Getting Started with the ColorPalette

This tutorial explains how to set up a basic Telerik UI for ASP.NET Core ColorPalette and highlights the major steps in the configuration of the component.

You will initialize a ColorPalette control with a custom set of colors. Next, you will handle the Change event of the component to get the selected color and apply it as a background color to DropDownButtons. Finally, you can run the sample code in Telerik REPL and continue exploring the components.

Sample Telerik UI for ASP.NET Core ColorPalette

Prerequisites

To successfully complete the tutorial, you need a project that is already configured to use the Telerik UI for ASP.NET Core components:

To create a new pre-configured project for the Telerik UI for ASP.NET Core components, you can use a project template.
To manually configure an existing project, follow the First Steps on Windows or First Steps on Mac articles.

1. Prepare the CSHTML File

The first step is to add the required directives at the top of the .cshtml document:

To use the Telerik UI for ASP.NET Core HtmlHelpers:
```
@using Kendo.Mvc.UI
```
To use the Telerik UI for ASP.NET Core TagHelpers:
```
@addTagHelper *, Kendo.Mvc
```

Optionally, you can structure the View content by adding the desired HTML elements like headings, divs, paragraphs, and others.

    @using Kendo.Mvc.UI

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
        </div>
    </div>

    @addTagHelper *, Kendo.Mvc

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
        </div>
    </div>

2. Initialize the ColorPalette

Use the ColorPalette HtmlHelper or TagHelper to add the component to a page:

The Name() configuration method is mandatory as its value is used for the id and the name attributes of the ColorPalette element.
The Palette() option sets the desired range of colors that the user can pick from.

    @using Kendo.Mvc.UI

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
            @(Html.Kendo().ColorPalette()
                .Name("colorpalette")
                .Palette(new string[] {
                    "#f2f2f2", "#7f7f7f", "#a7d6ff", "#d9dde4", "#e5f5d7", "#fad0e4", "#fef0cd", "#c5f2ff", "#e2e7f4", "#c9f7f1"
                })
            )
        </div>
    </div>

    @addTagHelper *, Kendo.Mvc
    @{
        var color_set = new string[] { "#f2f2f2", "#7f7f7f", "#a7d6ff", "#d9dde4", "#e5f5d7", "#fad0e4", "#fef0cd", "#c5f2ff", "#e2e7f4", "#c9f7f1" };
    }

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
            <kendo-colorpalette name="colorpalette"
                palette-colors="color_set">
            </kendo-colorpalette>
        </div>
    </div>

3. Implement the Color Changing

The next step is to configure DropDownButtons and handle the ColorPalette color selection. The Change event handler allows you to access the selected color. Iterate through the DropDownButtons on the page and change the background color of each button by using the jQuery css() method.

    @using Kendo.Mvc.UI

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
            @(Html.Kendo().ColorPalette()
            .Name("colorpalette")
            .Palette(new string[] {
                "#f2f2f2", "#7f7f7f", "#a7d6ff", "#d9dde4", "#e5f5d7", "#fad0e4", "#fef0cd", "#c5f2ff", "#e2e7f4", "#c9f7f1"
            })
            .Events(ev=>ev.Change("onChange")))
        </div>
        <div class="buttons-container">
            <div class='column'>
                <h4>Default Button:</h4>
                @(Html.Kendo().DropDownButton()
                    .Name("default")
                    .Text("Paste")
                    .Icon("clipboard")
                    .Items(items=>{
                        items.Add().Id("keep-text").Text("Keep Text Only").Icon("clipboard-text").Click(@<text>function() { alert("Keep Text Only") }</text>);
                        items.Add().Id("paste-html").Text("Paste as HTML").Icon("clipboard-code").Click(@<text>function() { alert("Paste as HTML") }</text>);
                        items.Add().Id("paste-markdown").Text("Paste Markdown").Icon("clipboard-markdown").Click(@<text>function() { alert("Paste Markdown") }</text>);
                        items.Add().Id("paste-default").Text("Set Default Paste").Click(@<text>function() { alert("Set Default Paste") }</text>);
                    })
                )
            </div>
            <div class='column'>
                <h4>Outline Button:</h4>
                @(Html.Kendo().DropDownButton()
                    .Name("outline")
                    .Text("Paste")
                    .FillMode(FillMode.Outline)
                    .Icon("clipboard")
                    .Items(items=>{
                        items.Add().Id("keep-text").Text("Keep Text Only").Icon("clipboard-text").Click(@<text>function() { alert("Keep Text Only") }</text>);
                        items.Add().Id("paste-html").Text("Paste as HTML").Icon("clipboard-code").Click(@<text>function() { alert("Paste as HTML") }</text>);
                        items.Add().Id("paste-markdown").Text("Paste Markdown").Icon("clipboard-markdown").Click(@<text>function() { alert("Paste Markdown") }</text>);
                        items.Add().Id("paste-default").Text("Set Default Paste").Click(@<text>function() { alert("Set Default Paste") }</text>);
                    })
                )
            </div>
            <div class='column'>
                <h4>Primary Button:</h4>
                @(Html.Kendo().DropDownButton()
                    .Name("primary")
                    .Text("Paste")
                    .ThemeColor(ThemeColor.Primary)
                    .Icon("clipboard")
                    .Items(items=>{
                        items.Add().Id("keep-text").Text("Keep Text Only").Icon("clipboard-text").Click(@<text>function() { alert("Keep Text Only") }</text>);
                        items.Add().Id("paste-html").Text("Paste as HTML").Icon("clipboard-code").Click(@<text>function() { alert("Paste as HTML") }</text>);
                        items.Add().Id("paste-markdown").Text("Paste Markdown").Icon("clipboard-markdown").Click(@<text>function() { alert("Paste Markdown") }</text>);
                        items.Add().Id("paste-default").Text("Set Default Paste").Click(@<text>function() { alert("Set Default Paste") }</text>);
                    })
                )
            </div>
        </div>
    </div>

    @addTagHelper *, Kendo.Mvc

    @{
        var color_set = new string[] { "#f2f2f2", "#7f7f7f", "#a7d6ff", "#d9dde4", "#e5f5d7", "#fad0e4", "#fef0cd", "#c5f2ff", "#e2e7f4", "#c9f7f1" };
    }

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
            <kendo-colorpalette name="colorpalette" on-change="onChange"
                palette-colors="color_set">
            </kendo-colorpalette>
        </div>
        <div class="buttons-container">
            <div class='column'>
                <h4>Default Button:</h4>
                <kendo-dropdownbutton name="default" text="Paste" icon="clipboard">
                    <dropdownbutton-items>
                        <item id="keep-text" text="Keep Text Only" icon="clipboard-text"></item>
                        <item id="paste-html" text="Paste as HTML" icon="clipboard-code"></item>
                        <item id="paste-markdown" text="Paste Markdown" icon="clipboard-markdown"></item>
                        <item id="paste-default" text="Set Default Paste"></item>
                    </dropdownbutton-items>
                </kendo-dropdownbutton>
            </div>
            <div class='column'>
                <h4>Outline Button:</h4>
                <kendo-dropdownbutton name="outline" text="Paste" icon="clipboard" fill-mode="FillMode.Outline">
                    <dropdownbutton-items>
                        <item id="keep-text" text="Keep Text Only" icon="clipboard-text"></item>
                        <item id="paste-html" text="Paste as HTML" icon="clipboard-code"></item>
                        <item id="paste-markdown" text="Paste Markdown" icon="clipboard-markdown"></item>
                        <item id="paste-default" text="Set Default Paste"></item>
                    </dropdownbutton-items>
                </kendo-dropdownbutton>
            </div>
            <div class='column'>
                <h4>Primary Button:</h4>
                <kendo-dropdownbutton name="primary" text="Paste" icon="clipboard" theme-color="ThemeColor.Primary">
                    <dropdownbutton-items>
                        <item id="keep-text" text="Keep Text Only" icon="clipboard-text"></item>
                        <item id="paste-html" text="Paste as HTML" icon="clipboard-code"></item>
                        <item id="paste-markdown" text="Paste Markdown" icon="clipboard-markdown"></item>
                        <item id="paste-default" text="Set Default Paste"></item>
                    </dropdownbutton-items>
                </kendo-dropdownbutton>
            </div>
        </div>
    </div>

    <script>
        function onChange(e){
            let selectedColor = e.value;
            $.each($("[data-role='dropdownbutton']"), function(){
                $(this).css("background-color", selectedColor)
            });
        }
    </script>

4. Customize the Appearance of ColorPalette

You can customize the overall ColorPalette appearance by using the following options:

Use the Columns() method to specify the required number of columns.
The TileSize() configuration allows you to define the size of the color cell.

    @using Kendo.Mvc.UI

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
            @(Html.Kendo().ColorPalette()
                .Name("colorpalette")
                .Palette(new string[] {
                    "#f2f2f2", "#7f7f7f", "#a7d6ff", "#d9dde4", "#e5f5d7", "#fad0e4", "#fef0cd", "#c5f2ff", "#e2e7f4", "#c9f7f1"
                })
                .Columns(4)
                .TileSize(ts => ts.Width(50).Height(50))
            )
        </div>
    </div>

    @addTagHelper *, Kendo.Mvc
    @{
        var color_set = new string[] { "#f2f2f2", "#7f7f7f", "#a7d6ff", "#d9dde4", "#e5f5d7", "#fad0e4", "#fef0cd", "#c5f2ff", "#e2e7f4", "#c9f7f1" };
    }

    <div class="main-container">
        <div class="colorpalette-container">
            <h4>Select a color:</h4>
            <kendo-colorpalette name="colorpalette" columns="4"
                palette-colors="color_set">
                <tile-size width="50" height="50"/>
            </kendo-colorpalette>
        </div>
    </div>

5. (Optional) Reference Existing ColorPalette Instances

You can reference the ColorPalette instances that you have created and build on top of their existing configuration:

Use the value of the Name() option of the component to establish a reference.

    <script>
        $(document).ready(function() {
            var colorPaletteReference = $("#colorpalette").data("kendoColorPalette"); // colorPaletteReference is a reference to the existing ColorPalette instance of the helper.
        });
    </script>

Use the ColorPalette client-side API to control the behavior of the component. In this example, you will use the enable method to disable the control dynamically (for example, when a button is clicked).

    @(Html.Kendo().Button()
        .Name("btn")
        .Content("Disable ColorPalette")
        .Events(ev => ev.Click("onBtnClick")))

    @addTagHelper *, Kendo.Mvc

    <kendo-button name="btn" on-click="onBtnClick">
        Disable ColorPalette
    </kendo-button>

    <script>
        function onBtnClick() {
            var colorPaletteReference = $("#colorpalette").data("kendoColorPalette");
            colorPaletteReference.enable(false);
        }
    </script>

Explore this Tutorial in REPL

You can continue experimenting with the code sample above by running it in the Telerik REPL server playground:

Getting Started with the ColorPalette

Prerequisites

1. Prepare the CSHTML File

2. Initialize the ColorPalette

3. Implement the Color Changing

4. Customize the Appearance of ColorPalette

5. (Optional) Reference Existing ColorPalette Instances

Explore this Tutorial in REPL

Next Steps

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