ASPxNavBar.AutoCollapse Property

Gets or sets a value specifying whether only one group can be expanded at a time within the NavBar.

Assembly: DevExpress.Web.v18.2.dll

Declaration

C#
VB.NET

[DefaultValue(false)]
public bool AutoCollapse { get; set; }

<DefaultValue(False)>
Public Property AutoCollapse As Boolean

Property Value

Type	Default	Description
Boolean	false	true if only one group can be expanded within the navbar control; false if the navbar can have multiple groups expanded simultaneously.

Remarks

Use the AutoCollapse property to control the ability of the navbar control to automatically collapse any previously expanded group when an end-user expands a new group.

End users are able to expand groups by clicking on the group expand button button or group header. If the AutoCollapse property is set to false (the default behavior) end users can expand several groups within the navbar control.

Set the AutoCollapse property to true to apply the auto collapse feature to the navbar control, thus forcing it to have only one group expanded at a time. In this instance, expanding a group collapses any other expanded group within the navbar. Note that the expanded group cannot be collapsed either by the end-user interface or programmatically. This can only be achieved by expanding another group.

Applying the auto collapse feature to a navbar control that has several groups currently expanded sets the first group from the ASPxNavBar.Groups collection to the expanded state and closes any other group.

Example

The example demonstrates how to create the ASPxNavBar groups and items at runtime to create a FAQ page.

Data can be obtained from any type of a datasource. For example, the data can be obtained from the Access database file using the OLE DB provider.The sample was built from the kindly provided How to use the ASPxNavBar with an Access or SQL datasource suggestion article, containing the URL to the tutorial video file.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-create-the-faq-page-using-the-aspxnavbar-e2342

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="DevExpress.Web.v13.2, Version=13.2.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxNavBar" TagPrefix="dx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to create the FAQ Page using the ASPxNavBar</title>
    <style type="text/css">
        .heading {
            font-size: large;
            color: Blue;
        }

        .Question {
            color: Gray;
            font-size: 11pt;
        }

            .Question img {
                vertical-align: middle;
            }

            .Question span {
                vertical-align: middle !important;
            }

        .Answer {
            font-size: 11pt;
            padding-left: 35px !important;
            padding-top: 8px;
            padding-bottom: 8px;
        }

        .defaultStyle {
            padding-left: 0px;
            list-style-type: none;
            margin: 0px;
        }
        .groupPadding {
            padding-left:0px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
        <div style="min-height: 500px;">
            <div class="heading">
                Frequently Asked Questions
            </div>
            <div style="padding-left: 10px; padding-top: 10px;">
                <dx:ASPxNavBar ID="navFAQ" runat="server" ExpandButtonPosition="Left"
                    AutoCollapse="True" GroupSpacing="5px" EncodeHtml="False" CssPostfix="None" CssClass="defaultStyle">
                    <GroupHeaderStyle CssClass="Question" ImageSpacing="8px">
                    </GroupHeaderStyle>
                    <CollapseImage Url="~/Images/nbCollapse.png">
                    </CollapseImage>
                    <ExpandImage Url="~/Images/nbExpand.png">
                    </ExpandImage>
                    <ItemStyle CssClass="Answer defaultStyle" />
                    <GroupContentStyle CssClass="groupPadding"></GroupContentStyle>
                </dx:ASPxNavBar>
            </div>
        </div>
    </form>
</body>
</html>

using System;
using System.Configuration;
using System.Data.OleDb;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, System.EventArgs e)
    {
        if (!IsPostBack) {
            Load_FAQ();
        }
    }

    public void Load_FAQ()
    {
        string SQL = "SELECT [Sort], [Question], [Answer] FROM [FAQ] ORDER BY [Sort], [Question]";
        string Question = null;
        string Answer = null;
        int i = 0;
        OleDbConnection conn = new OleDbConnection(ConfigurationManager.ConnectionStrings["DB_Conn_FAQ"].ConnectionString);
        OleDbCommand SelectCommand = new OleDbCommand(SQL, conn);
        try {
            conn.Open();
            OleDbDataReader Reader = SelectCommand.ExecuteReader();
            while (Reader.Read()) {
                if (Reader.HasRows) {
                    Question = Reader["Question"].ToString();
                    Answer = Reader["Answer"].ToString();
                    navFAQ.Groups.Add(Question);
                    navFAQ.Groups[i].Items.Add(Answer);
                }
                i += 1;
            }
        } catch (Exception ex) {
        } finally {
            conn.Close();
            conn.Dispose();
            SelectCommand.Dispose();
        }
    }
}

<%@ Page Language="vb" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<%@ Register Assembly="DevExpress.Web.v13.2, Version=13.2.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxNavBar" TagPrefix="dx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to create the FAQ Page using the ASPxNavBar</title>
    <style type="text/css">
        .heading {
            font-size: large;
            color: Blue;
        }

        .Question {
            color: Gray;
            font-size: 11pt;
        }

            .Question img {
                vertical-align: middle;
            }

            .Question span {
                vertical-align: middle !important;
            }

        .Answer {
            font-size: 11pt;
            padding-left: 35px !important;
            padding-top: 8px;
            padding-bottom: 8px;
        }

        .defaultStyle {
            padding-left: 0px;
            list-style-type: none;
            margin: 0px;
        }
        .groupPadding {
            padding-left:0px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
        <div style="min-height: 500px;">
            <div class="heading">
                Frequently Asked Questions
            </div>
            <div style="padding-left: 10px; padding-top: 10px;">
                <dx:ASPxNavBar ID="navFAQ" runat="server" ExpandButtonPosition="Left"
                    AutoCollapse="True" GroupSpacing="5px" EncodeHtml="False" CssPostfix="None" CssClass="defaultStyle">
                    <GroupHeaderStyle CssClass="Question" ImageSpacing="8px">
                    </GroupHeaderStyle>
                    <CollapseImage Url="~/Images/nbCollapse.png">
                    </CollapseImage>
                    <ExpandImage Url="~/Images/nbExpand.png">
                    </ExpandImage>
                    <ItemStyle CssClass="Answer defaultStyle" />
                    <GroupContentStyle CssClass="groupPadding"></GroupContentStyle>
                </dx:ASPxNavBar>
            </div>
        </div>
    </form>
</body>
</html>

Imports System.Data.OleDb

Partial Public Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        If Not IsPostBack Then
            Load_FAQ()
        End If
    End Sub

    Public Sub Load_FAQ()
        Dim SQL As String = "SELECT [Sort], [Question], [Answer] FROM [FAQ] ORDER BY [Sort], [Question]"
        Dim Question As String = Nothing
        Dim Answer As String = Nothing
        Dim i As Integer = 0
        Dim conn As New OleDbConnection(ConfigurationManager.ConnectionStrings("DB_Conn_FAQ").ConnectionString)
        Dim SelectCommand As New OleDbCommand(SQL, conn)
        Try
            conn.Open()
            Dim Reader As OleDbDataReader = SelectCommand.ExecuteReader()
            Do While Reader.Read()
                If Reader.HasRows Then
                    Question = Reader("Question").ToString()
                    Answer = Reader("Answer").ToString()
                    navFAQ.Groups.Add(Question)
                    navFAQ.Groups(i).Items.Add(Answer)
                End If
                i += 1
            Loop
        Catch ex As Exception
        Finally
            conn.Close()
            conn.Dispose()
            SelectCommand.Dispose()
        End Try
    End Sub
End Class

Controls

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Controls

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Controls and Extensions

Tools

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ASPxNavBar.AutoCollapse Property

Declaration

Property Value

Remarks

Example