object, so you can just use abort().

See the documentation:

abort Method (MSDN). Cancels the current HTTP request.
abort() (MDN). If the request has been sent already, this method will abort the request.

var xhr = $.ajax({
    type: "POST",
    url: "some.php",
    data: "name=John&location=Boston",
    success: function(msg){
       alert( "Data Saved: " + msg );
    }
});

//kill the request
xhr.abort()

UPDATE: As of jQuery 1.5 the returned object is a wrapper for the native XMLHttpRequest object called jqXHR. This object appears to expose all of the native properties and methods so the above example still works. See The jqXHR Object (jQuery API documentation).

UPDATE 2: As of jQuery 3, the ajax method now returns a promise with extra methods (like abort), so the above code still works, though the object being returned is not an xhr any more. See the 3.0 blog here.

UPDATE 3: xhr.abort() still works on jQuery 3.x. Don't assume the update 2 is correct. More info on jQuery Github repository.

Best Answer

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