是否将JavaScript行为添加到Ruby代码？

Question

This is the controller code that I'm using for the delete action in my Rails application. I'm not using a separate view for the delete action.

def delete
    @industry = Industry.find(params[:id])
    @industry.destroy
    flash[:notice] = "Industry successfully deleted"
    redirect_to(:action => 'index')
  end

The action is triggered and executed in the index view itself, however I wish to add two things:

1. How can I create a JavaScript alert that warns the user before deleting the object?
2. The flash message stays at the top of the index page. How can I add JavaScript so that the flash message box appears and vanishes after 10 seconds?

Basically, how do I intercept the destroy action in Rails 4?

Answer 1

To remove the flash after 10 seconds:

$('.your-alert-div').delay(10000).fadeOut(400); // The fadeOut is just a transition I added. you can do remove() instead

Similarly, you can use setTimeout.

window.setTimeout(function() {
  $(".alert").fadeTo(500, 0).slideUp(500, function(){
      $(this).remove();
  });
}, 6000);

To ask a user through a JavaScript alert, before they delete something, you can do something like this to your link:

<%= link_to "Delete", object, :method => :delete, :data => { :confirm => "Are you sure?" } %>

Answer 2

The alert has nothing to do with this action. You need to render that JavaScript in the previous page, the one that makes a request to this action.

By the time the action is invoked, it's too late to prompt the user.

The notice is similarly unrelated to this action. You need some JavaScript which is attached to your layout, which uses setTimeout to hide the notice element when its present in the DOM.