DataSource OnClick codebehind

5 posts, 1 answers
  1. Son
    Son avatar
    13 posts
    Member since:
    Sep 2013

    Posted 31 Aug Link to this post

    I changed something from demo example to my project and i use datasource in codebehind.  DataPager still works fine if i put RadListView datasource in PageLoad but DataPager doesn't work when i put RadListView datasource in event click of Button. Can you help me, please?

     - aspx:

    <telerik:RadButton ID="RadButton1" runat="server" Text="RadButton" OnClick="Button1_Click"></telerik:RadButton>
            <br />
            <div>
                        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
                    <AjaxSettings>
                        <telerik:AjaxSetting AjaxControlID="ListViewPanel1">
                            <UpdatedControls>
                                <telerik:AjaxUpdatedControl ControlID="ListViewPanel1" LoadingPanelID="RadAjaxLoadingPanel1"></telerik:AjaxUpdatedControl>
                            </UpdatedControls>
                        </telerik:AjaxSetting>
                    </AjaxSettings>
                </telerik:RadAjaxManager>
                <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" MinDisplayTime="0">
                </telerik:RadAjaxLoadingPanel>
                <asp:Panel ID="ListViewPanel1" runat="server">
                    <telerik:RadListView ID="RadListView1" Width="97%" AllowPaging="True" runat="server"
                        allowsorting="true" ItemPlaceholderID="ProductsHolder">
                        <LayoutTemplate>
                                <asp:Panel ID="ProductsHolder" runat="server">
                                </asp:Panel>
                                <table>
                                    <tr>
                                        <td>
                                            <telerik:RadDataPager RenderMode="Lightweight" ID="RadDataPager1" runat="server" PagedControlID="RadListView1"
                                                PageSize="6">
                                                <Fields>
                                                    <telerik:RadDataPagerButtonField FieldType="FirstPrev"></telerik:RadDataPagerButtonField>
                                                    <telerik:RadDataPagerButtonField FieldType="Numeric"></telerik:RadDataPagerButtonField>
                                                    <telerik:RadDataPagerButtonField FieldType="NextLast"></telerik:RadDataPagerButtonField>
                                                    <telerik:RadDataPagerPageSizeField PageSizeText="Page size: "></telerik:RadDataPagerPageSizeField>
                                                    <telerik:RadDataPagerGoToPageField CurrentPageText="Page: " TotalPageText="of" SubmitButtonText="Go"
                                                        TextBoxWidth="30"></telerik:RadDataPagerGoToPageField>
                                                    <telerik:RadDataPagerTemplatePageField>
                                                        <PagerTemplate>
                                                            <div style="float: right; line-height: 34px; margin-left: 10px;">
                                                                Items
                                                            <asp:Label runat="server" ID="CurrentPageLabel" Text="<%# Container.Owner.StartRowIndex+1%>"></asp:Label>
                                                                to
                                                            <asp:Label runat="server" ID="TotalPagesLabel" Text="<%# Container.Owner.TotalRowCount > (Container.Owner.StartRowIndex+Container.Owner.PageSize) ? Container.Owner.StartRowIndex+Container.Owner.PageSize : Container.Owner.TotalRowCount %>"></asp:Label>
                                                                of
                                                            <asp:Label runat="server" ID="TotalItemsLabel" Text="<%# Container.Owner.TotalRowCount%>"></asp:Label>
                                                                <br />
                                                            </div>
                                                        </PagerTemplate>
                                                    </telerik:RadDataPagerTemplatePageField>
                                                </Fields>
                                            </telerik:RadDataPager>
                                        </td>
                                    </tr>
                                </table>
                        </LayoutTemplate>
                        <ItemTemplate>
                             <table>
                                    <tr>
                                        <td style="width: 140px; text-align: left; height: 120px">
                                            <asp:Image ID="Img1" runat="server"
                                                ImageUrl='<%# Eval("_Image") %>' Height="100" Width="130" />
                                        </td>
                                        <td style="vertical-align: top; text-align: left">
                                            <asp:LinkButton runat="server" ID="Title" Font-Bold="true" CommandName="Select"
                                                Text='<%# Eval("_Title") %>'></asp:LinkButton>
                                            <asp:Label runat="server" ID="lblink" Font-Size="Small"
                                                Text='<%# Eval("_Link") %>' Visible="false" />
                                        </td>
                                    </tr>
                                </table>
                        </ItemTemplate>
                    </telerik:RadListView>  
                </asp:Panel>
              
                <asp:SqlDataSource ID="SqlDS" runat="server" ConnectionString="<%$ appSettings:sqlconn %>"
                    ProviderName="System.Data.SqlClient" ></asp:SqlDataSource>

     

    - aspx.cs work fine (don't use Button):

            protected void Page_Load(object sender, EventArgs e)
            {
                _News.NewsList("20", "", "08/20/2016", "08/30/2016", "0", "0", 0);
                RadListView1.DataSource = _News._znews;
                RadListView1.DataBind();
            }

    - aspx.cs DataPager doesn't work:

            protected void Page_Load(object sender, EventArgs e)

             {

            }
            protected void Button1_Click(object sender, EventArgs e)
            {
                _News.NewsList("20", "", "08/20/2016", "08/30/2016", "0", "0", 0);
                RadListView1.DataSource = _News._znews;
                RadListView1.DataBind();
            }

    Thanks. 

  2. Son
    Son avatar
    13 posts
    Member since:
    Sep 2013

    Posted 04 Sep Link to this post

    Excute me, more, because after clicked, i need reload ListView every 15 mins (Timepicker) without refreshing pager to 1, Do you have any idea? 

    Example in my picture, after 15', i can have options to keep it 'page 3' after refreshed or reload it to 'page1'

    (both listview and pager)

  3. UI for ASP.NET Ajax is Ready for VS 2017
  4. Son
    Son avatar
    13 posts
    Member since:
    Sep 2013

    Posted 05 Sep Link to this post

    Sorry, Maybe i'm wrong, the problem is not datapager, it's ajax manager :(

    - I read demo of RadAjaxManager, RadAjaxLoadingPanel but i don't understand all. 
    What displace UpdateMode, AutoPostBack, Update() in non-Rad controls? 

    - Example about Timer with RadAjaxManager is ok  but can i choose an option to reset to (page 1)?

  5. Answer
    Eyup
    Admin
    Eyup avatar
    3009 posts

    Posted 06 Sep Link to this post

    Hi Son,

    First of all, please note that using RadAjaxPanel simultaneously with RadAjaxManager or UpdatePanel ( or implementing multiple wrapped RadAjaxPanels ) is not a supported scenario and we highly recommend to avoid such implementation. Please replace the RadAjaxPanel with regular asp:Panel or remove the RadAjaxManager:
    http://www.telerik.com/help/aspnet-ajax/ajax-controls-in-ajaxpanel-and-ajaxsettings.html


    Also, when developing your applications, temporarily disable any AJAX on the page if present (RadAjaxManager, RadAjaxPanel, UpdatePanel, etc.) and enable your script debugger (FireBug or F12) to see whether there are any script or server errors interfering, and make sure that the application works without AJAX.


    Please note that performing complex list view operations such as Inserting, Deleting, Updating, Grouping, Paging, Sorting, Filtering, etc. require accommodating appropriate database operations. Therefore, we suggest you to avoid Simple Databinding (DataBind() method) and strongly recommend the use of more advanced databinding methods, which automatically handle the aforementioned functions:
      Declarative DataSource
      Advanced Data Binding
    (NeedDataSource event)


    As for ajaxifying Timer functionality, you can check the following live sample:
    http://demos.telerik.com/aspnet-ajax/ajaxmanager/application-scenarios/ajaxify-timer/defaultcs.aspx

    I hope this will prove helpful.

    Regards,
    Eyup
    Telerik by Progress
    Do you need help with upgrading your ASP.NET AJAX, WPF or WinForms projects? Check the Telerik API Analyzer and share your thoughts.
  6. Son
    Son avatar
    13 posts
    Member since:
    Sep 2013

    Posted 06 Sep Link to this post

    NeedDataSource without DataBind() is what i need. Thank you so much, Eyup.
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