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RadListView DataBind problems

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ListView

This is a migrated thread and some comments may be shown as answers.

Jure asked on 11 Apr 2011, 02:03 PM

Hey!

The list displays message text and has 2 buttons "+" and "-", so users vote if they like or dislike the message.

I tried 2 solutions but have problems with both.

1st solution is without needdatasource:

Here is the ListView:

<telerik:RadListView ID="rlvTweets" runat="server" Width="100%" DataKeyNames="Tweet_ID"

AllowPaging="True" PageSize="5" ItemPlaceholderID="ObjectHolder"

OnItemCommand="rlvTweets_ItemCommand"

OnItemDataBound="rlvTweets_ItemDataBound" >

<LayoutTemplate>

<asp:Panel ID="ObjectHolder" runat="server" />

<telerik:RadDataPager ID="rdpTweets" runat="server" PagedControlID="rlvTweets" PageSize="5" Visible='<%# rlvTweets.PageCount != 1%>' >

<Fields>

<telerik:RadDataPagerButtonField FieldType="Numeric" />

</Fields>

</telerik:RadDataPager>

</LayoutTemplate>

<ItemSeparatorTemplate>

<div class="separator"></div>

</ItemSeparatorTemplate>

<ItemTemplate>

<%--Image Avatar--%>

<asp:HyperLink ID="hlAvatar" runat="server" ImageUrl='<%#Eval("trTwitterUser.Avatar")%>' />

<%--Link Username--%>

<asp:HyperLink ID="hlUsername" runat="server" Text='<%#Eval("trTwitterUser.Username")%>' />

<%--Buttons follow/stop following--%>

<asp:Button ID="btnFollow" runat="server" Text="<%$ Resources:Localization, Follow %>" ToolTip="<%$ Resources:Localization, Follow %>" CommandName="Follow" />

<asp:Button ID="btnStopFollowing" runat="server"

Text="<%$ Resources:Localization, StopFollowing  %>" ToolTip="<%$ Resources:Localization, StopFollowing  %>" CommandName="StopFollowing" />

<br />

<%--Text message--%>

<%#Eval("Text")%>

<br />

<%--Rank and plus/minus buttons--%>

<asp:Label ID="lblRank" runat="server" Text='<%#Eval("Rank")%>' />

<asp:Button ID="btnPlus" runat="server" Text="+" CommandName="PlusVote" />

<asp:Button ID="btnMinus" runat="server" Text="-" CommandName="MinusVote" />

<br />

<%--TweetRank--%>

<asp:Label ID="lblTweetRank" runat="server" Text='<%#Eval("TweetRank")%>' />

<br />

<%--Klout icon and KloutScore--%>

<asp:Image ID="imgKlout" imageUrl="~/Resources/Images/KloutScore.png" runat="server" />

<%#Eval("trTwitterUser.KloutScore")%>

<br />

<%--Date--%>

<%#Eval("Date")%>

</ItemTemplate>

<EmptyDataTemplate>

<asp:Label ID="lblNoTweets" runat="server" Text="<%$ Resources:Localization, NoTweetsFound %>" />

</EmptyDataTemplate>

</telerik:RadListView>

I databind the list in page_load;

rlvTweets.DataSource = _db.trTweets.Where(tw => tw.Date > dt).OrderByDescending(t => t.Date);

rlvTweets.DataBind();

Everything works fine on the first page, the itemcommand fires, tweet is set properly... However if I use the pager the ItemCommand doesn't even fire.

protected void rlvTweets_ItemCommand(object sender, RadListViewCommandEventArgs e)

{

RadListViewDataItem item = (RadListViewDataItem)e.ListViewItem;

trTweet tweet = (trTweet)item.DataItem;

        if (e.CommandName == "PlusVote")

        {

             ....

        }

}

The second solution is with using the needdatasource:

ListIs the same except for needdatasource event, itemcommand is the same, the itemcommand fires everywhere now except that the item.DataItem is always null...

I removed the databinding from the page load and added it to the needdata source. I feel like I have to call the list's DataBind function somewhere, but I don't know here...

this is what i do in needdatasource:

protected void rlvTweets_NeedDataSource(object sender, RadListViewNeedDataSourceEventArgs e)

{

DateTime dt = DateTime.Now.AddDays(-30);

rlvTweets.DataSource = _db.trTweets.Where(tw => tw.Date > dt).OrderByDescending(t => t.Date);

}

Thanks for you help!

Sincerely, Jure

RadListView DataBind problems

2 Answers, 1 is accepted