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POJQuery, updating form and exception if update it more then once
 

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  1. POJQuery, updating form and exception if update it more then once
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    <p>I've got index of my elements: </p> <pre><code>&lt;h2&gt;Index&lt;/h2&gt; &lt;script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; $(document).ready(function () { $('button').click(function () { $.post("Home/Swap", $("#log").serialize(), function (data) { $("#log").load("Home/Index #log"); }); }); }); &lt;/script&gt; &lt;form name="list" action="&lt;%=Url.Action("Post", "Home")%&gt;" method="post" id="log"&gt; &lt;% foreach (var k in Model) { %&gt; &lt;input type="checkbox" id="ids" name="ids" value="&lt;%=k.pos%&gt;" /&gt;&lt;%= k.pos %&gt;. To jest numer: &lt;%=k.name%&gt;&lt;br /&gt; &lt;% } %&gt; &lt;/form&gt; &lt;button&gt;Swap&lt;/button&gt; </code></pre> <p>and Swap method:</p> <pre><code> public ActionResult Swap(int[] ids) { int pos1=ids[0]; int pos2=ids[1]; Element element1 = (from t in db.Elements where t.pos == pos1 select t).Single(); Element element2 = (from t in db.Elements where t.pos == pos2 select t).Single(); element1.pos = pos2; element2.pos = pos1; db.SaveChanges(); return Index(); } </code></pre> <p>Everything works fine at the first swap of elements. But when I swap it once, and then try to swap another two I get an exception: </p> <blockquote> <p>System.NullReferenceException was unhandled by user code<br> Message=Object reference not set to an instance of an object.</p> </blockquote> <p>(exception from Swap Method) It's JQuery problem, Im sure. I susspect this <code>$("#log").load("Home/Index #log");</code> line - it shows me right result, but doesn't work fine if I try to do it more then once. how to fix it?</p> <p>edit: when I refresh page it works the same -> first works well, after getting an exception (the first touched elements are swaped after refreshing)</p>
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