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

RadRating inside aspListView

14 Answers 184 Views

Rating

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

14 Answers, 1 is accepted

Accepted

answered on 30 Jul 2010, 03:56 PM

radratinginlistview.zip

Hi Jure,
I created a simple test page in order to try to reproduce the problem you have - please find it attached. The attached page works as expected, however, in case I remove the following condition, I am able to reproduce the problem you have:

private void Page_Load(object sender, EventArgs e)

{

if (!Page.IsPostBack)

{

lstTweets.DataSource = new int[] { 1, 2, 3 };

lstTweets.DataBind();

}

This, however, is expected - you will reproduce the same result with a standard ASP DropDownList control:

<asp:ListView ID="lstTweets" runat="server" ItemPlaceholderID="ListViewContainer"

OnItemDataBound="LstTweets_ItemDataBound" OnPagePropertiesChanged="LstTweets_PagePropertiesChanged">

<ItemTemplate>

<fieldset>

<telerik:RadRating ID="rtgRank" runat="server" AutoPostBack="true" OnRate="rtgRank_Rate" />

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true">

<asp:ListItem Text="1"></asp:ListItem>

<asp:ListItem Text="2"></asp:ListItem>

<asp:ListItem Text="3"></asp:ListItem>

</asp:DropDownList>

</fieldset>

</ItemTemplate>

</asp:ListView>

Basically, the problem comes from the fact that you recreate the child controls of the ListView control (by calling the DataBind method) after the LoadViewState stage. You can read more about the page lifecycle in MSDN. In case you want the controls in the ListView to load their ViewState correctly in this case, you can move the call to the DataBind method to the init stage:

protected override void OnInit(EventArgs e)

{

base.OnInit(e);

lstTweets.DataSource = new int[] { 1, 2, 3 };

lstTweets.DataBind();

}

You can refer to the following articles for additional information:
http://msdn.microsoft.com/en-us/library/hbdfdyh7.aspx
http://www.4guysfromrolla.com/articles/092904-1.aspx

Regards,
Tsvetie
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

answered on 03 Aug 2010, 01:33 PM

Hey!

It's me again :( I have another problem with RadRating.
I have a listview with multiple items, each item has a literal and a RadRanking control. In literal the average ranking is written.
The problem is that when I change the rank of an item I have to change it also in listViews datasource then I have to call lstTweets.DataBind() to see the changes on screen. But if I call the DataBind inside the Rate procedure the procedure will fire again. Why is that? I don't want it to start twice since it messes my averages. I tried using the OnClientRated method, but RadRating completely stops working if I put it in.
I posted some code below.

Thanks for your asistance.

Sincerely, Jure

<telerik:RadRating ID="rtgRank" runat="server" AutoPostBack="true" OnRate="RtgRank_Rate"

TweetID='<%#Eval("Tweet_ID")%>' Value='<%#Eval("Rank")%>'>

protected void RtgRank_Rate(object sender, EventArgs e)

{

RadRating r = (sender as RadRating);

string id = r.Attributes["TweetID"];

List<Tweet> tweetList = (List<Tweet>)lstTweets.DataSource;

Tweet t = tweetList.Find(a => a.Tweet_ID == id);

// calculate average

decimal rank = (t.Rank * t.VoteCount) + r.Value;

t.VoteCount++;

rank = rank / t.VoteCount;

t.Rank = rank;

lstTweets.DataBind();

}

answered on 27 Jul 2011, 05:26 PM

Hi,

I am trying to use Radrating control in Radlistview.
Once a item is rated I need to save data related to the item, through pagemethods using OnClientRated event.

function saverating(sender, args) {

var personId = document.getElementById("<%= hdnPersonId.ClientID %>");

var rating = sender.get_value();

function ratingsuccess(response) {

SucessMessage("Item rated successfully");

}

function ratingfail(response) {

failMessage('Operation Failed);

}

CallPageMethod('SaveRating', ratingsuccess, ratingfail, 'itemId',XXXX , 'rating',rating, 'personId', personId.value);

//I need to get the ItemId from the listview item which is unique for each row

}

</script>

<telerik:RadListView ID="rdItemListView" runat="server" PageSize="5" AllowPaging="True" ItemPlaceholderID="itemPlaceholder"

DataKeyNames = "ItemId" AllowCustomPaging="true" OnPageIndexChanged="rdItemListView_PageIndexChanged" >

<LayoutTemplate>

<div class="RadListView RadListView_<%#Container.Skin %>">

<table cellspacing="0" style="width: 100%;">

<thead>

<tr class="rlvHeader">

</tr>

</thead>

<tbody>

<tr id="itemPlaceholder" runat="server">

</tr>

<tr><td>

</td>

<td colspan="2">

<telerik:RadDataPager ID="rdPager" PageSize="5" PagedControlID="rdItemListView" runat="server"

Style="padding: 0 50px 0 20px">

<Fields>

<telerik:RadDataPagerButtonField FieldType="FirstPrev" />

<telerik:RadDataPagerButtonField FieldType="Numeric" />

<telerik:RadDataPagerButtonField FieldType="NextLast" />

<telerik:RadDataPagerPageSizeField PageSizeText="Page size: " />

<telerik:RadDataPagerGoToPageField CurrentPageText="Page: " TotalPageText="of" SubmitButtonText="Go"

TextBoxWidth="15" />

<telerik:RadDataPagerTemplatePageField>

<PagerTemplate>

<div style="float: right">

<b>Items

<asp:Label runat="server" ID="CurrentPageLabel" Text="<%# Container.Owner.StartRowIndex+1%>" />

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 %>" />

of

<asp:Label runat="server" ID="TotalItemsLabel" Text="<%# Container.Owner.TotalRowCount%>" />

<br />

</b>

</div>

</PagerTemplate>

</telerik:RadDataPagerTemplatePageField>

</Fields>

</telerik:RadDataPager>

</td>

<td colspan="3">

</td>

</tr>

</tbody>

</table>

</div>

</LayoutTemplate>

<ItemTemplate>

<tr class="rlvI">

<td>

<telerik:RadRating ID="rdItemRating"

CutsomAttribute='<%#Eval("ItemId")%>' OnClientRated="saverating" runat="server">

</telerik:RadRating>

</td>

</tr>

</ItemTemplate>

<EmptyDataTemplate>

<div class="RadListView RadListView_Sunset">

<div class="rlvEmpty">

There are no items to be displayed.</div>

</div>

</EmptyDataTemplate>

<SelectedItemTemplate>

<tr class="rlvISel">

</tr>

</SelectedItemTemplate>

</telerik:RadListView>

Problem :

How do I access the customAttribute property in the javascript, or is there way to identify the unique itemID on the client.
Any help on this is highly appreciated.

Thank You
Suresh