Die Steuer RadListView keinen Artikel Platzhalter haben

Question

angegeben

den Code:

<telerik:RadListView ID="RadListView1" Width="100%" AllowPaging="True" runat="server" 
      Skin="Metro" allowsorting="true" ItemPlaceholderID="ProductsHolder" DataKeyNames="Product_ID" GroupPlaceholderID="CategoryHolder" 
      GroupItemCount="4" > 
      <GroupTemplate> 
       <fieldset style="float: left; width: 330px; margin-right: 15px;"> 
        <legend><%#Eval("CATEGORY_NAME") %></legend> 
        <table> 
         <tr> 
          <td> 
           <asp:Panel ID="CategoryHolder" runat="server"></asp:Panel> 

          </td> 
         </tr> 
        </table> 
       </fieldset> 


      </GroupTemplate> 

      <LayoutTemplate> 
       <fieldset style="width: 100%; margin: 0 auto; border: none;" id="FieldSet1"> 
        <telerik:RadDataPager ID="RadDataPager2" runat="server" PagedControlID="RadListView1" 
         Visible='<%# Container.PageCount != 1%>' Skin="Metro" PageSize="52"> 
         <Fields> 
          <telerik:RadDataPagerButtonField FieldType="FirstPrev" FirstButtonText="First" PrevButtonText="Prev" 
           HorizontalPosition="LeftFloat" /> 
          <telerik:RadDataPagerButtonField FieldType="Numeric" /> 
          <telerik:RadDataPagerButtonField FieldType="NextLast" NextButtonText="Next" LastButtonText="Last" 
           HorizontalPosition="RightFloat" /> 
         </Fields> 
        </telerik:RadDataPager> 
        <br /> 
        <asp:Panel ID="ProductsHolder" runat="server"> 
        </asp:Panel> 
        <table cellpadding="0" cellspacing="4" width="100%;" style="clear: both;"> 
         <tr> 
          <td> 
           <telerik:RadDataPager ID="RadDataPager1" runat="server" PagedControlID="RadListView1" 
            Visible='<%# Container.PageCount != 1%>' Skin="Metro" PageSize="52"> 
            <Fields> 
             <telerik:RadDataPagerButtonField FieldType="FirstPrev" FirstButtonText="First" PrevButtonText="Prev" 
              HorizontalPosition="LeftFloat" /> 
             <telerik:RadDataPagerButtonField FieldType="Numeric" HorizontalPosition="NoFloat" /> 
             <telerik:RadDataPagerButtonField FieldType="NextLast" NextButtonText="Next" LastButtonText="Last" 
              HorizontalPosition="RightFloat" /> 
            </Fields> 
           </telerik:RadDataPager> 
          </td> 
         </tr> 
        </table> 
       </fieldset> 
      </LayoutTemplate> 
      <EmptyDataTemplate> 
       <div style="width: 100%; text-align: center;"> 
        <b>No Results Found</b></div> 
      </EmptyDataTemplate> 
      <ItemTemplate> 
       <div style="float: left; padding-bottom: 20px; padding-left: 10px; padding-right: 10px;"> 
        <div class="CardItem" style="margin: auto !important;"> 
         <div class="cardDisplay"> 
          <img src="../App_Themes/VivaTheme/images/loading_big.gif" alt="" onerror="javascript:this.onerror = null;this.src='../images/Orders/VivaNotAvailable.jpg';" 
           onload="RetrievePicture(this,'<%# Eval("PRODUCT_ID")%>');" class="lof-image" 
           width="180" height="117" style="margin-bottom: 5px;" /> 
         </div> 
         <div class="points"> 
          <%# DataBinder.Eval(Container.DataItem, "SALES_PRICE", "{0:###,###,###,##0.00}") + " " + Eval("CURRENCY_ABREVIATION")%> 
         </div> 
         <hr class="fleft" style="border: 1px solid #D9E1E3; width: 195px;" /> 
         <div class="CardItemDesc"> 
          <table width="100%" style="display: inline-block;"> 
           <tr> 
            <td> 
             <%# Eval("PRODUCT_NAME")%> 
            </td> 
           </tr> 
           <tr> 
            <td> 
             <telerik:RadRating ID="RadRating1" Skin="Metro" runat="server" Enabled="false" Value='<%# Double.Parse(Eval("SALES_PRICE").ToString()) % 3 +2 %>'> 
             </telerik:RadRating> 
            </td> 
           </tr> 
           <tr> 
            <td> 
             <img src="../images/Orders/AddToCart.png" alt="Add to Cart" height="23" onclick="AddToCart(this, '<%# Eval("PRODUCT_NAME")%>', '<%# Eval("SALES_PRICE") %>', '<%# Eval("CURRENCY_ABREVIATION") %>', '<%# (Eval("UNIT_SYMBOL").ToString()=="K" ? "Kg" : (Eval("UNIT_SYMBOL").ToString() == "U" ? "Pc" : Eval("UNIT_SYMBOL"))) %>', '<%# Eval("PRODUCT_ID") %>', '<%# Telepaty.SecurityHelper.StringEncryptorDecryptor.Instance.EncryptString(Eval("PRODUCT_ID").ToString()) %>');return false;" 
              class="Clickable fleft" /> 
             <% if (LoggedClient.Current != null) 
              { %> 
             <img src="../images/Orders/BuyNow.png" alt="Buy Now" style="padding-left: 30px;" 
              height="23" onclick="javascript:window.location='Checkout.aspx?pID=<%# Telepaty.SecurityHelper.StringEncryptorDecryptor.Instance.EncryptString(Eval("PRODUCT_ID").ToString()) %>';return false;" 
              class="Clickable fright" /> 
             <% } 
              else 
              { %> 
             <img src="../images/Orders/BuyNow.png" alt="Buy Now" style="padding-left: 30px;" 
              height="23" onclick="javascript:window.location='/Login.aspx?ref=anonym&pID=<%# Telepaty.SecurityHelper.StringEncryptorDecryptor.Instance.EncryptString(Eval("PRODUCT_ID").ToString()) %>';return false;" 
              class="Clickable fright" /> 
             <% }; %> 
            </td> 
           </tr> 
          </table> 
         </div> 
        </div> 
       </div> 
      </ItemTemplate> 
     </telerik:RadListView> 

Server-Seite:

protected void Page_Load(object sender, EventArgs e) 
{ 
     if (!IsPostBack) 
    { 
     RadListView1.DataSource = OrderDataHelper.GetProductByCategoryforGrouping(); 
     RadListView1.DataBind(); 
    } 
} 

Die RadListView Kontrolle kein Element Platzhalter jemand wissen angegeben hat, warum dieses Problem aufgetreten ?

Answer 1

Sie setzen ItemPlaceholderID="ProductsHolder" in Ihrem ListView, aber es gibt keine PlaceHolder mit der angegebenen ID in Ihrem LayoutTemplate.

Fügen Sie einfach diesen Code auf Ihre LayoutTemplate

<LayoutTemplate> 
     <asp:PlaceHolder ID="ProductsHolder" runat="server"></asp:PlaceHolder> 
    </LayoutTemplate> 

Answer 2

Der Fehler, Sie werden immer bedeutet hat, dass Sie ein Steuerelement in Ihrem Layouttemplate denen erklären sollte, um zu bestimmen, wo die Elemente (ItemTemplate, EditItemTemplate usw.) instanziiert werden soll.

In diesem Live demo finden Sie ein Beispiel für das programmgesteuerte Erstellen von RadListView.