Ajax submit makes a full post after first submit

问题

The first submit works as expected, but the next time it's fully posted back. I'm using jQuery.form plugin, specifically the .ajaxSubmit(options) call to submit the form. There are a couple levels of wrapper div's, but I debug the button.click binds and I can't figure out why the second time, even with the same variables, it does a full post and my partial view is returned on a brand new page.

here, buttonid and screenid are the same on both posts. I indicate this because they're calculated as per a naming convention like <name>Outer (wrapper), <name> (update target), and <name>Form (form to be submitted)

$('.formButton').click(function () {
    var buttonid = $(this).attr('id');
    var screenid = $('#' + buttonid).closest('div:not(.CSRForm)').attr('id').replace('Outer', '');
    //appends a hidden element so I know which button was pressed when posted
    $('#' + screenid + 'Form').append('<input type="hidden" name="submitButton" value="' + buttonid.replace(screenid, '') + '" />');
    $('#' + screenid + 'Form').submit();
}); 

mind the .formButton elements are not inside the form, which is why I had to bind the submit event as such. My partial view only returns the form and not the buttons (they are dynamic)

here is the .ajaxSubmit:

$('.CSRForm').submit(function () {
    var needsValidation = "yes";
    if (needsValidation) {
        $(this).ajaxSubmit({
            target: '#AccountSetup',
            replaceTarget: false,
            success: StepCallWithForm //to check whether the response is valid for redirecting
        });
        return false;
    }
}); 

and my MVC action if it's relevant:

    public ActionResult AccountSetup(AccountSetupViewModel vm, string submitButton)
    {
        if (!ModelState.IsValid)
        {
            return PartialView(vm);
        }
        else
        {
            return Content(submitButton + ",AccountSetup");
        }
    }

Edit: After inserting this line immediately inside my $(function() {:

$('#AccountSetup').ajaxForm();

I was able to stop the full postback. In Firebug, now I see ajax postback to /CSR/Home/CSR? which is where all this stuff is to begin with. It's like the form lost its action property. Are my events somehow crossfiring?

回答1:

Instead of binding to the click event, you could use jQuery's live() event binding, which survives AJAX loading. You can do this by replacing:

$('.formButton').click(function () {

With

$('.formButton').live("click", function () {

回答2:

This could happen if you replace the original form in the success callback with the partial view.

So when you remove some HTML elements (as in replace existing HTML with partial view from the server) all their events are gone as well. Re-adding the same HTML (from your point of view) is just some new HTML to the browser. It doesn't make assumptions whether this new HTML is related to old code or not. That's why you have to re-add all functionality and events if you want the new form to work as it did before.

If this is your case the form will no longer have the submit Ajax action attached and therefore the second time it will perform a full post. For this to work you need to reattach the submit event in the success function:

$(function() {
    ajaxifyForm();
});

function ajaxifyForm() {
    $('#AccountSetup').ajaxForm({
        target: '#AccountSetup',
        replaceTarget: false,
        success: stepCallWithForm
    });
}

function stepCallWithForm(result) {
    // If you replace the #AccountSetup form with the 
    // returned partial result you need to reattach the AJAX submit:
    ajaxifyForm();
}

回答3:

I know this is an old question but I just wanted to add my 2 cents.

@Sohnee's answer will work: live() does the job. However, it has been deprecated. It should be replaced with on:

$("#WrapperDiv").on({
      click:myFunction
   },"#formButton");    

来源：https://stackoverflow.com/questions/3663111/ajax-submit-makes-a-full-post-after-first-submit