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POProblem with asp.net mvc and google maps
 

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  1. POProblem with asp.net mvc and google maps
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    <p>I'm just getting into asp.net mvc and jquery so this might be a "stupid" question.</p> <p>I'm developing an mvc application which contains a Google Map.</p> <p>I've used this blog post as an inspiration </p> <p><a href="http://mikehadlow.blogspot.com/2008/10/using-google-maps-with-mvc-framework.html" rel="nofollow noreferrer">http://mikehadlow.blogspot.com/2008/10/using-google-maps-with-mvc-framework.html</a></p> <p>and it's working as expected.</p> <p>The problem occurs when I want to filter the map data. </p> <p>The use case is the following:</p> <ol> <li>I have a view with a list of element.</li> <li>For each element I have a "Trace" link. </li> <li>The link point to a controller actions and has the element id as parameter.</li> <li>The controller action returns a view.</li> <li>The view has some javascript that calls another controller actions</li> <li>The controller action returns my map data as JSON </li> <li>The script initializes a Google map and displays the JSON data on the map.</li> </ol> <p>I run into problems at 4. The core of the problem is getting the id of the original element to the action that returns the JSON data.</p> <p>This is what I have tried.</p> <p>I've created a parameter class which has a public int id property. The map view is using this class as "View data class"</p> <p>In the view I have added a hidden input field that get filled with the id value from the data class.</p> <pre><code>&lt;input type="hidden" id="_lblId" value="&lt;%=Model.Id%&gt;"/&gt; </code></pre> <p>After that I include the javascript files that should load the Map a get map data from the controller.</p> <p>This is where I run into problems.</p> <p><strong>jQuery:</strong></p> <pre><code>$(function() { var id = parseInt($("#_lblId").val()); $.ajaxSetup({ cache: false }); if (google.maps.BrowserIsCompatible()) { $.getJSON("/Maptest/Element/Tracemap", {id: id}, initialise); } }); </code></pre> <p><strong>Controller Action:</strong></p> <pre><code>public ActionResult Tracemap(int id) { var map = new Map(); var tracedata = _dataRep.ListSkanningerPaaKomponent(Convert.ToInt32(id)); map.Name = "trace for element - " +id; map.Zoom = 2; map.LatLng = new LatLng { Latitude = 0.0, Longitude = 0.0 }; var cnt = 0; foreach (var t in tracedata) { cnt++; var trace = new Trace { Name = "Trace " + cnt, LatLng = new LatLng {Latitude = (double) t.Lat, Longitude = (double) t.Long}, Dato = (DateTime) t.Dato, Tid = (DateTime) t.Tid, Person = t.PersonId }; map.Add(trace); } return Json(map); } </code></pre> <p>If I set a breakpoint in the controller action it never gets called. If I debug the javascript the id value is correct.</p> <p>Using firebug I get this error: 500 Internal Server Error. And the link it tries to call is this : <a href="http://localhost:63246/Maptest/Element/Tracemap?_=1254848265779&amp;id=18" rel="nofollow noreferrer">http://localhost:63246/Maptest/Element/Tracemap?_=1254848265779&amp;id=18</a></p> <p>If I change the action parameter to a string. The break point gets hit, but then id is empty.</p> <p>Any ideas how to solve this? Or other ways to get the element Id to the JSON controller action? </p>
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      1. POProblem with asp.net mvc and google maps
      1. USDavid Kemp
 

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