如何从按钮或链接点击视图调用rails方法

Basically, I'm trying to have a rails method execute when the user clicks on a link (or a button or some type of interactive element).

基本上，我试图在用户点击链接（或按钮或某种类型的交互元素）时执行rails方法。

I tried putting this in the view:

我试着把它放在视图中：

<%= link_to_function 'Add' , function()%>

But that didn't seem to work. It ended up simply calling the function without a user even clicking on the "Add" link.

但这似乎不起作用。它最终只是简单地调用该函数而没有用户甚至点击“添加”链接。

I tried it with link_to as well, but that didn't work either. I'm starting to think there isn't a clean way to do this. Anyway, thanks for your help.

我也尝试使用link_to，但这也无效。我开始认为没有一种干净的方法可以做到这一点。无论如何，谢谢你的帮助。

PS. I defined the method in the ApplicationController and it is a helper method.

PS。我在ApplicationController中定义了该方法，它是一个辅助方法。

1 个解决方案

#1

The view and the controller are independent of each other. In order to make a link execute a function call within the controller, you need to do an ajax call to an endpoint in the application. The route should call the ruby method and return a response to the ajax call's callback, which you can then interpret the response.

视图和控制器彼此独立。为了使链接在控制器内执行函数调用，您需要对应用程序中的端点执行ajax调用。该路由应调用ruby方法并返回对ajax调用的回调的响应，然后您可以解释响应。

As an example, in your view:

例如，在您的视图中：

<%= link_to 'Add', '#', :onclick => 'sum_fn()' %>
<%= javascript_tag do %>
    function sum_fn() {
        /* Assuming you have jQuery */
        $.post('/ajax/sum.json', {
             num1: 100,
             num2: 50
        }, function(data) {
             var output = data.result;
             /* output should be 150 if successful */
        });
    }
<% end %>

In your routes.rb add a POST route for your ajax call endpoint.

在您的routes.rb中为您的ajax调用端点添加POST路由。

post '/ajax/sum' => 'MyController#ajax_sum'

Then suppose you have a MyController class in mycontroller.rb. Then define the method ajax_sum.

然后假设你在mycontroller.rb中有一个MyController类。然后定义方法ajax_sum。

class MyController < ApplicationController
    # POST /ajax/sum
    def ajax_sum
        num1 = params["num1"].to_i
        num2 = params["num2"].to_i
        # Do something with input parameter and respond as JSON with the output
        result = num1 + num2

        respond_to do |format|
              format.json {render :json => {:result => result}}
        end
    end
end

Hope that hopes!

希望希望！

#1