New to Telerik UI for ASP.NET AJAX? Download free 30-day trial

Responsive Types of Behavior

The Telerik UI for ASP.NET AJAX controls deliver a set of responsive behaviors that enable you to integrate them into the web design and provide responsive, adaptive, elastic, and fluid capabilities.


The following list defines the features of the responsive behaviors a control can acquire:

  • Fluid controls—A fluid control can take up 100% of the width of its parent and resize with it in real-time as opposed to stretching initially and not responding to changes in the size of the container. Fluid controls fill in their containing object in the HTML layout. Most Telerik ASP.NET AJAX controls now feature fluid behaviors.

    The fluid concept

    Sample of fluid behavior

  • Responsive controls—The responsive controls feature single HTML rendering and are adapted for various device and browser sizes in the browser through styles and scripts. The whole script and style information is transmitted to the browser, and with CSS media queries the browser presents the optimized layout for the control. A responsive control will have the same HTML rendering in all resolutions, but CSS rules or JavaScript logic may reorder, resize, or even hide certain elements from its UI to make it more suitable for the current dimensions. For more information, refer to the responsive control demos online.

    The responsive concept

    Sample of responsive behavior

  • Elastic controls—Elastic behavior means that the control will grow and shrink appropriately to maintain a size that is relative to the font-size in use on the web page. In this way, end users can zoom or change the font sizes in their browser, and allow the controls to size appropriately. This feature is usually achieved by using em units for font-size and padding settings. For more information, refer to the elastic control demos online.

    The elastic concept

    Sample of elastic behavior

  • Adaptive controls—Adaptive controls feature multiple HTML renderings with the appropriate styles to support various devices. Usually, at least one mode is optimized for mobile devices. When a page that contains an adaptive control is requested, the control defines on the server which HTML rendering is optimal for the browser and for the device which request the content. For more information, refer to the adaptive control demos online.

    The adaptive concept

    Sample of adaptive behavior

For more information on the responsive control types, refer to the assembled sample implementations of all of these features on the responsive web design sample website.

CSS Selectors for Elastic Design

The following example demonstrates the selectors for all controls that support elastic design and how setting the default font size of the page can affect all Telerik controls in it.

As of 2016 Q1 SP1 each Telerik® UI for ASP.NET AJAX control takes the font-size of the page automatically. If the developer does not set it explicitly (Example 1), this is up to the client's browser and a common default value is 16px.

Example 1: Setting default font for the page with the default value for the Telerik controls.

body {
    font-size: 20px;
    font-family: "Segoe UI", Arial, Sans-serif;

The following example provides the CSS selectors that enable you to resize the supported UI elements through a font-size change and demonstrates the elastic design capabilities of the controls.

/* AutoCompleteBox */ html .RadAutoCompleteBox, html .RadAutoCompleteBoxPopup,
/* Button */ html .RadButton,
/* Calendar */ html .RadCalendar,
/* ComboBox */ html .RadComboBox, html .RadComboBoxDropDown,
/* DataForm */ html .RadDataForm,
/* DataPager */ html .RadDataPager,
/* Dock */ html .RadDock,
/* DropDownList */ html .RadDropDownList, html .rddlPopup,
/* DropDownTree */ html .RadDropDownTree, html .rddtPopup,
/* Editor */    div.RadEditor,
                div.RadEditor .reToolbarWrapper,
                div.RadEditor .reToolBar
/* Filter */ html .RadFilter, html .RadMenu,
/* Gantt */ html .RadGantt,
/* ImageGallery */ html .RadImageGallery,
/* Input */ html .RadInput,
/* LightBox */ html .RadLightBox,
/* ListBox */ html .RadListBox,
/* Map */ html .RadMap,
/* MediaPlayer */ html .RadMediaPlayer,
/* Menu */ html .RadMenu,
/* Notification */ html .RadNotification,
/* PanelBar */ html .RadPanelBar,
/* PivotGrid */ html .RadPivotGrid,
                html .PivotGridWindow,
/* ProgressBar */ html .RadProgressBar,
/* Rating */ html .RadRating,
/* Rotator */ html .RadRotator,
/* SearchBox */ html .RadSearchBox, html .rsbPopup,
/* SiteMap */ html .RadSiteMap,
/* Slider */ html .RadSlider,
/* SocialShare */ html .RadSocialShare,
/* TagCloud */ .RadTagCloud,
/* Ticker */ body, /* or any other selector that will affect the ticker */
/* ToolTip */ html .RadToolTip,  
/* TreeMap */ html .RadTreeMap,
/* TreeList */ html .RadTreeList,
/* TreeView */ html .RadTreeView,
/* Window */ html .RadWindow {
    font-size: 24px;

The following example demonstrates the CSS selectors used for the RadFormDecorator elements and shows the elastic capabilities of the control. For more information, refer to the article on the elastic capabilities in the FormDecorator.

/* FormDecorator */
html.RadForm .rfdSkinnedButton,
html.RadForm .rfdTextInput,
html.RadForm.rfdLabel label,
html.RadForm.rfdLabel .rfdAspLabel,
html.RadForm.rfdTextbox input,
html.RadForm.rfdTextarea textarea,
html.RadForm.rfdFieldset fieldset,
html.RadForm.rfdFieldset legend,
html.RadForm .rfdSelect,
html.RadForm.rfdHeading h4,
html.RadForm.rfdHeading h5,
html.RadForm.rfdHeading h6,
html.RadForm .riTextBox,
html.RadForm .rfdValidationSummaryControl,
html.RadForm .rfdLoginControl {
    font-size: 24px;

/* Headings */
html.RadForm.rfdHeading h4 {
    font-size: 40px;
html.RadForm.rfdHeading h5 {
    font-size: 35px;
html.RadForm.rfdHeading h6 {
    font-size: 30px;

/* ListBox Styles */
html.rfdSelectBox {
    font-size: 24px;

/* drop down arrow positions should be tweaked */
html.RadForm .rfdDropDownArrow
    right: 10px;
    top: 10px;

/* checkboxes and radio buttons' positions should be tweaked */
html.RadForm .rfdCheckboxChecked .rfdToggleImage,
html.RadForm .rfdCheckboxUnchecked .rfdToggleImage,
html.RadForm .rfdRadioChecked .rfdToggleImage,
html.RadForm .rfdRadioUnchecked .rfdToggleImage
    top: 10px;

List of Controls with Responsive Behaviors

The following table lists the responsive capabilities of the Telerik UI for ASP.NET AJAX controls.

Control Elastic Fluid Responsive Adaptive
Ajax N/A N/A N/A N/A
AutoCompleteBox Yes Yes N/A N/A
Barcode N/A N/A N/A N/A
BinaryImage N/A N/A N/A N/A
Button Yes Yes No No
Calendar Yes Yes No No
Captcha N/A No N/A N/A
Chart (HTML5) N/A N/A (but possible) N/A (but possible) N/A
Chart N/A N/A N/A N/A
CheckBox Yes Yes No No
ColorPicker Yes No No No
ComboBox Yes Yes N/A N/A
DataForm Yes Yes No No
DataPager Yes Yes Yes Yes
Diagram N/A N/A N/A N/A
Dock Yes N/A Yes N/A
DropDownList Yes Yes N/A N/A
DropDownTree Yes Yes N/A N/A
Editor Yes Yes Yes Yes
FileExplorer Limited Yes No No
Filter Yes No No No
FormDecorator Yes Yes Yes N/A
Gantt Yes Yes Yes No
Gauge N/A N/A N/A N/A
Grid No Yes No Yes
ImageButton Yes Yes No No
ImageEditor Yes Yes No No
ImageGallery Yes Yes Yes Yes
Input Yes No N/A No
LightBox Yes Yes No Yes
LinkButton Yes Yes No No
ListBox Yes Yes N/A N/A
ListView No Yes No No
Map Yes Yes N/A N/A
MediaPlayer Yes Yes No Yes
Menu Yes Yes Yes (custom CSS) Yes
Notification Yes Yes Yes N/A
ODataDataSource N/A N/A N/A N/A
OrgChart Yes N/A N/A N/A
PanelBar Yes Yes N/A N/A
Persistence Framework N/A N/A N/A N/A
PivotGrid Yes Yes No No
Progress Area Yes Yes No No
Progress Bar Yes Yes Yes No
PushButton Yes Yes No No
Rating Yes No No N/A
RibbonBar Yes Yes No No
Rotator Yes Yes No N/A
Scheduler No Yes N/A Yes
SearchBox Yes No N/A N/A
SiteMap Yes Yes N/A N/A
Slider Yes Yes Yes N/A
SocialShare Yes Yes No No
Spell No No No No
Splitter Limited Yes Yes N/A
TabStrip Yes Yes N/A N/A
TagCloud Yes N/A Yes N/A
Ticker Yes Yes No N/A
Tile Yes Yes N/A N/A
TileList Yes Yes Yes Yes
ToolBar Yes Yes Yes N/A
ToolTip Yes N/A Yes N/A
ToggleButton Yes Yes N/A N/A
TreeMap Yes Yes No No
TreeList Yes Yes No No
TreeView Yes No N/A N/A
Upload (Async) Yes Yes No No
Upload (Cloud) Yes Yes No No
Window Yes No No N/A
Wizard Yes Yes Yes Yes
XmlHttpPanel N/A N/A N/A N/A
ZipLibrary N/A N/A N/A N/A

See also

In this article