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145
UltraWebTree ManualSmartCallback and Drag Drop
posted

Hello everyone,

 I have an Inftragistics tree control in my application that is configured to do load on demand with manualsmartcallbacks. I would also like to give my users the ability to drag and drop elements in the tree. After the drop has occured I add the dropped node as a child of the target node; after whice I use javascript to expand the target node.

Everything operates fine with one exception. Everytime I do a drag/drop, I notice that my browser (IE7) gets stuck loading something. The problem goes away once I expand/collapse any node in the tree. Unfortunatly if I don't do this before I try to do anything else on the tree (like delete a node), then I get a System.Data stack overflow exception. I know the problem exists with adding the node because if I remove that code the problem does away. Below is the drop event handler on my tree.

 

function uwtFolders_Drop(oTree, oNode, oDataTransfer, oEvent)

{         if (oNode.getTag() == null)

         {

                  oNode.setTag(oNode.getDataKey());

         }

        if (oDataTransfer.sourceObject.getTag() == null)

        {

                  oDataTransfer.sourceObject.setTag(oDataTransfer.sourceObject.getDataKey());

        }

        if (!oNode.isChildOf(oDataTransfer.sourceObject))

        {

                  //UpdateFolder(GetWorkspaceId(),oNode.getTag(),oDataTransfer.sourceObject.getTag(),oDataTransfer.sourceObject.getText());

 

                  var newNode = oNode.addChild('Test');

                  // newNode.setTag(oDataTransfer.sourceObject.getTag());

                  // MoveNodes(newNode,oDataTransfer.sourceObject);

                  oDataTransfer.sourceObject.remove();

                  //oNode.setExpanded(true);

       }

       return true;

}

And here is the tree:

 

<ignav:UltraWebTree id="uwtFolders" runat="server" Cursor="Default" ForeColor="Black" Font-Size="8pt"

Font-Names="Verdana" BorderColor="Pink" BorderStyle="None" Height="400px" Width="300px" Indentation="20"

WebTreeTarget="ClassicTree" LoadOnDemand="ManualSmartCallbacks" CompactRendering="False" EnableViewState="False"

SingleBranchExpand="True" DataKeyOnClient="true" AllowDrag="true" AllowDrop="true">

<SelectedNodeStyle ForeColor="Black" BackColor="#CCCCCC"></SelectedNodeStyle>

<Images>

<CollapseImage Url="./images/exp.gif" />

<ExpandImage Url="./images/col.gif" />

</Images>

<ClientSideEvents InitializeTree="uwtFolders_InitializeTree" NodeClick="uwtFolders_NodeClick" AfterNodeUpdate="uwtFolders_AfterNodeUpdate" Drop="uwtFolders_Drop"/>

</ignav:UltraWebTree>

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  • 145
    posted

    Bleh Ok NVM sorry about that last post. I figured out about 30 min after I made this post what I had done. The control has lot of ajax functionality so in order to maximize performance I make all the data calls I need for the folders in my explorer control and store that data in a persistant dataset. Any changes to the folder structure (updating folder names, changing the parent, adding/deleteing a folder) are saved to the database and then the changes are made to the indexed dataset. During one of those operations I was inadvertantly updateing the datasets "PARENT_FOLDER_ID" column to be the same ID of the folder I was working with. So, when I was trying to delete the folder and its children my application would just go into an infinite loop.

     Unfortunatly I completely missed this as I was in a mad rush to get the control (and serveral others) done and pushed out for a demonastration in a 3 day window. The browser showing that it would continually load after a drag drop was throwing my already fried brain into a spin. The continuous browser load still bothers me.

     Anyways thanks to anyone who looked at this thread attempting to help.

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