blocks|key|724524|text|如果你在你的链接或表单中使用:remote+=>+true，你会这样做：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|724525|respond_to+do+%7Cformat%7C
++format.js+{+#Do+some+stuff+}|code-block|syntax|javascript|724526|您还可以通过调用request.xhr?在respond_to块之前进行检查。|724527|entityMap^0|E|F|0|0|8|C|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

If you're using <code>:remote =&gt; true</code> in your links or forms, you'd do:

<pre><code>respond_to do |format|
 format.js { #Do some stuff }
</code></pre>

You can also check before the respond_to block by calling <code>request.xhr?</code>.

blocks|key|724558|text|您可以检查一个header[X-Requested-With]，看看它是否是一个AJAX请求。这里有一个关于如何做到这一点的好的article。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|724559|下面是一个示例：|724560|if+request.xhr?
++#+respond+to+Ajax+request
else
++#+respond+to+normal+request
end|code-block|syntax|javascript|724561|entityMap|0|LINK|mutability|MUTABLE|url|http://www.learningjquery.com/2010/03/detecting-ajax-events-on-the-server^0|7|O|1S|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

You can check for a <code>header[X-Requested-With]</code> to see if it is an AJAX request. Here is a good <a href="http://www.learningjquery.com/2010/03/detecting-ajax-events-on-the-server" rel="noreferrer">article</a> on how to do it. 

Here is an example:

<pre><code>if request.xhr?
 # respond to Ajax request
else
 # respond to normal request
end
</code></pre>

blocks|key|508091|text|更新：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|508092|在Rails+6.1.0中，xhr?()实际上(最终)返回了一个布尔值。|offset|length|style|CODE|508093|https://github.com/rails/rails/commit/0196551e6039ca864d1eee1e01819fcae12c1dc9#diff-60b77e427ea7ba142faa477fac10b8d0134cede4e35a3b1953c425200fadf1acL267-L269|508094|508095|原始答案：|508096|医生说request.xhr？|508097|Returns+true+if+the+“X-Requested-With”+header+contains+“XMLHttpRequest”....|code-block|syntax|javascript|508098|但要当心|508099|request.xhr?+|508100|根据=~返回数值或nil值，而不是文档中所说的布尔值。|508101|irb(main):004:0>+/hay/+=~+'haystack'
=>+0
irb(main):006:0>+/stack/+=~+'haystack'
=>+3
irb(main):005:0>+/asfd/+=~+'haystack'
=>+nil|508102|它是基于这样的：|508103|#+File+actionpack/lib/action_dispatch/http/request.rb,+line+220
def+xml_http_request?
++@env['HTTP_X_REQUESTED_WITH']+=~+/XMLHttpRequest/
end|508104|所以|508105|env['HTTP_X_REQUESTED_WITH']+=~+/XMLHttpRequest/++=>+0|508106|文档：|508107|http://apidock.com/rails/v4.2.1/ActionDispatch/Request/xml_http_request%253F|508108|entityMap|0|LINK|mutability|MUTABLE|url|1|http://apidock.com/rails/v4.2.1/ActionDispatch/Request/xml_http_request%253F^0|0|E|6|0|0|4D|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|22|1|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1N|8|@$D|1O|E|1P|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1Q|8|@]|9|@$D|1R|E|1S|1|1T]]|A|$]]|$1|J|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1V|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1W|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|1X|8|@]|9|@]|A|$R|S]]|$1|T|3|U|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|V|3|W|5|Q|7|1Z|8|@]|9|@]|A|$R|S]]|$1|X|3|Y|5|6|7|20|8|@]|9|@]|A|$]]|$1|Z|3|10|5|Q|7|21|8|@]|9|@]|A|$R|S]]|$1|11|3|12|5|6|7|22|8|@]|9|@]|A|$]]|$1|13|3|14|5|Q|7|23|8|@]|9|@]|A|$R|S]]|$1|15|3|16|5|6|7|24|8|@]|9|@]|A|$]]|$1|17|3|18|5|Q|7|25|8|@]|9|@]|A|$R|S]]|$1|19|3|1A|5|6|7|26|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|6|7|27|8|@]|9|@$D|28|E|29|1|2A]]|A|$]]|$1|1D|3|-4|5|6|7|2B|8|@]|9|@]|A|$]]]|1E|$1F|$5|1G|1H|1I|A|$1J|I]]|1K|$5|1G|1H|1I|A|$1J|1L]]]]

<h3>Update:</h3>
As of Rails 6.1.0, <code>xhr?()</code> does actually (finally) return a boolean value.
<a href="https://github.com/rails/rails/commit/0196551e6039ca864d1eee1e01819fcae12c1dc9#diff-60b77e427ea7ba142faa477fac10b8d0134cede4e35a3b1953c425200fadf1acL267-L269" rel="nofollow noreferrer">https://github.com/rails/rails/commit/0196551e6039ca864d1eee1e01819fcae12c1dc9#diff-60b77e427ea7ba142faa477fac10b8d0134cede4e35a3b1953c425200fadf1acL267-L269</a>
<hr />
<h3>Original Answer:</h3>
The docs say that request.xhr?
<pre><code>Returns true if the “X-Requested-With” header contains “XMLHttpRequest”....
</code></pre>
But BEWARE that
<pre><code>request.xhr? 
</code></pre>
returns numeric or nil values not BOOLEAN values as the docs say, in accordance with =~.
<pre><code>irb(main):004:0&gt; /hay/ =~ 'haystack'
=&gt; 0
irb(main):006:0&gt; /stack/ =~ 'haystack'
=&gt; 3
irb(main):005:0&gt; /asfd/ =~ 'haystack'
=&gt; nil
</code></pre>
It's based on this:
<pre><code># File actionpack/lib/action_dispatch/http/request.rb, line 220
def xml_http_request?
 @env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/
end
</code></pre>
so
<pre><code>env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/ =&gt; 0
</code></pre>
The docs:
<a href="http://apidock.com/rails/v4.2.1/ActionDispatch/Request/xml_http_request%3F" rel="nofollow noreferrer">http://apidock.com/rails/v4.2.1/ActionDispatch/Request/xml_http_request%3F</a>

blocks|key|508155|text|我喜欢使用before_action过滤器。当您需要对多个操作使用相同的筛选器/授权时，它们尤其有用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|508156|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|code-block|syntax|javascript|508157|entityMap^0|5|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

I like using <code>before_action</code> filters. They are especially nice when you need the same filter/authorization for multiple actions.

<pre class="lang-rb prettyprint-override"><code>class MyController &lt; 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
</code></pre>

blocks|key|724737|text|request.xhr?+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|724738|如果返回0，则表示这是一个ajax请求，否则将返回nil|unstyled|724739|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>request.xhr? 
</code></pre>

if this return 0 then it means its an ajax request, else it will return nil

In my action I wish to only respond with processing if it was called from an AJAX request. How do I check?

I want to do something like this:

<pre><code>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
</code></pre>

Rails detect if request was AJAX

在我的操作中，如果处理是从AJAX请求中调用的，我希望只用处理来响应。我该怎么检查？我想做这样的事情：def action   @model = Model.find(params[:id])   respond_to do |format|      if (wasAJAXRequest()) #How do I d...

问Rails检测请求是否是AJAX
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