blocks|key|1189085|text|在通过AJAX进行调用的链接上的JavaScript单击处理程序中，不返回false或阻止对事件的默认操作。在这种情况下，它还将采用链接的默认操作(即，对同一URL的非AJAX+post+)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1189086|例如。|1189087|<%25=+Html.ActionLink(+"action",+"controller"+)+%25>


$(function()+{
+++$('a').on('click',+function(e)+{
++++++//+solve+with+"e.preventDefault();"+here
++++++var+href+=+$(this).attr('href');
++++++$.get(href,+function()+{+...+});
++++++//+or+solve+with+"return+false;"+here+to+prevent+double+request
+++});
}):|code-block|syntax|javascript|1189088|entityMap^0|11|5|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Not returning <code>false</code> or preventing the default action on the event in a JavaScript click handler on a link that makes the call via AJAX. In this case, it will also take the default action of the link (i.e., a non-AJAX post to the same URL).

Ex.

<pre><code>&lt;%= Html.ActionLink( "action", "controller" ) %&gt;


$(function() {
 $('a').on('click', function(e) {
 // solve with "e.preventDefault();" here
 var href = $(this).attr('href');
 $.get(href, function() { ... });
 // or solve with "return false;" here to prevent double request
 });
}):
</code></pre>

blocks|key|1404429|text|我也遇到过类似的问题。这个问题是由我的_Layout.cshtml文件中的这一行引起的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404430|<link+rel="shortcut+icon"+href="">|code-block|syntax|javascript|1404431|在删除上面的行之后，我的操作被调用一次。|1404432|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had a similar issue. The issue was caused by this line in my _Layout.cshtml file:

<pre><code>&lt;link rel="shortcut icon" href=""&gt;
</code></pre>

After removing the above line, my actions are called once.

blocks|key|1189227|text|很晚了，但我发现|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1189228|<img+id="myLogo"+src="#"/>+|code-block|syntax|javascript|1189229|使其再次调用。希望这对某些人有帮助，原因我不确定。|1189230|在这里找到解决方案。http://skonakanchi.blogspot.com/2011/09/action-method-calling-twice-in-aspnet.html|offset|length|1189231|entityMap|0|LINK|mutability|MUTABLE|url|http://skonakanchi.blogspot.com/2011/09/action-method-calling-twice-in-aspnet.html^0|0|0|0|A|2A|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Very late but I found that having 

<pre><code>&lt;img id="myLogo" src="#"/&gt; 
</code></pre>

caused this to make it do the call again. Hope this helps someone, the reason I am not sure.

Found solution here.
 <a href="http://skonakanchi.blogspot.com/2011/09/action-method-calling-twice-in-aspnet.html" rel="noreferrer">http://skonakanchi.blogspot.com/2011/09/action-method-calling-twice-in-aspnet.html</a>

blocks|key|1404627|text|这也太晚了，但也许这会对某些人有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404628|我的问题类似(控制器方法将在初始加载时触发一次，然后立即异步再次触发)。|1404629|我能够检查HttpContext.request对象，并确定第二个请求是由Visual+Studio的“浏览器链接”特性引起的。|1404630|我禁用了浏览器链接，对控制器方法的神秘ajax调用不再发生。|1404631|How+to+disable+Browser+Link|offset|length|1404632|entityMap|0|LINK|mutability|MUTABLE|url|http://www.asp.net/visual-studio/overview/2013/using-browser-link#disabling^0|0|0|0|0|0|R|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$J|Y|K|Z|1|10]]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

This is late as well but perhaps this will help someone.

My issue was similar (controller method would fire once on initial load and then would fire again right away asynchronously). 

I was able to inspect the HttpContext.request object and determined that the second request was due to Visual Studio's "Browser Link" feature.

I disabled Browser Link and the mystery ajax call to my controller method no longer happens.

<a href="http://www.asp.net/visual-studio/overview/2013/using-browser-link#disabling" rel="noreferrer">How to disable Browser Link</a>

blocks|key|1404737|text|在我的特定情况下，是两次加载jquery.unobtrusive-ajax.min.js文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1404738|这导致$(document).ready(function()+{+});函数被执行两次。|1404739|希望这能对你有所帮助。|1404740|entityMap^0|E|U|0|3|Y|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

In my specific case, it was the loading of <code>jquery.unobtrusive-ajax.min.js</code> file for twice. This was causing the 
<code>$(document).ready(function() { });</code> function to be executed two times.

Hope this is helpful.

blocks|key|1189477|text|我也遇到过类似的问题。该问题由局部view.cshtml文件中的以下行引起：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1189478|<script+src="~/Scripts/jquery-1.10.2.js"></script>
<script+src="~/Scripts/jquery.unobtrusive-ajax.min.js"></script>|code-block|syntax|javascript|1189479|移除后，它是固定的。|1189480|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had a similar issue. The issue was caused by this line in partial view.cshtml file:

<pre><code>&lt;script src="~/Scripts/jquery-1.10.2.js"&gt;&lt;/script&gt;
&lt;script src="~/Scripts/jquery.unobtrusive-ajax.min.js"&gt;&lt;/script&gt;
</code></pre>

after removing it is fixed.

blocks|key|1404938|text|我分享我的经验，以防它服务于某人，我有以下不便|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404939|提交按钮|1404940|<button+type="submit"+class="gb-btn-outline-primary+margin-top-s"+id="btnProcess">
+++<i+class="fas+fa-play+margin-right-xs">+Procesar
+</button>|code-block|syntax|javascript|1404941|他所称的以下Javascript函数|1404942|$(function+()+{
++++++++++++$('#btnProcess').click(function+(e)+{
++++++++++++++++var+plantID+=+$("#plantID+option:selected").val();++++++++++++++++++++
+++++++++++if+(plantID+==+""+%7C%7C+plantID+==+null+%7C%7C+plantID+==+0)+{
++++++++++++++++showMessage("2",+"Seleccione+la+planta");
++++++++++++++++e.preventDefault();
++++++++++++}else{
++++++++++++++++++++var+plant+=+$('#plantID+option:selected').text();
++++++++++++++++++++$("#PlantName").val(plant);
++++++++++++++++++++var+unit+=+$('#UnitID+option:selected').text();
++++++++++++++++++++$("#UnitName").val(unit);
++++++++++++++++++++$("#remakeAudit").val(false);
++++++++++++++++++++$("#frmSearch").submit();
++++++++++++}
++++++++++++});
++++++++});|1404943|我遇到的问题是，我调用了两次操作，因为单击了这一行中的函数和提交-->+$("#frmSearch").submit()；|1404944|该问题的解决方案是使用e.preventDefault()避免默认的函数单击事件；|1404945|通过以下方式：|1404946|+++$(function+()+{
++++++++$('#btnProcess').click(function+(e)+{
+++++++++e.preventDefault();+//<<---
+++++++++var+plantID+=+$("#plantID+option:selected").val();++++++++++++++++++++
++++++++if+(plantID+==+""+%7C%7C+plantID+==+null+%7C%7C+plantID+==+0)+{
++++++++++++showMessage("2",+"Seleccione+la+planta");
++++++++++++e.preventDefault();
++++++++}else{
++++++++++++++++var+plant+=+$('#plantID+option:selected').text();
++++++++++++++++$("#PlantName").val(plant);
++++++++++++++++var+unit+=+$('#UnitID+option:selected').text();
++++++++++++++++$("#UnitName").val(unit);
++++++++++++++++$("#remakeAudit").val(false);
++++++++++++++++$("#frmSearch").submit();
++++++++}
++++++++});
++++});|1404947|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

I share my experience in case it serves someone,I had the following inconvenient

a submit button

<pre><code>&lt;button type="submit" class="gb-btn-outline-primary margin-top-s" id="btnProcess"&gt;
 &lt;i class="fas fa-play margin-right-xs"&gt;&lt;/i&gt; Procesar
 &lt;/button&gt;
</code></pre>

what he called the following Javascript function 

<pre><code>$(function () {
 $('#btnProcess').click(function (e) {
 var plantID = $("#plantID option:selected").val(); 
 if (plantID == "" || plantID == null || plantID == 0) {
 showMessage("2", "Seleccione la planta");
 e.preventDefault();
 }else{
 var plant = $('#plantID option:selected').text();
 $("#PlantName").val(plant);
 var unit = $('#UnitID option:selected').text();
 $("#UnitName").val(unit);
 $("#remakeAudit").val(false);
 $("#frmSearch").submit();
 }
 });
 });
</code></pre>

the problem I had is that I called the action twice because of the click of the function
and the submit in this line --> $("#frmSearch").submit();

the solution to the problem was to avoid the event by default of the function click with
e.preventDefault();

in the following way:

<pre><code> $(function () {
 $('#btnProcess').click(function (e) {
 e.preventDefault(); //&lt;&lt;---
 var plantID = $("#plantID option:selected").val(); 
 if (plantID == "" || plantID == null || plantID == 0) {
 showMessage("2", "Seleccione la planta");
 e.preventDefault();
 }else{
 var plant = $('#plantID option:selected').text();
 $("#PlantName").val(plant);
 var unit = $('#UnitID option:selected').text();
 $("#UnitName").val(unit);
 $("#remakeAudit").val(false);
 $("#frmSearch").submit();
 }
 });
 });
</code></pre>

blocks|key|1404677|text|从视图中删除可以为空的参数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404678|public+ActionResult+Edit(int?+id)|code-block|syntax|javascript|1404679|至|1404680|public+ActionResult+Edit(int+id)|1404681|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Remove null able argument from view 

<pre><code>public ActionResult Edit(int? id)
</code></pre>

to 

<pre><code>public ActionResult Edit(int id)
</code></pre>

blocks|key|1404859|text|在我的控制器中，方法A调用方法B。很明显，它们被调用了两次。我通过写入输出窗口验证了这一点。有趣的是，它说：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1404860|Method+A+was+called.
Method+A+was+called.
Method+B+was+called.+
Method+B+was+called.|code-block|syntax|javascript|1404861|我会期待A，B，A，B。而且，尽管有两次呼叫，我只收到了一次XHR.statusText。我知道，因为该文本会自动添加到浏览器的表格中。|1404862|无论如何，这个问题与jquery.form.js有关。我使用它来启用AJAX文件上传。|1404863|文档中提到，在$(document).ready()期间初始化jquery.form.js到表单的连接时，可以添加一个名为"url“的选项。如果不这样做，它将默认为表单的操作。|1404864|我依赖于默认设置，并获得了两次调用。|1404865|当我添加url选项并从form标签中删除操作时，这个问题就消失了。|1404866|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

In my controller, method A calls method B. It was evident that they were being called twice. I verified this by writing to the output window. Interestingly, it said:

<pre><code>Method A was called.
Method A was called.
Method B was called. 
Method B was called.
</code></pre>

I would have expected A, B, A, B. Also, despite the double calls, I only received back XHR.statusText once. I know, because that text is added automatically to a table in the browser.

Anyway, the problem related to jquery.form.js. I use it to enable AJAX file uploading.

The documentation says that when initializing the connection of jquery.form.js to your HTML form during $(document).ready(), you can add an option called "url". If you don't, it defaults to the ACTION of your form.

I was relying on the default, and getting the double calls.

The problem went away when I added the url option and removed the ACTION from the form tag.

blocks|key|1405001|text|在我的例子中，我只需要在我的操作上添加一个[HttpPost]，问题就解决了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1405002|entityMap^0|L|A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

In my case I just had to add a <code>[HttpPost]</code> on my action and the problem was solved.

blocks|key|1405062|text|在我的例子中，我注意到每次我开始输入url时，浏览器都会预先加载页面。当我按回车键时，它会再次被调用。解决方案只是检查它是否正在运行，如果正在运行，则阻止方法调用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1405063|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case I noticed that every time I would start typing the url, the browser preloaded the page. When I then hit enter, it would get called again. The solution was simply to check if it was running, and then prevent the method call, if it was.

blocks|key|1189854|text|在我的例子中，这是因为"AdBlock“chrome扩展，如果有人遇到这个问题，请确保你在浏览器的隐身模式下进行了测试！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1189855|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case, it was because of &quot;AdBlock&quot; chrome extension, if anyone encounters this problem be sure you made a test on incognito mode of browser!

I have a specific controller action that is being called twice, which aside from being weird is causing problems with a singleton portion of my application (not really a problem, it just brought the double call to my attention).

Any idea why a controller action would be executed twice every time?

ASP.NET MVC Action is Called Twice

Visual Studio

我有一个特定的控制器动作，它被调用了两次，除了奇怪之外，它还导致了我应用程序的单例部分出现问题(实际上不是问题，它只是引起了我对双重调用的注意)。你知道为什么一个控制器的动作每次都要执行两次吗？

问ASP.NET MVC操作被调用两次
EN

回答 12

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