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  • Category: .NET

    checkboxes in treeview

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    hi

    i have a dynamically generated treeview,which shows all the available books in a library.

    here different categories r parent nodes n books available in that particular category are child nodes.

    for selecting books,i want to add check boxes,only for child nodes ( not for category)

    if i select the 'checkbox' option,then i'll get check boxes even for parent nodes.

    any other suggestions/options for selecting books(child nodes)-(max of 4-books allowed)
    it should all the user to select 'n' books(here its 4)

    thanx in advance,
    shruthi
  • #472
    I believe there is a checkbox option even at the Node level. You could use that.

  • #1949
    hi,

    Try this method of coding.Since u bind data dynamically,u can allow checkbox only to nodes as follows.To get immediate action for the check of each checkbox set autopostback property of treeview to true.If u use separate button for the validation of
    checks no need of setting autopostback property.

    Dim newNode1 As TreeNode = New TreeNode()
    newNode1.Text = "hello"
    treeview1.Nodes.Add(newNode1)
    Dim newNode3 As TreeNode = New TreeNode()
    newNode3.Text = "hai"
    newNode3.CheckBox = True
    newNode1.Nodes.Add(newNode3)

    regards,

  • #219202
    TreeView Declaration

    <asp:TreeView ID="TreeView1" Runat="server" DataSourceID="XmlDataSource1" onclick="client_OnTreeNodeChecked();" ShowCheckBoxes="all">

    <DataBindings>

    <asp:TreeNodeBinding DataMember="Category" ValueField="ID" TextField="Name"></asp:TreeNodeBinding>

    <asp:TreeNodeBinding DataMember="Description" ValueField="Value" TextField="Value"></asp:TreeNodeBinding>

    </DataBindings>

    </asp:TreeView>




    The Javascript Code snippet is as follows:-

    <script language="javascript" type="text/javascript">
    function client_OnTreeNodeChecked()
    {
    var obj = window.event.srcElement;
    var treeNodeFound = false;
    var checkedState;
    if (obj.tagName == "INPUT" && obj.type == "checkbox") {
    var treeNode = obj;
    checkedState = treeNode.checked;
    do
    {
    obj = obj.parentElement;
    } while (obj.tagName != "TABLE")
    var parentTreeLevel = obj.rows[0].cells.length;
    var parentTreeNode = obj.rows[0].cells[0];
    var tables = obj.parentElement.getElementsByTagName("TABLE");
    var numTables = tables.length
    if (numTables >= 1)
    {
    for (i=0; i < numTables; i++)
    {
    if (tables[i] == obj)
    {
    treeNodeFound = true;
    i++;
    if (i == numTables)
    {
    return;
    }
    }
    if (treeNodeFound == true)
    {
    var childTreeLevel = tables[i].rows[0].cells.length;
    if (childTreeLevel > parentTreeLevel)
    {
    var cell = tables[i].rows[0].cells[childTreeLevel - 1];
    var inputs = cell.getElementsByTagName("INPUT");
    inputs[0].checked = checkedState;
    }
    else
    {
    return;
    }
    }
    }
    }
    }
    }
    </script>


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