使用Rails活动记录关联创建JavaScript变量

Question

I wan't to add an active record association to the dom, but am having trouble.

I have this editor class

 .editing
  .row
    .col-sm-3
    .col-sm-8
      .text-left
        #font-20
          .title-font
            .title-editor

As it is, the editor is empty which is what it's supposed to do. But when someone edits their title, I wan't to be able to show their saved title. The loading of this editor is with jquery and there is no page refreshing.

In my javascript I have access to the id of the object I want the title from

js:

var draft = $(e.target).attr('class');
var id = id.slice(draft); 

With that id I want to add the objects title to the dom.
Something like this would be ideal, but I don't think it's possible.

var title = <%= Draft.find_by(id: $id).title %>
$('.title-editor').html(title);

How can I do something like this?

Answer 1

Well, you will need to use ajax eventually...

First, you can make a slight change to your drafts_controller.rb . One of the ways to do this is the following:

def show # @draft is supposingly defined in a before_action callback
    respond_to do |format|
        format.html
        format.json {
            render :json => {'title' = @draft.title}
        }
    end
end

So, if your @draft is : {id:1, title: 'hello'}, you will have:
http://your.app.com/drafts/1.json which will render {"title":"hello"} .

How do you use this? Easy... In your view, you bind this code to an event that will fire it.

$.ajax({
    type: "GET",
    url: "/drafts/"+id+".json",
    dataType: "json",
    success: function(data) {
        $('.title-editor').html(data.title);
    }
});