Can't retrieve value in UI for ASP.NET AJAX Slider

Voss Grose

81 posts

Member since:
Sep 2012

Posted 09 Jan 2009 Link to this post

I have the following RadSlider which is in a UserControl:
        <telerik:RadSlider runat="server" ID="rsVery" EnableViewState="false" Orientation="Horizontal" Width="500" Height="50" TrackPosition="TopLeft" Skin="Inox" ItemType="Item" MinimumValue="-10" MaximumValue="10" SmallChange="1" ShowDecreaseHandle="true" ShowIncreaseHandle="true" Visible="true" AnimationDuration="250">
            <Items>
                <telerik:RadSliderItem Text="Very Slow" Value="-3" ToolTip="Very Slow" runat="server"></telerik:RadSliderItem>
                <telerik:RadSliderItem Text="Slow" Value="-2" runat="server"></telerik:RadSliderItem>
                <telerik:RadSliderItem Text="Normal" Value="0" runat="server"></telerik:RadSliderItem>
                <telerik:RadSliderItem Text="Fast" Value="2" runat="server"></telerik:RadSliderItem>
                <telerik:RadSliderItem Text="Very Fast" Value="3" runat="server"></telerik:RadSliderItem>
            </Items>
        </telerik:RadSlider>

The .Value just returns the position index.

can you tell me what I'm doing wrong..

thanks

cbospikes

16 posts

Member since:
May 2007

Posted 10 Jan 2009 Link to this post

I used the following to find the value server side

Dim sli As RadSlider = TryCast(item.FindControl("rslider"), Telerik.Web.UI.RadSlider)
Dim value As Integer = sli.Value
Dim routsegid As String = sli.Items(value).Value.ToString()

use the slider value (index) to get the selected slideritem. Then get the value of the item.

Tsvetie

Admin

1517 posts

Posted 12 Jan 2009 Link to this post

Hi,
Yes, this is the correct way to obtain the value of the currently selected item of the RadSlider. By design, when you have items in the RadSlider, the slider itself can accept values from 0 to the number of the items minus 1. We made this on purpose, so that the developers have more flexibility and can define sliders like the following one:

    
            <telerik:RadSlider ID="MonthsSlider" runat="server" Orientation="Vertical" Skin="SkyBlue" 
        
                Height="417px" Width="100px" CssClass="monthsSlider" ItemType="Item" TrackPosition="TopLeft" 
        
                Value="5" OnClientValueChange="MonthChange"> 
        
                <Items> 
        
                    <telerik:RadSliderItem Text="January" Value="Jan" /> 
        
                    <telerik:RadSliderItem Text="February" Value="Feb" /> 
        
                    <telerik:RadSliderItem Text="March" Value="Mar" /> 
        
                    <telerik:RadSliderItem Text="April" Value="Apr" /> 
        
                    <telerik:RadSliderItem Text="May" Value="May" /> 
        
                    <telerik:RadSliderItem Text="June" Value="Jun" /> 
        
                    <telerik:RadSliderItem Text="July" Value="Jul" /> 
        
                    <telerik:RadSliderItem Text="August" Value="Aug" /> 
        
                    <telerik:RadSliderItem Text="September" Value="Sep" /> 
        
                    <telerik:RadSliderItem Text="October" Value="Oct" /> 
        
                    <telerik:RadSliderItem Text="November" Value="Nov" /> 
        
                    <telerik:RadSliderItem Text="December" Value="Dec" /> 
        
                </Items> 
        
            </telerik:RadSlider>

Greetings,
Tsvetie
the Telerik team

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Terry Brown

3 posts

Member since:
May 2006

Posted 26 Mar 2009 Link to this post

I understand your reasoning for doing this (it certainly does allow us to be more flexible) though I wonder at your omission of a

Slider.SelectedItem as a public property that acts as a wrapper for

slider.Items[slider.Value]

So rather than in code having to do:

sldSlider1.Items[sldSlider1.Value].Value

I can just do:

sldSlider1.SelectedItem.Value

it's elegance really, functionally it makes little difference, but aesthetically in code and logically I think it's better?

that said, if there is already something like this, please ignore the post - I just haven't managed to find it.

Cheers,
Terry

Tsvetie

Admin

1517 posts

Posted 30 Mar 2009 Link to this post

Hello Terry,
There is such a server property - SelectedItems, however, it is not implemented yet. We will do our best to implement it for the SP, scheduled for this week.

All the best,
Tsvetie
the Telerik team

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Tony Isaac

3 posts

Member since:
May 2009

Posted 20 May 2009 Link to this post

So how do you get the value client-side?

I want a label next to the slider to show the selected value as the user slides the slider. This takes to long if it has to be done server-side. I see in the generated HTML that the LI tags do not have any reference to the values, only the indexes. Is there a way around this?

Tsvetie

Admin

1517 posts

Posted 21 May 2009 Link to this post

Hello Tony Isaac,
You can get the value of a slider item on the client in a similar manner as on the server:

    
            function GetItemValue()   
        
            {   
        
                var slider = $find('<%= RadSlider1.ClientID %>');   
        
                var selectedItem = slider.get_items()[slider.get_value()];   
        
                alert(selectedItem.get_value());   
        
            }

All the best,
Tsvetie
the Telerik team

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Tony Isaac

3 posts

Member since:
May 2009

Posted 22 May 2009 Link to this post

Voss,

Thank you for your response. However, the code you suggested gets only the numeric index of the slider position, not the value of that index. In the code below, I want the text for each item, not the numeric index.

<telerik:RadSlider ID="RadSlider" runat="server" MaximumValue="7"
Width="300px" Height="22px" Length="300" ItemType="Tick" onclientslide="OnSlide" >
<Items>
<telerik:RadSliderItem runat="server" Text="Not Set" Value="Not Set" />
<telerik:RadSliderItem runat="server" Text="Very unhappy"  Value="Very unhappy" />
<telerik:RadSliderItem runat="server" Text="Unhappy" Value="Unhappy" />
<telerik:RadSliderItem runat="server" Text="Somewhat unhappy"  Value="Somewhat unhappy" />
<telerik:RadSliderItem runat="server" Text="Neutral" Value="Neutral" />
<telerik:RadSliderItem runat="server" Text="Somewhat satisfied"  Value="Somewhat satisfied" />
<telerik:RadSliderItem runat="server" Text="Satisfied" Value="Satisfied" />
<telerik:RadSliderItem runat="server" Text="Very satisfied" Value="Very satisfied" />
</Items>
</telerik:RadSlider>

Tony

Tsvetie

Admin

1517 posts

Posted 22 May 2009 Link to this post

Hi Tony Isaac,
In case you need to text of a slider item, you should use the get_text method:

    
            function GetItemValue()    
        
            {    
        
                var slider = $find('<%= RadSlider1.ClientID %>');    
        
                var selectedItem = slider.get_items()[slider.get_value()];    
        
                alert(selectedItem.get_text());    
        
            }

Regards,
Tsvetie
the Telerik team

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Tony Isaac

3 posts

Member since:
May 2009

Posted 22 May 2009 Link to this post

Thank you again for your quick response. However, we still don't have a solution. The get_text() method still only returns the index number:

    
                        function OnSlide()  
        
                        {  
        
                            var slider = $find('<%= RadSlider.ClientID %>');  
        
                            var selectedItem = slider.get_items()[slider.get_value()];  
        
                            document.getElementById('GoodFeeling').innerText = selectedItem.get_text();  
        
                        }

Tony

Tsvetie

Admin

1517 posts

Posted 25 May 2009 Link to this post

Hi Tony Isaac,
I am not quite sure what you mean by index number. When I run the provided code for the following RadSlider, I get January, February, March, etc:

    
            <script type="text/javascript"> 
        
                function OnSlide(sender, args)   
        
                {   
        
                    var slider = sender;   
        
                    var selectedItem = slider.get_items()[slider.get_value()];   
        
                    document.getElementById('GoodFeeling').innerText = selectedItem.get_text();   
        
                }  
        
            </script> 
        
            <div id="GoodFeeling"> 
        
            </div> 
        
            <telerik:RadSlider ID="RadSlider1" runat="server" ItemType="Item" Width="700px" Height="70px" 
        
                TrackPosition="BottomRight" OnClientSlide="OnSlide"> 
        
                <Items> 
        
                    <telerik:RadSliderItem Text="January" Value="Jan" /> 
        
                    <telerik:RadSliderItem Text="February" Value="Feb" /> 
        
                    <telerik:RadSliderItem Text="March" Value="Mar" /> 
        
                    <telerik:RadSliderItem Text="April" Value="Apr" /> 
        
                    <telerik:RadSliderItem Text="May" Value="May" /> 
        
                    <telerik:RadSliderItem Text="June" Value="Jun" /> 
        
                    <telerik:RadSliderItem Text="July" Value="Jul" /> 
        
                    <telerik:RadSliderItem Text="August" Value="Aug" /> 
        
                    <telerik:RadSliderItem Text="September" Value="Sep" /> 
        
                    <telerik:RadSliderItem Text="October" Value="Oct" /> 
        
                    <telerik:RadSliderItem Text="November" Value="Nov" /> 
        
                    <telerik:RadSliderItem Text="December" Value="Dec" /> 
        
                </Items> 
        
            </telerik:RadSlider>

As I am not sure which version of the assembly you use, I tested with the latest - 2009.1.402.

In case this does not help you, please prepare and send me a simple running project, demonstrating the problem as well as detailed information on the expected result.

Best wishes,
Tsvetie
the Telerik team

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Josh

16 posts

Member since:
Nov 2013

Posted 03 Nov 2016 in reply to Tsvetie Link to this post

slider.get_items is undefined. Has something changed? How can I get the current text of the item at the specified index?

I've isolated this demo,

http://demos.telerik.com/aspnet-ajax/slider/examples/clientsideevents/defaultvb.aspx?show-source=true

I changed javascript code as follows: It does not work.

rangeSliderValueChanging: function (sender, args) {
var newValue = args.get_newValue();
var isFirstHandleActive = getActiveDragHandle(sender);

var slider = sender;
var selectedItem = slider.get_items()[slider.get_value()];
alert(selectedItem.get_text());

},

Josh

16 posts

Member since:
Nov 2013

Posted 03 Nov 2016 in reply to Josh Link to this post

To be clear, the current selected index is returned just fine. Its the get_items() that does not work. Returns an empty array.

Josh

16 posts

Member since:
Nov 2013

Posted 03 Nov 2016 in reply to Josh Link to this post

To be clear, I can get the index ok. Its the get_items() that returns an empty array.

Josh

16 posts

Member since:
Nov 2013

Posted 03 Nov 2016 Link to this post

I found the problem. You must explicitly assign the ItemType property to "Item" for it to work. Even though its the default as far as I can tell. Issue resolved. Thanks.