I want to perform an action do file in controllers/static_pages_controller.rb:

def fileopen
        my_file = File.new("public/CHNAME1.txt","w") 
        my_file.write "\tfasf"
        my_file.close

    end

(it work well when i define it in helper and call it in view.)

in myview.html.erb, i want some thing like <button id="button" onclick="readfile()" /> How can I do that? I tried in application.js

function readfile() {
  alert('readfile work')
  $.ajax({
  alert('ajax work')
      url: "/fileopen",
      type: "POST",
      ##don't know what to do to make fileopen work 
      }
  });
}

routes.rb

 match '/fileopen', to:'static_pages#fileopen', via: 'get'

and it's seem nothing happen. Only the first alert work.

I want to perform an action do file in controllers/static_pages_controller.rb:

def fileopen
        my_file = File.new("public/CHNAME1.txt","w") 
        my_file.write "\tfasf"
        my_file.close

    end

(it work well when i define it in helper and call it in view.)

in myview.html.erb, i want some thing like <button id="button" onclick="readfile()" /> How can I do that? I tried in application.js

function readfile() {
  alert('readfile work')
  $.ajax({
  alert('ajax work')
      url: "/fileopen",
      type: "POST",
      ##don't know what to do to make fileopen work 
      }
  });
}

routes.rb

 match '/fileopen', to:'static_pages#fileopen', via: 'get'

and it's seem nothing happen. Only the first alert work.

• javascript
• jquery
• ruby-on-rails
• ruby
• ajax

Share Improve this question Follow edited Nov 23, 2013 at 4:44 Midori asked Nov 22, 2013 at 9:12 MidoriMidori 2511 silver badge1010 bronze badges 1

• Have you done trying with JQuery? I think that was really help my development time, and much easy. – ksugiarto Commented Nov 22, 2013 at 9:29

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1 Answer 1

Sorted by: Reset to default 3

In answer to your question directly, you have to be able to handle the JS request in the controller. This is typically done by using the respond_to block in Rails, like this:

def fileopen
    respond_to do |format|
        format.js {
            my_file = File.new("public/CHNAME1.txt","w") 
            my_file.write "\tfasf"
            my_file.close
        }
    end
end

This code may give you some sort of a response with your current code, but it might be the case that you need to appreciate better how Ajax & Rails work in order to help you better

---

How Ajax Works

Ajax is a javascript technology which sends an "asynchronous" request to other pages on your website. By their nature, asynchronous requests are done pletely independently of your main HTTP request, and basically act like a "pseudo" browser -- working in the background

Ajax is used to pull data from JS-enabled endpoints (which are handled with the respond_to function in Rails, which you can then use to modify your page in some way. A lot of people get confused with Ajax, but it's actually quite simple -- it's just javascript which pulls data from another page, allowing you to manipulate your page with that data

---

Using Ajax In Your Views

The reason why this is important for you is because you mentioned you didn't know what to do with the success callback of your app. Hopefully my explanation will show you that the success part of the $.ajax call should be used to append the data you receive from the controller on your page

This can be done in this way:

$("#button").click(function() {
  $.ajax({
      url: "/static_pages/fileopen",
      type: "POST",
      data: {name: $(this).val()},
      success: function (data) { 
          // append data to your page
          $("page_element").html(data);
      }
  });
});