ASTreeView – Get selected and checked nodes by javascript

by Weijie JIN on

One of the ASTreeView user submitted a request that he wants to get the selected and checked nodes on the client side.

The result will looks like:

image

Here’s the solution:

Get the selected node

1. Create a container for holding the text.( of course you need to change it to match your situation):

<asp:TextBox ID="txtSelectedNode" runat="server"></asp:TextBox>

2. Set the OnNodeSelectedScript of ASTreeView:

OnNodeSelectedScript="selectionHandler(elem);"

3. Implement the javascript method:

function selectionHandler(){
	var tempText = '';
	function tempOnSelectHandler(li){
		
		//if the node is selected
		if( li.getAttribute('selected') != 'true' )
			return;

		var a = li.getElementsByTagName('A')[0];
		if( !a )
			return;
		
		tempText += (a.innerHTML + ',');
		
	}
	
	//traverse the whole tree to get the selected node
	<%=this.astvMyTree.GetClientTreeObjectId() %>
			.traverseTreeNode( tempOnSelectHandler );

	if( tempText.length > 0 )
		tempText = tempText.substr( 0, tempText.length - 1 );

	//set the text to the textbox
	document.getElementById('<%=txtSelectedNode.ClientID %>')
			.value = tempText;
}

Get the checked nodes

1. Also create a container first:

<asp:TextBox ID="txtCheckedNodes" runat="server" Width="500" 
TextMode="MultiLine"></asp:TextBox>

2. Set the OnNodeCheckedScript property of ASTreeView:

OnNodeCheckedScript="checkHandler(elem);"

3. Implement the javascript method:

function checkHandler(){
	var tempText = '';
	function tempOnCheckedHandler(li){
		
		//change it to false if you don't want
		// the half-checked nodes included.
		var includeHalfChecked = true;
		if( li.getAttribute('checkedState') == '0' 
		|| ( li.getAttribute('checkedState') == '1' 
			&& includeHalfChecked ) ){
			var a = li.getElementsByTagName('A')[0];
			if( !a )
				return;
			tempText += (a.innerHTML + ',');
		}
	}
	
	//traverse the whole tree.
	<%=this.astvMyTree.GetClientTreeObjectId() %>
		.traverseTreeNode( tempOnCheckedHandler );

	if( tempText.length > 0 )
		tempText = tempText.substr( 0, tempText.length - 1 );
		
	//set the textbox
	document.getElementById('<%=txtCheckedNodes.ClientID %>')
				.value = tempText;

}

Sample download:

You can download the working sample here: http://www.jinweijie.com/download/GetSelectedCheckedNodesClientSideSample.zip

  • Akh

    how can i get the selected node value in the same function (selectionHandler)? thank you

  • Akh

    I fount it by myself ;)

  • Akh

    found*

  • http://jinweijie.myopenid.com/ jinweijie

    great!

    thanks!

  • Vasant

    Hi,

    How can I restrict user to drag and drop only most least-level nodes (which should not have childNodes under neath).

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