Rails AJAX重新加载页面。 为什么？

Question

I create a form:

<%= form_for @cover, :remote => true, :html => { :multipart => true } do |file| %>
    <%= file.file_field(:image, :class => 'choose_image', :onchange => 'this.form.submit()') %>
    <input name="authenticity_token" type="hidden" value="<%=form_authenticity_token %>"/>
<% end %>

So, when I select image it uploads, OK, but after it reload the page and clear all my data. How can I repair it?

UPDATE

My coversController:

def create
    @cover = Cover.create(cover_params)

    if @cover.save
        redirect_to :back
    end
end

Answer 1

As a browser security aspect you can not upload image/file directly through jquery ajax. You either need to create an Iframe Or you can do it with flash(SWF).

In your case :remote => true doing nothing it simply submitting form instead of ajax submit.

You need to add remotipart gem to achieve your desired behaviour. In this gem also you need to add :remote => true and form will submit in ajax way.