Question

I m trying to learn how to GET data from my rails 3.2.2 project asynchronously. I am new to both javascript and jquery but I ve learned, javascript cannot GET data from a server in a different domain. To get around that I ve read about using $.ajax(), $getJSON(), and/or $.jsonp(), so my first question is when should you use one over another?

我试图获得一种工作技术(例如,在我的铁路3.2.2项目内,Jajax()美元)。我有一个简单的耳光,包括1个控制器 =>图像和1个实地 =>t.string:名称。

class ImagesController < ApplicationController
  # GET /images
  # GET /images.json
  def index
    @images = Image.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @images }
    end
  end

  # GET /images/1
  # GET /images/1.json 
  def show
    @image = Image.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @image }
    end
  end

  # GET /images/new
  # GET /images/new.json
  def new
    @image = Image.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @image }
    end
  end

  # GET /images/1/edit
  def edit
    @image = Image.find(params[:id])
  end

  # POST /images
  # POST /images.json
  def create
    @image = Image.new(params[:image])

    respond_to do |format|
      if @image.save
        format.html { redirect_to @image, notice:  Image was successfully created.  }
        format.json { render json: @image, status: :created, location: @image }
      else
        format.html { render action: "new" }
        format.json { render json: @image.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /images/1
  # PUT /images/1.json
  def update
    @image = Image.find(params[:id])

    respond_to do |format|
      if @image.update_attributes(params[:image])
        format.html { redirect_to @image, notice:  Image was successfully updated.  }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @image.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /images/1
  # DELETE /images/1.json
  def destroy
    @image = Image.find(params[:id])
    @image.destroy

    respond_to do |format|
      format.html { redirect_to images_url }
      format.json { head :no_content }
    end
  end
end

I first want to explore the index action and GET a list of image names using an $.ajax() call in up.html:

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js">    </script>
</head>
<body>
    <script>
        $(document).ready( function (){ 
            $("button").click(function(){
                    $.ajax({
                        dataType:  jsonp ,
                        url: "http://localhost:3000/images",
                        success: function(response) {
                            console.log(response);
                        }
                    });
            });
        });
    </script>

    <button id ="button" type ="button">Get names</button>

</body>
</html>

我收到了奥塞罗的以下资料:

event.layerX and event.layerY are broken and deprecated in WebKit. They will be removed  from the engine in the near future.
jquery.min.js:16Resource interpreted as Script but transferred with MIME type text/html:  "http://localhost:3000/images?    callback=jQuery15209319186636712402_1334849479698&_=1334849481034".
images:1Uncaught SyntaxError: Unexpected token <

这里损失了。我不敢肯定,我是否应该使用? 回顾? 或者如果我在我的控制人员中有额外的参数,或者说我完全是这样吗?

Answer 1

       $(document).ready( function (){ 
            $("button").click(function(){
                    $.ajax({
                        dataType:  json ,  // not jsonp
                        url: "http://localhost:3000/images.json",
                        success: function(response) {
                            console.log(response);
                        }
                    });
            });
        });

Answer 2

Ignore the first line in your console - that s a standard warning that appeared in recent Chrome/jquery versions.

The second line is telling you that your web app sent html, rather than json

第3行是由于试图将html(通常从“<html......<>/code>”开始)与“json”号一样。



So, you need to tell rails to send you json, not html.  Try changing your url in the json call to ""http://localhost:3000/images.json".

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