Rails uses Ajax to refresh the page (beginner's notes)

The content of the article is personal study notes. If there is any mistake, I hope you will criticize and correct it. I am grateful.

Ajax uses the get method to refresh the page (json format data return)

front end:

 $.ajax ({
      method: 'GET',
      url: "/products/" + "hahaha" + "/biaodan",
      dataType: 'json',
      success: function(data){
	  alert(data.ip);
        console.log(data);
      }
    });

Note: You need to specify the url, method, and data type to receive.
Backend:

respond_to do |format|
  		format.json {render json: {ip:@ip}}
end

The processed data ({ip:@ip}) can be used directly on the front end

Ajax uses post method (js form data return)

Front end: Basically no need to do anything, only need to process the returned data, how to perform data processing

<%= form_tag products_biaodan_path,:method=>"post",remote:true do%>
  <%= label_tag("Search for:") %>
  <%= text_field_tag(:aa,:name) %>
  <%= password_field(:pwd,:password) %>
  <%= submit_tag("Search") %>
<% end %>

remote: true is very important, it is responsible for the Ajax processing that is turned on

rear end:

def biaodan
 	@ip = params[:aa]+"666"
	@pwd = params[:pwd][:password]
	Rails.logger.info '=========+++++=============='+@ip
	respond_to do |format|
		format.js              
     end
 end

In this way, @ip and @pwd will be directly transferred to a file named biaodan.js.erb, which can be processed directly.
Note: biaodan.js.erb is named by the method name def biaodan This is very important