rails response_to format.js API [英] rails respond_to format.js API
问题描述
我是一名经验丰富的 JAVA 和 C++ 开发人员,我正在努力了解 Rails 的工作原理.
I am an experienced JAVA and C++ developer and I am trying to understand how rails works.
我在下面得到了这个代码:
I got this code below:
respond_to do |format|
if @line_item.save
format.html { redirect_to store_url }
format.js { render :json => @line_item, :mime_type => Mime::Type.lookup('application/json'),
:callback => 'javascriptFunction' }
我一直在搜索定义我可以在 format.js {}
中传递的内容的 api,但我找不到..
and I've been searching the api that defines what I can pass inside the format.js {}
but I could not find..
首先:format.js
是什么语句,是变量吗?
first of all: what kind of statement is format.js
, is that a variable?
最重要的是:我可以将哪些属性传递给 format.js {} ?你能通过直接链接吗?我搜索了 http://api.rubyonrails.org/
and most important: what attributes can I pass into format.js {} ? can you pass the direct link? I've searched over the http://api.rubyonrails.org/
推荐答案
respond_to do |format|
format.js # actually means: if the client ask for js -> return file.js
end
js
此处指定控制器方法将作为响应发回的 MIME 类型;
默认 Rails mime-types.
如果您也尝试使用 format.yaml
:
js
here specifies a mime-type that the controller method would send back as a response;
Default Rails mime-types.
If you try also with format.yaml
:
respond_to do |format|
format.js
format.yaml
end
这意味着您的控制器将根据客户端的要求返回 yml
或 js
;
that will mean that your controller will return yml
or js
depending on what the client-side is asking;
{}
就 ruby 而言是 阻止;如果你没有指定任何 rails 会尝试从 app/views/[contoller name]/[controller method name].[html/js/...]
{}
in terms of ruby is a block;
If you don't specify any rails will try to render a default file from app/views/[contoller name]/[controller method name].[html/js/...]
# app/controllers/some_controller.rb
def hello
respond_to do |format|
format.js
end
end
会寻找/app/views/some/hello.js.erb
;//至少在 Rails v. 2.3 中.
will look for /app/views/some/hello.js.erb
; // at least in Rails v. 2.3.
如果你指定块:
respond_to do |format|
# that will mean to send a javascript code to client-side;
format.js { render
# raw javascript to be executed on client-side
"alert('Hello Rails');",
# send HTTP response code on header
:status => 404, # page not found
# load /app/views/your-controller/different_action.js.erb
:action => "different_action",
# send json file with @line_item variable as json
:json => @line_item,
:file => filename,
:text => "OK",
# the :location option to set the HTTP Location header
:location => path_to_controller_method_url(argument)
}
end
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