Ajax and GDI RSS

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  zivko

  Member

  4 Points

  12 Posts

  Ajax and GDI

  Mar 14, 2008 12:36 PM|LINK

   

  Hi, I have one graph render with GDI+ and now I want to render new graph over existing dinamically.

  Graph is render in image object:

  <asp:image id="imgGrafikon" ImageUrl="graph1.aspx" runat="server" />

  I have javascript function for dinamic render image.

  function Graph()

  {

        var url="Ajax/graphRender.aspx";

        url=url+"&idrnd="+Math.random();

       

        xmlHttp=GetXmlHttpObject()

        if (xmlHttp==null)

        {

              alert ("Non AJAX!");

              return;

        }

        xmlHttp.onreadystatechange=GraphShow;

        xmlHttp.open("GET",url,true);

        xmlHttp.send(null);

  }

  function GraphShow()

  {

        if (xmlHttp.readyState==4)

        {

              var sadrzaj;

              sadrzaj=xmlHttp.responseText;

              document.getElementById("imgGrafikon").src = sadrzaj;

        }

  }

   
  In graphRender.aspx I have GDI+ procedure for rendering graph. It work for first time (when page is open) but when I click on some button to get other graph (for different parameters) I lose picture (get red x)

  Does anyone have some example for dynamically render GDI+ image using JavaScript (without UpdatePanel)

   

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  Chris Pebble

  Participant

  925 Points

  146 Posts

  Re: Ajax and GDI

  Mar 14, 2008 06:18 PM|LINK

  What you're doing should work. What value is sadrzaj being set to? Make sure the path that it is returning is a valid virtual or complete path.

  Unfortunately that's all the assist I can give without seeing the code in graphRender.aspx.

• • Reply
  

  zivko

  Member

  4 Points

  12 Posts

  Re: Ajax and GDI

  Apr 15, 2008 07:17 AM|LINK

  I solve it with another div tag in wich I loaded GDI object.

  • Marked as answer by zivko on Apr 15, 2008 07:18 AM