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Resposnive, Adaptive and Elastic Capabilities

This article explains the elastic capabilities RadTagCloud offers. The control supports elastic design since Q2 2014.

Generally, elastic design means that the page and its content are able to adapt to different font size by scaling the elements properly depending on the chosen font-size.

Figure 1: Comparison between appearances of a RadTagCloud with two different values for font size.


RadTagCloud supports changing the font size without breaking the control's appearance - if the new size is larger than the original, the elements of the tag cloud will simply increase their size as well to accommodate the text inside. This fluid layout is achieved by using em units for setting dimensions and paddings in the control, instead of px because em units are tied to the font size. This allows dimensions and sizes to scale with the font size.

If you configure the MinFontSize and MaxFontSize properties of RadTagCloud in pixels or without specifying a unit, the text in the tag cloud will not be scaled, because the font size of the items will be calculated in pixels. It is recommended to set these properties in em units to ensure that the whole control will be resized according to the chosen font size.

To use the elasticity of the RadTagCloud change the font size of the control's element (Example 2). As a result the sizing of the tags is proportionally changed (Figure 1).

As of 2016 Q1 SP1 RadTagCloud 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;

Example 2: The font size of RadTagCloud is set to 20px.

<style type="text/css">
    div.RadTagCloud {
        font-size: 20px;
<telerik:RadTagCloud RenderMode="Lightweight" ID="RadTagCloud1" runat="server" Width="400px">
        <telerik:RadTagCloudItem Text="ASP.NET" Weight="12"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="AJAX" Weight="134"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="VB" Weight="56"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="C#" Weight="38"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="Web" Weight="73"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="jQuery" Weight="23"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text=".NET" Weight="78"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="Code" Weight="50"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="UI" Weight="80"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="Unit" Weight="20"></telerik:RadTagCloudItem>
        <telerik:RadTagCloudItem Text="Class" Weight="50"></telerik:RadTagCloudItem>

See Also

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