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Dynamically change the items in a radrating control

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John
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John asked on 09 Oct 2013, 08:16 PM
I have a radrating control in a radgrid to evaluate a series of questions.  In that series of questions are Yes/No questions and those that have at least 3 options for evaluation values.  My question: Is there a way to change the set of evaluation items in the radrating control based on whether the question is a Yes/No question or the other type?  I have a column in the radgrid that indicates the question type.  I also added two separate items in the radrating control with different numbers of rating items.  One set to Yes/No and the other with the other set of selections.  Is there a way to make change the visible property of one of these items to false when the radgrid is populated based on the question type?

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Slav
Telerik team
answered on 14 Oct 2013, 02:32 PM
Hello John,

You can use the server-side API of the RadRating control in order to modify its items. Please check the following example:
<telerik:RadRating ID="radRating1" runat="server">
    <Items>
        <telerik:RadRatingItem Value="1" ToolTip="Low"></telerik:RadRatingItem>
        <telerik:RadRatingItem Value="2" ToolTip="Medium"></telerik:RadRatingItem>
        <telerik:RadRatingItem Value="3" ToolTip="High"></telerik:RadRatingItem>
    </Items>
</telerik:RadRating>

On the code-behind the Items collection can be accessed and items could be added, removed or modified as shown below:
public void Page_Load(object sender, System.EventArgs e)
{
    radRating1.Items.RemoveAt(2);
    radRating1.Items[0].ToolTip = "Yes";
    radRating1.Items[1].ToolTip = "No";
}

Regards,
Slav
Telerik
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John
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answered on 15 Oct 2013, 02:05 PM
Slav,
Thanks for the reply.  I need to change the radrating based on a column in the radgrid.  I've tried on databind but that doesn't seem to work.  What radgrid event do I need to use to be able to read the column and change the radrating control for that row?

Thanks,

John
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John
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answered on 15 Oct 2013, 03:22 PM
Dim item As GridDataItem
        For Each item In Me.rgInputQuestions.Items
            If item("RatingScaleGroup").Text = "1" Then
                Me.rgInputQuestions.Controls("RatingValue").Visible = True
                Me.rgInputQuestions.Controls("Yes_NoRating").Visible = False
            Else
                Me.rgInputQuestions.Controls("RatingValue").Visible = False
                Me.rgInputQuestions.Controls("Yes_NoRating").Visible = True
            End If
        Next
I put the above code in the DataBinding event of the radgrid.  I get an error stating "Conversion from string "RatingValue" to type 'Integer' is not valid."  What am I missing?
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John
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answered on 15 Oct 2013, 03:29 PM
Dim item As GridDataItem
        Dim RatingValue As RadRating = Me.rgInputQuestions.FindControl("RatingValue")
        Dim Yes_NoRating As RadRating = Me.rgInputQuestions.FindControl("Yes_NoRating")
        For Each item In Me.rgInputQuestions.Items
            If item("RatingScaleGroup").Text = "1" Then
                RatingValue.Visible = True
                Yes_NoRating.Visible = False
            Else
                RatingValue.Visible = False
                Yes_NoRating.Visible = True
            End If
        Next
I also tried the above and received and error stating "Object reference not set to an instance of an object." on the RatingValue.Visible = true line.

<telerik:GridTemplateColumn HeaderText="Rate Question" UniqueName="RatingScaleID"  Readonly="true" HeaderStyle-Width="1%" ItemStyle-Width="1%">
                            <ItemTemplate>
                                    <telerik:RadRating
                                        ID="RatingValue"
                                        runat="server"
                                        AutoPostBack="true"
                                        DataMember="RatingScaleID"
                                        ViewStateMode="Enabled"
                                        SelectionMode="Single"
                                        ItemCount="3"
                                        Value='<%# Eval("RatingScaleID")%>'
                                        OnRate="RateValue_Rate"
                                        Precision="Item"
                                        ItemHeight = "32px"
                                        ItemWidth = "32px"
                                        >
                                        <Items>
                                           <telerik:RadRatingItem Value="4" HoveredImageUrl="../../Images/NR_red.png" HoveredSelectedImageUrl="../../Images/NR_red.png"
                                                SelectedImageUrl="../../Images/NR_red.png" ImageUrl="../../Images/NR_black.png"
                                                ToolTip="Not Rated"></telerik:RadRatingItem>
                                           <telerik:RadRatingItem Value="1" HoveredImageUrl="../../Images/Red_arrow_down_26x32.png" HoveredSelectedImageUrl="../../Images/black_arrow_down_26x32.png"
                                                SelectedImageUrl="../../Images/Red_arrow_down_26x32.png" ImageUrl="../../Images/Black_arrow_down_26x32.png"
                                                ToolTip="Doesn't Meet/No"></telerik:RadRatingItem>
                                           <telerik:RadRatingItem Value="2" HoveredImageUrl="../../Images/Gold_arrow_left-right_32x32.png" HoveredSelectedImageUrl="../../Images/Gold_arrow_left-right_32x32.png"
                                                SelectedImageUrl="../../Images/Gold_arrow_left-right_32x32.png" ImageUrl="../../Images/Black_arrow_side-to-side.png" ToolTip="Meets/Yes">
                                           </telerik:RadRatingItem>
                                           <telerik:RadRatingItem Value="3" HoveredImageUrl="../../Images/Green_arrow_up_26x32.png" HoveredSelectedImageUrl="../../Images/Green_arrow_up_26x32.png"
                                                SelectedImageUrl="../../Images/Green_arrow_up_26x32.png" ImageUrl="../../Images/Black_arrow_up_26x32.png" ToolTip="Exceeds">
                                           </telerik:RadRatingItem>
                                        </Items>
 
                                </telerik:RadRating>
                                <telerik:RadRating
                                        ID="Yes_NoRating"
                                        runat="server"
                                        AutoPostBack="true"
                                        DataMember="RatingScaleID"
                                        ViewStateMode="Enabled"
                                        SelectionMode="Single"
                                        ItemCount="3"
                                        Value='<%# Eval("RatingScaleID")%>'
                                        OnRate="RateValue_Rate"
                                        Precision="Item"
                                        ItemHeight = "32px"
                                        ItemWidth = "32px"
                                        Visible = "false">
                                        <Items>
                                           <telerik:RadRatingItem Value="4" HoveredImageUrl="../../Images/NR_red.png" HoveredSelectedImageUrl="../../Images/NR_red.png"
                                                SelectedImageUrl="../../Images/NR_red.png" ImageUrl="../../Images/NR_black.png"
                                                ToolTip="Not Rated"></telerik:RadRatingItem>
                                           <telerik:RadRatingItem Value="1" HoveredImageUrl="../../Images/Red_arrow_down_26x32.png" HoveredSelectedImageUrl="../../Images/Red_arrow_down_26x32.png"
                                                SelectedImageUrl="../../Images/Red_arrow_down_26x32.png" ImageUrl="../../Images/Black_arrow_down_26x32.png"
                                                ToolTip="Doesn't Meet/No"></telerik:RadRatingItem>
                                           <telerik:RadRatingItem Value="3" HoveredImageUrl="../../Images/Green_arrow_up_26x32.png" HoveredSelectedImageUrl="../../Images/Green_arrow_up_26x32.png"
                                                SelectedImageUrl="../../Images/Green_arrow_up_26x32.png" ImageUrl="../../Images/Black_arrow_up_26x32.png" ToolTip="Exceeds">
                                           </telerik:RadRatingItem>
                                        </Items>
 
                                </telerik:RadRating>
                              </ItemTemplate>
                         </telerik:GridTemplateColumn>
This is the set up I have for the radrating controls.  Any help would be appreciated.
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Slav
Telerik team
answered on 18 Oct 2013, 08:45 AM
Hello John,

You can find attached a sample page that should help you implement the desired functionality. It uses the ItemDataBound event of RadGrid in order to access the RadRating controls in each item and configure the accordingly.

Please use the example as a reference for your further development.

Regards,
Slav
Telerik
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John
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answered on 29 Oct 2013, 04:10 PM
Thanks for the reply.  I get the following error.

Script control 'YesNoRating' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().
Parameter name: scriptControl


I did some searching earlier on this error when I tried to use the OnItemDataBound and found some posts indicating that it was only possible to hide a control during the pre-render event of the rad grid.  I had put the code in the pre-render event and after the initial page load it works fine.  It doesn't work on the initial page load though.  Only after an item is selected in the grid above that causes the rsInputQuestions grid to reload.  I have tried putting a rebind for the rsInputQuestions grid in various places in the code behind to no avail.  Any ideas?

Edit:  Here's the post I was talking about.  http://nwije.blogspot.com/2011/04/script-control-controlname-is-not.html
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John
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answered on 29 Oct 2013, 06:06 PM
Ok I fixed the issue.  I added code to register the controls which worked fine in when the control was in the pre-render event, but threw and error when in postback.  Adding a line of code to check for post back and bypassing the registration steps at that point cleared up the issue.

Thanks again for your help.
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