WebDataTree | Infragistics Forums

WebDataTree

Karthik Thangavel posted over 6 years ago

Hi,

I am using WebDataTree control and adding nodes to the tree instead of Xml DataBind. Also implemented Load on Demand concept using

the below logic.

this.TreeControl.NodeBound += new DataTreeNodeEventHandler(TreeControl_NodeBound);
this.TreeControl.NodePopulate += new DataTreeNodeEventHandler(TreeControl_NodePopulate);

Data loads fine for first time and when I try to expand nodes, it showing "Server does not respond" on hosting machine. If I refresh the page, expanding nodes are just working fine.

In debug mode, it showing "async failed"

Tree Expand Issue

Tree Expand 2

Server Tag:

 <ig:WebDataTree ID="TreeControl" runat="server" Visible="true" Height="100%" ForeColor="Black" EnableConnectorLines="true" EnableAjaxViewState="true">
                 <ClientEvents  
    			            NodeClick="nodeClick"
			                NodeExpanding="nodeExpand" 
                            NodeCollapsing="nodeCollapse"       
                               Initialize="InitializeHandler"
                            /> 
                </ig:WebDataTree>

Thanks,

Karthik Thangavel.

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Offline Milko Venkov posted over 6 years ago in reply to Karthik Thangavel +1 verified
Sample_02.zip Hello Karthik, Thank you for your feedback. Please find bellow answers to your questions: That is ok. Please lets focus on WebDataTree;...view reply »

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Offline Milko Venkov posted over 6 years ago

Hello Karthik,

If I understand you correctly you have some type of data source and you are adding nodes to the WebDataTree by yourself. Additionally you need to implement load on demand for the child nodes. If this is what you need please follow the next link to a WebDataTree samples where we show how you can “Manual Load On Demand” nodes to WebDataTree.

Please let me know if this solves your issue, or if you need any further assistance on this matter.
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Offline Karthik Thangavel posted over 6 years ago in reply to Milko Venkov

Hi Milko,

Thanks for your reply ! I have already worked out the sample and its working fine.

1. I am trying to convert the Infragistics UltraWebTree to latest WebDataTree.
2. In UltraWebTree, loadondemand="manualsmartcallbacks" handles Ajax request.
3. In WebDataTree, there is inbuilt ajax functions as per the documentation.
4. In our project, we using override ProcessRequest function to handle authentication and permission.

public override void ProcessRequest(System.Web.HttpContext )
{
//Check for authentication
    base.ProcessRequest(context);
}

5. First level nodes are loaded and when expanding a child node on a tree, base.ProcessRequest(context); runs, it throwing the error (Async request failed).

6. This error not occured with UltraWebTree. See the below for design source.

UltraWebTree:

<ignav:ultrawebtree 
		id="TreeControl" 
		runat="server" 
		webtreetarget="ClassicTree" 
		loadondemand="manualsmartcallbacks" 
		compactrendering="False" 
		enableviewstate="true" 
		singlebranchexpand="false"
		>
		<clientsideevents 
			nodeclick="nodeClick" 
			nodeexpand="nodeExpand" 
			nodecollapse="nodeCollapse"
			dragstart="dragStart" 
			drop="drop" 
			dragover="dragOver" />
	</ignav:ultrawebtree>

WebDataTree:

<ig:WebDataTree ID="TreeControl" runat="server" InitialExpandDepth="0" EnableExpandOnClick="true"
                        InitialDataBindDepth="0" EnableAjax="true" 
                        SingleBranchExpandLevel="0"
                        SelectionType="Single" Visible="true" Height="100%" 
       ForeColor="Black" EnableConnectorLines="true" OnNodePopulate="TreeControl_NodePopulate" 
       OnNodeBound="TreeControl_NodeBound"        
       >

            <AutoPostBackFlags SelectionChanged="Async" />
            <ClientEvents  
    			NodeClick="nodeClick"
			    NodeExpanding="nodeExpand" 
                NodeCollapsing="nodeCollapse"       
                   Initialize="InitializeHandler"
                /> 
</ig:WebDataTree>

Thanks.

Karthik Thangavel.