Ruby-on-rails Rails 检测请求是否为 AJAX
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Rails detect if request was AJAX
提问by Razor Storm
In my action I wish to only respond with processing if it was called from an AJAX request. How do I check?
在我的操作中，如果它是从 AJAX 请求调用的，我希望只响应处理。我如何检查？
I want to do something like this:
我想做这样的事情：
def action
@model = Model.find(params[:id])
respond_to do |format|
if (wasAJAXRequest()) #How do I do this?
format.html #action.html.erb
else
format.html {redirect_to root_url}
end
end
回答by Amir Raminfar
回答by Sean Hill
If you're using :remote => truein your links or forms, you'd do:
如果你:remote => true在你的链接或表单中使用，你会这样做：
respond_to do |format|
format.js { #Do some stuff }
You can also check before the respond_to block by calling request.xhr?.
您还可以通过调用在 respond_to 块之前进行检查request.xhr?。
回答by pixelearth
The docs say that request.xhr?
文档说 request.xhr?
Returns true if the “X-Requested-With” header contains “XMLHttpRequest”....
But BEWARE that
但请注意
request.xhr?
returns numeric or nil values not BOOLEAN values as the docs say, in accordance with =~.
根据=~，返回数字或 nil 值，而不是文档所说的 BOOLEAN 值。
irb(main):004:0> /hay/ =~ 'haystack'
=> 0
irb(main):006:0> /stack/ =~ 'haystack'
=> 3
irb(main):005:0> /asfd/ =~ 'haystack'
=> nil
It's based on this:
它基于此：
# File actionpack/lib/action_dispatch/http/request.rb, line 220
def xml_http_request?
@env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/
end
so
所以
env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/ => 0
The docs:
文档：
http://apidock.com/rails/v4.2.1/ActionDispatch/Request/xml_http_request%3F
http://apidock.com/rails/v4.2.1/ActionDispatch/Request/xml_http_request%3F
回答by HarlemSquirrel
I like using before_actionfilters. They are especially nice when you need the same filter/authorization for multiple actions.
我喜欢使用before_action过滤器。当您需要对多个操作使用相同的过滤器/授权时，它们特别好。
class MyController < AuthController
before_action :require_xhr_request, only: [:action, :action_2]
def action
@model = Model.find(params[:id])
end
def action_2
# load resource(s)
end
private
def require_xhr_request
redirect_to(root_url) unless request.xhr?
end
end
回答by vidur punj
request.xhr?
if this return 0 then it means its an ajax request, else it will return nil
如果返回 0 则表示它是一个 ajax 请求，否则返回 nil
