Button Appearance

As of the R1 2022 release, the Button uses a brand new rendering.

In this article, you will find information about the new rendering of the Telerik UI for ASP.NET Core Button.

For additional information regarding the decision behind these changes, visit the Components Rendering article.

For a complete example, refer to the Appearance Demo of the Button.

Options

The Button HtmlHelper provides the following methods for styling:

• Size()—configures the overall size of the component.
• ThemeColor()—configures what color will be applied to the component.
• FillMode()—defines how the color is applied to the Button.
• Rounded()—determines the border radius of the component.

Size

To control the size of the Button, configure the Size option with any of the following values:

• Small
• Medium - the default size
• Large
• None

@(Html.Kendo().Button()
    .Name("textButton")
    .Size(ComponentSize.Medium)
    .HtmlAttributes( new {type = "button"} )
    .Content("Text Button")
)

<kendo-button name="textButton"
              size="ComponentSize.Medium">
    Text Button
</kendo-button>

FillMode

The FillMode() method specifies how the color is applied to the component. The default Button fill mode is Solid.

@(Html.Kendo().Button()
    .Name("textButton")
    .FillMode(ButtonFillMode.Solid)
    .HtmlAttributes( new {type = "button"} )
    .Content("Text Button")
)

<kendo-button name="textButton"
              fill-mode="ButtonFillMode.Solid">
    Text Button
</kendo-button>

The following options are available for the FillMode configuration:

• Solid
• Outline
• Flat
• Link
• Clear
• None

ThemeColor

The ThemeColor configuration provides a variety of colors that can be applied to the Button. The available options are:

• Base
• Primary
• Secondary
• Tertiary
• Info
• Success
• Warning
• Error
• Dark
• Light
• Inverse

The default ThemeColor is Base.

@(Html.Kendo().Button()
    .Name("textButton")
    .ThemeColor(ThemeColor.Base)
    .HtmlAttributes( new {type = "button"} )
    .Content("Text Button")
)

<kendo-button name="textButton"
              theme-color="ThemeColor.Base">
    Text Button
</kendo-button>

Rounded

The border radius of the Button can be customized through the Rounded() method. The default option is Medium.

@(Html.Kendo().Button()
    .Name("textButton")
    .Rounded(ButtonRounded.Medium)
    .HtmlAttributes( new {type = "button"} )
    .Content("Text Button")
)

<kendo-button name="textButton"
              rounded="Rounded.Medium">
    Text Button
</kendo-button>

The following values are available for the Rounded option:

• Small
• Medium
• Large
• Full
• None

Old vs New Rendering

The old rendering of the component consisted of a button element with a single class named k-button. The k-button held all the styling information related to the Button component.

 <!-- OLD -->
<button class='k-button'></button>

Currently, styles are split in multiple class names. Each class is scoped to a single button appearance property:

<!-- NEW -->
<button class="k-button k-button-solid-base k-button-solid k-button-md k-rounded-md" >
</button>

Primary Button

The k-primary class is substituted with the appropriate ThemeColor class. For example, when FillMode is Solid, that class is k-button-solid-primary.

 <!-- OLD -->
<button class="k-button k-primary">
        Primary Button
</button>

<!-- NEW -->
<button class="k-button k-button-md k-rounded-md k-button-solid k-button-solid-primary">
        Primary Button
</button>

Flat Button

The k-flat class is substituted with the appropriate FillMode and ThemeColor classes. For example, when ThemeColor is Base those are: k-button-flat and k-button-flat-base.

 <!-- OLD -->
<button class="k-button k-primary">
        Flat Button
</button>

<!-- NEW -->
<button class="k-button k-button-md k-rounded-md k-button-flat k-button-flat-base">
        Flat Button
</button>

Button with Icon

With the old rendering, the k-button-icon class was used for the Buttons with icons. The k-button-icon class is now used on the icon element itself. In case the button contains only an icon and no text, the k-icon-button is used for the button element. The k-button-icontext class is removed.

<button class="k-button k-button-icontext">
        <span class=" k-icon k-i-folder"></span>
        Button
</button>

<button class="k-button k-button-icon">
        <span class="k-icon k-i-folder"></span>
</button>

<button class="k-button k-button-solid k-button-md k-rounded-md k-button-solid-base">
    <span class="k-button-icon k-icon k-i-folder"></span>
    <span class="k-button-text">Button</span>
</button>

<button class="k-button k-button-solid k-button-md k-rounded-md k-button-solid-base k-icon-button">
    <span class="k-button-icon k-icon k-i-folder"></span>
</button>

Visual Backwards Compatibility

To achieve the same look and feel as the old rendering, the references of the element must be updated. Visit the CSS Classes Migration and JQuery Selectors Migration sections of the Components Rendering article for additional information.

The new styling and rendering supports only the default options when a LESS theme is used.

A reference to the button element still can be obtained through the k-button class.

$(".k-button") // Returns a reference to the button element in the old and the new rendering.

The following example showcases how to customize the styles of the Button with configured icon in both the new, and the old rendering:

      <style>  
        .k-button .k-button-icon{ /* applies pink background to the icon elements with version 2022 R1 and later; applies pink background to the entire icon button in version prior to 2022 R1; */
          background-color: pink
        }
        .k-button.k-icon-button{ /* applies ornage border to the entire icon button in 2022 R1 and later; */
          border: 3px solid orange;
        }        
      </style>

See Also

• Appearance of the Button HtmlHelper for ASP.NET Core (Demo)
• Button Server-Side API
• Button Client-Side API