Slider range color in RadGrid

[Ken]

See attached image.. this was created in a RadGrid in a GridTemplateColumn.  what I would like to do is make each grid range color different. All values come from a database even the color, Would this be done somehow in itemcreate or itemdatabound.

Thanks

[Konstantin Dikov]

Hello Ken,

You have correctly guessed that the server-side ItemDataBound event could be used for such requirement. In the ItemDataBound event handler you could get reference to the template column, then to the RadSlider control and finally, apply the customization:

<telerik:RadGrid ID="RadGrid1" OnNeedDataSource="RadGrid1_NeedDataSource" runat="server" OnItemDataBound="RadGrid1_ItemDataBound">
    <MasterTableView AutoGenerateColumns="false">
        <Columns>
            <telerik:GridTemplateColumn UniqueName="Slider">
                <ItemTemplate>
                    <telerik:RadSlider ID="RadSlider1" runat="server" EnableDragRange="true" IsSelectionRangeEnabled="true"
                        MinimumValue="0" MaximumValue="30" SmallChange="5" LargeChange="10"
                        .....
                        .....

And the code-behind:

protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    DataTable table = new DataTable();
    table.Columns.Add("ID", typeof(int));
    table.Columns.Add("RangeStart", typeof(int));
    table.Columns.Add("RangeEnd", typeof(int));
    table.Columns.Add("Color", typeof(string));

    table.Rows.Add(1, 5, 10, "#363636");
    table.Rows.Add(2, 15, 20, "#cc3636");
    table.Rows.Add(3, 20, 30, "#ff3636");

    (sender as RadGrid).DataSource = table;
}

protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
{
    if (e.Item is GridDataItem)
    {
        GridDataItem item = e.Item as GridDataItem;
        RadSlider slider = item["Slider"].FindControl("RadSlider1") as RadSlider;
        slider.BackColor = System.Drawing.ColorTranslator.FromHtml((item.DataItem as DataRowView).Row["Color"].ToString());
    }
}

Another approach is to handle this entirely in the markup:

<telerik:GridTemplateColumn UniqueName="Slider">
    <ItemTemplate>
        <telerik:RadSlider ID="RadSlider1" runat="server" EnableDragRange="true" IsSelectionRangeEnabled="true"
            MinimumValue="0" MaximumValue="30" SmallChange="5" LargeChange="10"
             SelectionStart='<%# decimal.Parse(DataBinder.Eval((Container as GridDataItem).DataItem, "RangeStart").ToString()) %>'
             SelectionEnd='<%# decimal.Parse(DataBinder.Eval((Container as GridDataItem).DataItem, "RangeEnd").ToString()) %>'
             BackColor= '<%# System.Drawing.ColorTranslator.FromHtml(DataBinder.Eval((Container as GridDataItem).DataItem, "Color").ToString()) %>'
            >
        </telerik:RadSlider>
    </ItemTemplate>
</telerik:GridTemplateColumn>

Hope that helps.


Regards,
Konstantin Dikov
Telerik

 

 

[Ken]

That works well when changing the background color.. Any chance on just changing the range color (see attached image)

Thanks

[Konstantin Dikov]

Hello Ken,

It is not possible to directly change the color of the selected part of the slider. You should have in mind that actually an image is used for that part.

Nevertheless, for your scenario I could suggest that you add the color to the ClientDataKeyNames collection and use the following code to get reference to that element in the slider and set the background color:

<telerik:RadGrid ID="RadGrid1" OnNeedDataSource="RadGrid1_NeedDataSource" runat="server">
    <MasterTableView AutoGenerateColumns="false" ClientDataKeyNames="Color">
       .......

And the JavaScript:

<telerik:RadCodeBlock runat="server">
    <script type="text/javascript">
        function pageLoad(sender, args) {
            var grid = $find("RadGrid1");
            var dataItems = grid.get_masterTableView().get_dataItems();

            for (var i = 0; i < dataItems.length; i++) {
                var slider = $telerik.findControl(dataItems[i].get_element(), "RadSlider1");
                var selectionElement = document.getElementById("RadSliderSelected_" + slider.get_id());
                selectionElement.style.backgroundImage = "none";
                selectionElement.style.backgroundColor = dataItems[i].getDataKeyValue("Color");
            }
        }
    </script>
</telerik:RadCodeBlock>

Hope that helps.


Regards,
Konstantin Dikov
Telerik

 

 

[Ken]

Seems that might work... My scenario the RadSlider is in a detail table  GridTableView not  directly in the master table.

Thanks

[Ken]

Thanks for the help it pointed me in the correct direction. The following is the code. for detail tables
.
​

function pageLoad(sender, args) {
    var grid = $find("<%=RadGrid1.ClientID %>");
    if (grid) {
        var MasterTable = grid.get_masterTableView();
        var Rows = MasterTable.get_dataItems();
        for (var i = 0; i < Rows.length; i++) {
            var row = Rows[i];
            row.set_selected(true);
            var childTable = row.get_nestedViews();
            if (childTable) {
                if (childTable.length > 0) {
                    var childItems = childTable[0].get_dataItems();
                    for (var i = 0; i < childItems.length; i++) {
                        var slider = $telerik.findControl(childItems[i].get_element(), "ComponentSlider");
                        var selectionElement = document.getElementById("RadSliderSelected_" + slider.get_id());
                        selectionElement.style.backgroundImage = "none";
                        selectionElement.style.backgroundColor = childItems[i].getDataKeyValue("DisplayColor");
                    }
                }
            }
        }
    }
}

[Ken]

I am making a new page and the grid is now in a RadPageView.

The document.getElementById("RadSliderSelected_" + slider.get_id()) returns a null

It finds the Slider control ok and the slider.get_id() is good but the get elementById returns null.

It works fine on same page when not in a RadPageView

Thanks

[Konstantin Dikov]

Hi Ken,

You can try to modify the JavaScript with the following and use $telerik.findElement(container, id) instead:

function pageLoad(sender, args) {
    var grid = $find("RadGrid1");
    var dataItems = grid.get_masterTableView().get_dataItems();

    for (var i = 0; i < dataItems.length; i++) {
        var slider = $telerik.findControl(dataItems[i].get_element(), "RadSlider1");
        var selectionElement = $telerik.findElement(dataItems[i].get_element(), "RadSliderSelected_" + slider.get_id());
        selectionElement.style.backgroundImage = "none";
        selectionElement.style.backgroundColor = dataItems[i].getDataKeyValue("Color");
    }
}

Please give this a try and see if it will resolve the issue on your side too.


Regards,
Konstantin Dikov
Telerik

[Ken]

No luck ... selectionElement  still a null: 

var selectionElement = $telerik.findElement(dataItems[i].get_element(), "RadSliderSelected_" + slider.get_id());

[Konstantin Dikov]

Hello Ken,

After further testing I have noticed that when the RadPageView holding the RadGrid is not initially selected, the previous code will fail, because the RadSlider element will not be initialized at this point. If you set the Selected property of that RadPageView to true, everything should work correctly.

Now, since setting the Selected property might not be possible in your case, you could handle the client-side OnClientTabSelected event of the RadTabStrip and when the tab holding the grid is opened, execute the code from the previous post:

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
    <script type="text/javascript">
        function pageLoad(sender, args) {

        }

        function tabSelected(sender, args) {
            if (args.get_tab().get_id() == 0) { //change this with the corresponding TAB index, where the grid is located
                var grid = $find("RadGrid1");
                var dataItems = grid.get_masterTableView().get_dataItems();
                for (var i = 0; i < dataItems.length; i++) {
                    var slider = $telerik.findControl(dataItems[i].get_element(), "RadSlider1");
                    var selectionElement = $telerik.findElement(dataItems[i].get_element(), "RadSliderSelected_" + slider.get_id());
                    selectionElement.style.backgroundImage = "none";
                    selectionElement.style.backgroundColor = dataItems[i].getDataKeyValue("Color");
                }
            }
        }
    </script>
</telerik:RadCodeBlock>

<telerik:RadTabStrip runat="server" ID="RadTabStrip1" MultiPageID="RadMultiPage1" OnClientTabSelected="tabSelected">
    <Tabs>
        <telerik:RadTab PageViewID="Page1"></telerik:RadTab>
    </Tabs>
</telerik:RadTabStrip>

<telerik:RadMultiPage runat="server" ID="RadMultiPage1">
    <telerik:RadPageView runat="server" Width="100%" ID="Page1">
        <telerik:RadGrid runat="server" ID="RadGrid1" OnNeedDataSource="RadGrid1_NeedDataSource">
            <MasterTableView ClientDataKeyNames="Color">
                <Columns>
                    <telerik:GridTemplateColumn>
                        <ItemTemplate>
                            <telerik:RadSlider runat="server" ID="RadSlider1" EnableDragRange="true" IsSelectionRangeEnabled="true"
                                MinimumValue="0" MaximumValue="30" SmallChange="5" LargeChange="10">
                            </telerik:RadSlider>
                        </ItemTemplate>
                    </telerik:GridTemplateColumn>
                </Columns>
            </MasterTableView>
        </telerik:RadGrid>
    </telerik:RadPageView>
</telerik:RadMultiPage>

Regards,
Konstantin Dikov
Telerik