Code in VB.net that switches between two gridviews on a page automatically with the help of a timer

Question

Code in VB.net that switches between two gridviews on a page automatically with the help of a timer

There are 2 gridviews on a single aspx page, and I want the second gridview to be displayed after the first gridview for 5 seconds and vice versa automatically, without any manual intervention.

NOTE: This should happen on page load without clicking any buttons.

Currently, I am able to display the second gridview after 5 seconds of displaying the first gridview, but I'm unable to switch back to the first gridview automatically. I would appreciate your input on this issue!

<form id="form1" runat="server">
     <asp:ScriptManager ID="scriptManager1" runat="server"></asp:ScriptManager>

       <asp:Panel id="panel1" runat="server" Height="100%" Width="100%">
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BorderColor="Purple" BorderStyle="Double" CssClass="auto-style2" DataSourceID="SqlDataSource1" Font-Bold="True" Font-Names="Algerian" Font-Size="XX-Large" Height="1200px" OnRowDataBound="OnRowDataBound" Width="100%" HorizontalAlign="Center" PageSize="15">
            <Columns>
                <asp:BoundField DataField="ProjectName" HeaderText="Project Name" SortExpression="ProjectName" ItemStyle-CssClass="FrozenCell" HeaderStyle-CssClass="FrozenCell">
                <ControlStyle Font-Bold="False"   Font-Size="XX-Large" Font-Italic="True" Font-Names="Calibri" ForeColor="#FFFFDF"  />
                <HeaderStyle ForeColor="#FF9999" CssClass="FrozenCell" />
                <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Font-Bold="True" Font-Names="Calibri" Font-Size="XX-Large"  />
                </asp:BoundField>
                 <asp:BoundField DataField="ReqBy" HeaderText="Requested By" SortExpression="ReqBy">
                <ControlStyle Font-Bold="False" Font-Size="XX-Large" Font-Italic="True" Font-Names="Calibri" ForeColor="#FFFFDF" />
                <HeaderStyle ForeColor="#FF9999" />
                     <ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Font-Bold="True" Font-Names="Calibri" Font-Size="XX-Large" />
                </asp:BoundField>

				... (remaining code)

javascript asp.net vb.net

Answer 1

Answer №1

Below is an example you might find interesting to explore. It showcases a simple demonstration of how a certain functionality could be implemented.

EXAMPLE

https://i.sstatic.net/rKwRs.gif

Snippet Showcase

Representation

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick"></asp:Timer>
        <div style="display: flex;">
            <div style="margin-right: 20px;">
                <h4>GridView1</h4>
                <asp:GridView ID="GridView1" runat="server"></asp:GridView>
            </div>
            <div>
                <h4>GridView2</h4>
                <asp:GridView ID="GridView2" runat="server"></asp:GridView>
            </div>
        </div>
        <asp:HiddenField ID="HiddenField1" runat="server" />
        <div style="height: 200px; overflow-x: auto; margin-top: 10px;">
            <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

Visual Basic Code

Private Property gridNumber As Integer
    Get

        If Not IsPostBack Or String.IsNullOrEmpty(HiddenField1.Value) Then
            HiddenField1.Value = 1.ToString()
        End If

        Return Integer.Parse(HiddenField1.Value)
    End Get
    Set(ByVal value As Integer)
        HiddenField1.Value = value.ToString()
    End Set
End Property

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindGrid(1)
        BindGrid(2)
        Timer1.Enabled = True
        Timer1.Interval = 1000
    End If
End Sub

Protected Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs)
    BindGrid(gridNumber)
    Dim colorCode As String = If(gridNo = 1, "green", "blue")
    Label1.Text = String.Format("<span style='margin-bottom: 5px; display: block;color:" & textColor & "'>GridView{0}.DataBind()</span>", gridNo)
    gridNumber = If(gridNumber = 1, 2, 1)
End Sub

Private Sub BindGrid(ByVal gridNumber As Integer)
    Select Case gridNumber
        Case 1
            GridView1.DataSource = Enumerable.Range(1, 3).Select(Function(x) New With {
                Key .CurrentTime = DateTime.Now.AddHours(x).TimeOfDay
            })
            GridView1.DataBind()
        Case 2
            GridView2.DataSource = Enumerable.Range(1, 3).Select(Function(x) New With {
                Key .CurrentTime = DateTime.Now.AddHours(x).TimeOfDay
            })
            GridView2.DataBind()
    End Select

Answer 2

Below is an example you might find interesting to explore. It showcases a simple demonstration of how a certain functionality could be implemented.

EXAMPLE

https://i.sstatic.net/rKwRs.gif

Snippet Showcase

Representation

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick"></asp:Timer>
        <div style="display: flex;">
            <div style="margin-right: 20px;">
                <h4>GridView1</h4>
                <asp:GridView ID="GridView1" runat="server"></asp:GridView>
            </div>
            <div>
                <h4>GridView2</h4>
                <asp:GridView ID="GridView2" runat="server"></asp:GridView>
            </div>
        </div>
        <asp:HiddenField ID="HiddenField1" runat="server" />
        <div style="height: 200px; overflow-x: auto; margin-top: 10px;">
            <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

Visual Basic Code

Private Property gridNumber As Integer
    Get

        If Not IsPostBack Or String.IsNullOrEmpty(HiddenField1.Value) Then
            HiddenField1.Value = 1.ToString()
        End If

        Return Integer.Parse(HiddenField1.Value)
    End Get
    Set(ByVal value As Integer)
        HiddenField1.Value = value.ToString()
    End Set
End Property

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindGrid(1)
        BindGrid(2)
        Timer1.Enabled = True
        Timer1.Interval = 1000
    End If
End Sub

Protected Sub Timer1_Tick(ByVal sender As Object, ByVal e As EventArgs)
    BindGrid(gridNumber)
    Dim colorCode As String = If(gridNo = 1, "green", "blue")
    Label1.Text = String.Format("<span style='margin-bottom: 5px; display: block;color:" & textColor & "'>GridView{0}.DataBind()</span>", gridNo)
    gridNumber = If(gridNumber = 1, 2, 1)
End Sub

Private Sub BindGrid(ByVal gridNumber As Integer)
    Select Case gridNumber
        Case 1
            GridView1.DataSource = Enumerable.Range(1, 3).Select(Function(x) New With {
                Key .CurrentTime = DateTime.Now.AddHours(x).TimeOfDay
            })
            GridView1.DataBind()
        Case 2
            GridView2.DataSource = Enumerable.Range(1, 3).Select(Function(x) New With {
                Key .CurrentTime = DateTime.Now.AddHours(x).TimeOfDay
            })
            GridView2.DataBind()
    End Select

Answer 3

Answer №2

Avoid relying on a VB timer for this task.

Using a VB timer will require you to constantly reconstruct the grid data and go through a complete HTTP request/response cycle with each tick. It is better to utilize JavaScript to switch between grids that have already been rendered on the same HTML page.

You can easily switch between the grids by incorporating a slideshow or carousel script within the container div.

Answer 4

Avoid relying on a VB timer for this task.

Using a VB timer will require you to constantly reconstruct the grid data and go through a complete HTTP request/response cycle with each tick. It is better to utilize JavaScript to switch between grids that have already been rendered on the same HTML page.

You can easily switch between the grids by incorporating a slideshow or carousel script within the container div.

Code in VB.net that switches between two gridviews on a page automatically with the help of a timer

Answer №1

Answer №2

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