Is this a bug?

[Eric Wallace]

If you take the following code:

<telerik:Radslider id="slider2" runat="server" itemtype="Item" skin="Windows7" Height="40px">

  <Items>

    <telerik:RadSliderItem Value="1" Text="One" />

    <telerik:RadSliderItem Value="2" Text="Two" />

    <telerik:RadSliderItem Value="3" Text="Three" />

  </Items>

</telerik:Radslider>

<script type="text/javascript">

$(document).ready(function()

{

  $find('<%= slider2.ClientID %>').set_value(2);

});

</script>


and run it in a browser, it actually sets the slider to Item 3, not 2 as specified. Is this a known issue or am I missing something here?

[Eric Wallace]

I think there may be an indexer out of place. If I do:
  $find('<%= slider2.ClientID %>').set_value(0) - it selects the first option
  $find('<%= slider2.ClientID %>').set_value(1) - it selects the second option
  $find('<%= slider2.ClientID %>').set_value(2) - it selects the third option

Problem is, I have to go off of the value, not the zero-based index.

[Tsvetie]

Hello Eric Wallace,
The behavior you describe is expected. Basically, in the case of an items slider, the Value property of the slider specifies (gets and sets) the selected item index. Currently, RadSlider only provides methods to get the selectedItem(s)/selectedValue of the currently selected item. In order to implement the functionality you describe, you can use the client-side API of RadSlider to find the item by value and then set it as selected item. For example:

var slider = $find('<%= slider2.ClientID %>')

var itemValue = 2;
var items = slider.get_items();

var index = items.length;
while(--index && (items[index].get_value() != itemValue)){}

if(index)
    slider.set_value(index);

Greetings,
Tsvetie
the Telerik team

[Eric Wallace]

Thanks for your help, Tsvetie. I'm curious as to why the documentation for the slider control does not state that set_value actually sets the selected index. That is extremely confusing terminology.If an item's value is 1, and I call set_value(1), I would expect the item with the value of 1 to be selected. Maybe a set_selectedIndex(idx) function would be more appropriate for future versions?

Thanks,
Eric

[Eric Wallace]

It should also be noted that get_value() returns the selected index as well, not the value of the selected item as one would expect.

[Tsvetie]

Hello Eric Wallace,
RadSlider has three modes - numeric slider, items slider and ticks slider. In all three modes, the Value property stands for the value of the slider control itself. In case you have noticed, the Value of a slider item is of type String, whereas the Value property of the slider control is of type Decimal. That is why, it is simply not possible for the Value property of the slider control to return the value of the selected item. You are correct that it as an omission for our part, that we have not explained this in the documentation. I will log it in our ToDo list.

Regarding getting the value of the selected item, you can use the get_selectedValue method.

Kind regards,
Tsvetie
the Telerik team