treeview and postback

Question

hi

I have a treeview, and already the javascript code to postback the page. Because when i select the father , auto-select the children.

this is my html code

<script>
                                function postBackCheckBox()
                                {
                                    var o = window.event.srcElement;
                                    if (o.tagName == 'INPUT' && o.type == 'checkbox' && o.name != null && o.name.indexOf('CheckBox') > -1)
                                    {
                                        __doPostBack('LinkButton1', '');
                                    }
                                }
                            </script>

                            <asp:UpdatePanel UpdateMode="Conditional" ID="UpdatePanel1" runat="server">
                                <ContentTemplate>
                                    <asp:TreeView ID="HierarchicalTreeView" runat="server" OnSelectedNodeChanged="HierarchicalTreeView_SelectedNodeChanged"
                                        ShowLines="True" ExpandImageToolTip="Fechar &quot;{0}&quot;" CollapseImageToolTip="Fechar &quot;{0}&quot;"
                                        ExpandDepth="1" OnTreeNodeCheckChanged="HierarchicalTreeView_TreeNodeCheckChanged"
                                        EnableClientScripts="true">
                                        <NodeStyle CssClass="text" />
                                        <SelectedNodeStyle CssClass="text" Font-Bold="true" />
                                    </asp:TreeView>
                                </ContentTemplate>
                                </asp:UpdatePanel>
                            <asp:LinkButton ID="LinkButton1" runat="server" Visible="false"></asp:LinkButton>

and in C#

HierarchicalTreeView.Attributes.Add("onclick", "postBackCheckBox()");
ScriptManager scripManager = (ScriptManager)Page.Master.FindControl("ScriptManagerMaster");
scripManager.RegisterAsyncPostBackControl(LinkButton1);

How can i prevent from postback all page, and only the treeview???, so dont 'refresh' the page

Answer 1

You need to use Ajax for this, e.g. place your treeview in UpdatePanel.

Try calling __dopostback function like this:

 __doPostBack('<%= LinkButton1.ClientID %>', '');

Answer 2

<asp:UpdatePanel UpdateMode="Conditional" ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <asp:TreeView ID="HierarchicalTreeView" runat="server" OnSelectedNodeChanged="HierarchicalTreeView_SelectedNodeChanged"
            ShowLines="True" ExpandImageToolTip="Fechar &quot;{0}&quot;" CollapseImageToolTip="Fechar &quot;{0}&quot;"
            ExpandDepth="10" 
            OnTreeNodeCheckChanged="HierarchicalTreeView_TreeNodeCheckChanged" 
            ontreenodeexpanded="HierarchicalTreeView_TreeNodeExpanded">
            <NodeStyle CssClass="text" />
            <SelectedNodeStyle CssClass="text" Font-Bold="true" />
        </asp:TreeView>                                                                     
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="buttonCheck" EventName="click" />
    </Triggers>
</asp:UpdatePanel>

<asp:button ID="buttonCheck" runat="server" CausesValidation="false" />

C# code

 buttonCheck.Attributes.CssStyle["visibility"] = "hidden";
            HierarchicalTreeView.Attributes.Add("onclick", string.Format("document.getElementById('{0}').click();", buttonCheck.ClientID));
            ScriptManager scripManager = (ScriptManager)Page.Master.FindControl("ScriptManagerMaster");
            scripManager.RegisterAsyncPostBackControl(buttonCheck);