Event to be fired on expanding the parent node in a tree panel.

  1. #1

    Event to be fired on expanding the parent node in a tree panel.

    Hello All,

    Can anyone tell me what event to be fired when the node is expanded.
    Initially I would be binding only the first level nodes on page load. I would want the child levels to be bound only on expanding the nodes. I tried events like : BeforeExpand, Expand, AfterItemExpand. But it didn't work.
  2. #2
  3. #3
    hanks Daniil,

    BeforeLoad event did work for me. But I am also using drag and drop functionality.
    If I drag and drop a row before expanding the node, the row is not binding.
    But if a drag and drop a row on an already expanded folder then it works.

    I am using direct method approach to bind the node in the code behind.

    I want the logic inside BeforeDrop event of a treeview to be done after the functionality inside BeforeLoad event is done. How do I do that.


       <View>
                        <ext:TreeView ID="TreeView1" runat="server">
                            <Plugins>
                                <ext:TreeViewDragDrop ID="TreeViewDragDrop1" runat="server" DragGroup="tree2grid" DropGroup="grid2tree" />
                            </Plugins>
                            <Listeners>
                                
                                <BeforeDrop Fn="beforerecorddrop" />
                            </Listeners>
                        </ext:TreeView>
                    </View>
  4. #4
    Could you, please, provide a full test case and exact steps to reproduce the issue?
  5. #5
    Hi Daniil, Please find the test case below:

    The child nodes of the tree grid are loaded only when the parent node is clicked. Now the user directly drags and drops a value from the above grid on a closed folder in the tree grid. Then the the value is not moved.
    But it works when the data is dragged and dropped on a folder which is already opened.

    <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CustomToDaniil.aspx.cs" Inherits="Honeywell.Ap3.WebApp.Pages.Views.CustomToDaniil" %>
    
    <%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
    <!DOCTYPE html>
    
    <script runat="server">
        private object[] TestData
        {
            get
            {
                DateTime now = DateTime.Now;
    
                return new object[]
                {
                    new object[] { "3m Co", 71.72, 0.02, 0.03, now },
                    new object[] { "Alcoa Inc", 29.01, 0.42, 1.47, now },
                    new object[] { "Altria Group Inc", 83.81, 0.28, 0.34, now },
                    new object[] { "American Express Company", 52.55, 0.01, 0.02, now },
                    new object[] { "American International Group, Inc.", 64.13, 0.31, 0.49, now },
                    new object[] { "AT&T Inc.", 31.61, -0.48, -1.54, now },
                    new object[] { "Boeing Co.", 75.43, 0.53, 0.71, now },
                    new object[] { "Caterpillar Inc.", 67.27, 0.92, 1.39, now },
                    new object[] { "Citigroup, Inc.", 49.37, 0.02, 0.04, now },
                    new object[] { "E.I. du Pont de Nemours and Company", 40.48, 0.51, 1.28, now },
                    new object[] { "Exxon Mobil Corp", 68.1, -0.43, -0.64, now },
                    new object[] { "General Electric Company", 34.14, -0.08, -0.23, now },
                    new object[] { "General Motors Corporation", 30.27, 1.09, 3.74, now },
                    new object[] { "Hewlett-Packard Co.", 36.53, -0.03, -0.08, now },
                    new object[] { "Honeywell Intl Inc", 38.77, 0.05, 0.13, now },
                    new object[] { "Intel Corporation", 19.88, 0.31, 1.58, now },
                    new object[] { "International Business Machines", 81.41, 0.44, 0.54, now },
                    new object[] { "Johnson & Johnson", 64.72, 0.06, 0.09, now },
                    new object[] { "JP Morgan & Chase & Co", 45.73, 0.07, 0.15, now },
                    new object[] { "McDonald\"s Corporation", 36.76, 0.86, 2.40, now },
                    new object[] { "Merck & Co., Inc.", 40.96, 0.41, 1.01, now },
                    new object[] { "Microsoft Corporation", 25.84, 0.14, 0.54, now },
                    new object[] { "Pfizer Inc", 27.96, 0.4, 1.45, now },
                    new object[] { "The Coca-Cola Company", 45.07, 0.26, 0.58, now },
                    new object[] { "The Home Depot, Inc.", 34.64, 0.35, 1.02, now },
                    new object[] { "The Procter & Gamble Company", 61.91, 0.01, 0.02, now },
                    new object[] { "United Technologies Corporation", 63.26, 0.55, 0.88, now },
                    new object[] { "Verizon Communications", 35.57, 0.39, 1.11, now },
                    new object[] { "Wal-Mart Stores, Inc.", 45.45, 0.73, 1.63, now }
                };
            }
        }
    
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!X.IsAjaxRequest)
            {
                this.Store1.DataSource = this.TestData;
                this.Store1.DataBind();
            }
        }
    
        [DirectMethod]
        public static string NodeLoad(string nodeID)
        {
            NodeCollection nodes = new Ext.Net.NodeCollection();
    
            if (!string.IsNullOrEmpty(nodeID))
            {
                for (int i = 1; i < 6; i++)
                {
                    Node asyncNode = new Node();
                    asyncNode.Text = nodeID + i;
                    asyncNode.NodeID = nodeID + i;
                    nodes.Add(asyncNode);
                }
    
                for (int i = 6; i < 11; i++)
                {
                    Node treeNode = new Node();
                    treeNode.Text = nodeID + i;
                    treeNode.NodeID = nodeID + i;
                    treeNode.Leaf = true;
                    nodes.Add(treeNode);
                }
            }
    
            return nodes.ToJson();
        }
    </script>
    
    <!DOCTYPE html>
    
    <html>
    <head id="Head1" runat="server">
        <title>Drag and Drop from GridPanel to TreePanel - Ext.NET Examples</title>
    
        <link href="/resources/css/examples.css" rel="stylesheet" />
    
        <script>
            var beforerecorddrop = function (node, data, overModel, dropPosition, dropFn) {
                if (Ext.isArray(data.records)) {
                    var records = data.records,
                        rec;
    
                    data.records = [];
    
                    for (var i = 0; i < records.length; i++) {
                        rec = records[i];
    
                        data.records.push({
                            text: rec.get("company"),
                            leaf: true,
                            price: rec.get("price"),
                            change: rec.get("change"),
                            pctChange: rec.get("pctChange"),
                            qtip: rec.get("lastChange")
                        });
    
                        rec.stores[0].remove(rec);
                    }
    
                    return true;
                }
            };
    
            var beforenodedrop = function (node, data, overModel, dropPosition, dropFn) {
                if (Ext.isArray(data.records)) {
                    var records = data.records,
                        rec;
    
                    data.records = [];
    
                    for (var i = 0; i < records.length; i++) {
                        rec = records[i];
    
                        data.records.push(this.store.createModel({
                            company: rec.get("text"),
                            price: rec.get("price"),
                            change: rec.get("change"),
                            pctChange: rec.get("pctChange"),
                            lastChange: rec.get("qtip")
                        }));
    
                        rec.remove(true);
                    }
    
                    return true;
                }
            };
    
            var nodeLoad = function (store, operation, options) {
                var node = operation.node;
    
                App.direct.NodeLoad(node.getId(), {
                    success: function (result) {
                        node.set('loading', false);
                        node.set('loaded', true);
                        var data = Ext.decode(result);
                        node.appendChild(data, undefined, true);
                        node.expand();
                    },
    
                    failure: function (errorMsg) {
                        Ext.Msg.alert('Failure', errorMsg);
                    }
                });
    
                return false;
            };
        </script>
    </head>
    <body>
        <form id="Form1" runat="server">
            <ext:ResourceManager ID="ResourceManager1" runat="server" />
    
            <ext:Panel ID="Panel1"
                runat="server"
                Width="700"
                Height="800"
                Layout="BorderLayout">
                <Items>
                    <ext:GridPanel ID="GridPanel1"
                        runat="server"
                        Region="North"
                        Title="Grid"
                        MultiSelect="true"
                        Margins="5 0 5 5">
                        <Store>
                            <ext:Store
                                ID="Store1"
                                runat="server">
                                <Model>
                                    <ext:Model ID="Model1" runat="server">
                                        <Fields>
                                            <ext:ModelField Name="company" />
                                            <ext:ModelField Name="price" Type="Float" />
                                            <ext:ModelField Name="change" Type="Float" />
                                            <ext:ModelField Name="pctChange" Type="Float" />
                                            <ext:ModelField Name="lastChange" Type="Date" />
                                        </Fields>
                                    </ext:Model>
                                </Model>
                            </ext:Store>
                        </Store>
                        <ColumnModel ID="ColumnModel1" runat="server">
                            <Columns>
                                <ext:Column ID="Column1"
                                    runat="server"
                                    Text="Company"
                                    Sortable="true"
                                    DataIndex="company"
                                    Flex="1" />
                                <ext:Column ID="Column2"
                                    runat="server"
                                    Text="Price"
                                    Width="75"
                                    Sortable="true"
                                    DataIndex="price">
                                    <Renderer Format="UsMoney" />
                                </ext:Column>
                            </Columns>
                        </ColumnModel>
                        <View>
                            <ext:GridView ID="GridView1" runat="server">
                                <Plugins>
                                    <ext:GridDragDrop ID="GridDragDrop1" runat="server" DragGroup="grid2tree" DropGroup="tree2grid" />
                                </Plugins>
                                <Listeners>
                                    <BeforeDrop Fn="beforenodedrop" />
                                </Listeners>
                            </ext:GridView>
                        </View>
                    </ext:GridPanel>
    
                    <ext:TreePanel
                        ID="TreePanel1"
                        runat="server"
                        Title="Tree"
                        Width="300"
                        Height="450"
                        Border="false" Region="South">
                        <Root>
                            <ext:Node NodeID="0" Text="Root" />
                        </Root>
                        <Listeners>
                            <BeforeLoad Fn="nodeLoad" />
                        </Listeners>
                        <SelectionModel>
                            <ext:TreeSelectionModel ID="TreeSelectionModel1" runat="server" />
                        </SelectionModel>
                        <View>
                            <ext:TreeView ID="TreeView1" runat="server">
                                <Plugins>
                                    <ext:TreeViewDragDrop ID="TreeViewDragDrop1" runat="server" DragGroup="tree2grid" DropGroup="grid2tree" />
                                </Plugins>
                                <Listeners>
                                    <%-- <Drop Fn="beforerecorddrop"></Drop>--%>
                                    <BeforeDrop Fn="beforerecorddrop" />
                                </Listeners>
                            </ext:TreeView>
                        </View>
                    </ext:TreePanel>
                </Items>
            </ext:Panel>
        </form>
    </body>
    </html>
  6. #6
    Thank you for the test case. Yes, that is a problem in Ext.NET v2.

    Basing on this Sencha forum post I can say that it should be fixed in Ext.NET 3 which is based on ExtJS 4.
    https://www.sencha.com/forum/showthr...l=1#post906736

    So, is there a specific reason to use Ext.NET v2 rather than v3?

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