Ruby-on-rails 如何从 Rails 中的控制器调用 javascript 函数
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how to call javascript functions from the controller in rails
提问by Andy Harvey
I'm trying to call a javascript function (actually coffeescript) from a controller in a Rails 3.2 app.
我正在尝试从 Rails 3.2 应用程序中的控制器调用 javascript 函数（实际上是 coffeescript）。
I'm getting a Render and/or redirect were called multiple times in this actionerror.
我收到一个Render and/or redirect were called multiple times in this action错误。
My code looks like this:
我的代码如下所示：
#Model.controller
def index
@models = Model.all
my_action if current_user.name == "Bob" #or some other general conditional
...and some stuff
respond_to do |format|
format.html
format.js #this is needed to handle ajaxified pagination
end
end
def my_action
respond_to do |format|
format.js { render :js => "my_function();" } #this is the second time format.js has been called in this controller!
end
end
#functions.js.coffee.erb
window.my_function = ->
i = xy
return something_amazing
What is the correct way to call a js function from the controller?
从控制器调用 js 函数的正确方法是什么？
回答by Billy Chan
Man, you missed argument for block. Primary mistake.
伙计，你错过了阻止的论点。主要错误。
def my_action
#respond_to do # This line should be
respond_to do |format|
format.js { render :js => "my_function();" }
end
end
And MrYoshiji's point is right. But your error was on server side, had not reached client side yet.
吉二先生的观点是对的。但是你的错误是在服务器端，还没有到达客户端。
For the style, I think that's okay if the js code is one function call only. If more JS code, it's better to render js template
对于样式，我认为如果 js 代码只是一个函数调用就可以了。如果js代码比较多，最好渲染js模板
# controller
format.js
# app/views/my_controller/my_action.js.erb
my_function();
// and some more functions.
Update: How to fix double rendering problem
更新：如何解决双重渲染问题
You must have your #index return if condition met, or the method will continue to execute and cause rendering twice or more. Fix it like this:
如果条件满足，您必须让 #index 返回，否则该方法将继续执行并导致渲染两次或更多次。像这样修复它：
def index
@models = Model.all
if current_user.name == "Bob"
return my_action
else
# ...and some stuff
respond_to do |format|
format.html
format.js #this is needed to handle ajaxified pagination
end
end
