如何从JavaScript发送GET请求到rails

Question

I've been googling all day and still couldn't find any answers.So basically in my javascript function, I want to send a GET request to my rails controller and the rails controller will send back a JSON object. Any idea how do I do this? thnx

Answer 1

Using jQuery I would do something like this:

In the selector and event you want, for instance on clicking some element:

 $(function() { $('#foo').click( function(){ var params = '{"field1": "value1", "field2: "value2"}'; $.get('/controller/bar', params, function(data){ alert(data); }); }); }); 

Then in your Rails controller:

 def bar /// hack hack hack render :json => {"response" => "OK"} end 

The in your routes.rb:

  match 'controller/bar' => 'controller#bar'

Finally, change "controller" according to your code. Firebug is your friend!

Answer 2

you can use jQuery ajax to make get or post request from javascript.

jQuery.ajax({
  url: "url to controller method", // it should be mapped in routes.rb in rails
  type: "GET",
  data: {field1 :value1, field2:value2}, // if you want to send some data.
  dataType: "json"
  success: function(data){
  // data will be the response object(json)
  }
});

response from rails will something similar to the below, you can modify as per your requirement.

respond_to do |format|
  format.js { render :json => @json_data }
end