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Setting Themes

You define which theme is used by your app either by using the theme configuration parameter or the sap/ui/core/Theming.setTheme method.

• By default, there is a default theme configured for each OpenUI5 version that is applied, if not configured differently. The following example shows how to overwrite the OpenUI5 default theme as part of the bootstrap configuration:

  <script id="sap-ui-bootstrap"
      type="text/javascript"
      src="resources/sap-ui-core.js"
      data-sap-ui-theme="my_custom_theme">
  </script>
  

• It is also possible to change the theme using any other source for configuration options, such as a URL parameter (for example, html?sap-ui-theme=my_custom_theme).

• Note:

  You can provide the theme parameter either as sap-theme or sap-ui-theme. The only exception is the globalThis["sap-ui-config"] object where only theme is valid, since a parameter must not be prefixed within the globalThis object. The configuration uses the sap-theme value, if both notations exist.

  If you use the UI theme designer to define your own custom theme, you can append the location of the custom theme as a server-relative path to the theme parameter, separated by an @ sign:

  http://myserver.com/sap/myapp/?sap-ui-theme=my_custom_theme@/sap/public/bc/themes/~client-111
  

  Although a full URL can be specified, the framework will only use the path information of the URL to prevent CSS-based attacks that would otherwise be possible by referencing CSS from a malicious server, unless the origin has been added to sap-allowed-theme-origins. For more information, see Theme Origin Allowlist. In a more complex landscape, for example, if the infrastructure of the UI theme designer is running on a separate server, a Web dispatcher can be used to combine both servers in one endpoint.

  Note:

  The UI theme designer infrastructure stores themes for multiple technologies in the same location, each in its own subdirectory (UI5/ for OpenUI5). Other SAP products (such as SAP Enterprise Portal) append only the common root URL to the theme parameter. OpenUI5 therefore appends folder UI5/ to any given path that is defined in the theme parameter.

• You can use the sap/ui/core/Theming.setTheme method to switch themes during runtime. When setting the theme parameter via API, the application state is not lost, and only the style sheets are exchanged.

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Using Custom Themes

To load an external custom theme, you can either declare it statically on the page or by setting the theme-root configuration parameter.

• You can configure the theme by using one of the following options:

  • Use the same object structure as JSON string in an attribute of the OpenUI5 bootstrap script tag, for example:

    <script id="sap-ui-bootstrap" 
    	type="text/javascript"
    	src="resources/sap-ui-core.js"
    	data-sap-ui-theme-roots='{"my_custom_theme" : "http://themes.org/ui5"}'>
    </script>
    

  • Specify the location of a theme with a URL parameter:

    http://myserver.com/sap/myapp/?sap-ui-theme=my_custom_theme@/sap/public/bc/themes/~client-111
    

  • Use the global configuration object. Create and load an additional <additional-config.js> file with the following content:

     // Be mindful of already existing configuration options
        globalThis["sap-ui-config"] ??= {};
        globalThis["sap-ui-config"] = Object.assign(globalThis["sap-ui-config"]["theme-roots"] || {}, {
            "my_preconfigured_theme" : "http://preconfig.com/ui5-themes",
            "my_second_preconfigured_theme" : {
                "" : "http://preconfig.com/ui5-themes",
                "sap.ui.core" : "http://core.com/ui5"
            }
        });
    

    The first theme is loaded for all libraries from the location specified. The second theme is loaded for the sap.ui.core library from the location specified. For all other libraries, the theme is loaded from the default location.

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Theme Origin Allowlist

When configuring a theme with a themeRoot URL via the theme parameter, security restrictions apply. Absolute URLs to an origin other than the current page are cut off by default. The path segment will be resolved relative to the current page origin.

In order to allow other origins to be used via the URL parameter, the sap-allowed-theme-origins configuration option can be used:

<meta name="sap-allowed-theme-origins" content="https://example.com">

This allows you to load a theme from https://example.com, which is provided via the URL parameter:

https://myserver.com/sap/myapp/?sap-theme=my_theme@https://example.com/custom-themes/

Note:

sap-allowed-theme-origins can only be provided using bootstrap or the <meta> tag. Origins provided via configuration must contain the same protocol, host, and port as the origin provided in the theme parameter. Multiple allowed origins can be separated by a comma.

A general wildcard (*) can also be used to allow all origins. However, this should only be used in combination with additional security mechanisms, such as CSP style-src directives. Wildcards to allow sub-domains are not supported.

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Listening to the Theming.applied Event

Whenever the theme is switched, an event is fired indicating that a theme switch has been triggered. If your application needs to take theming into consideration, attach an event handler, like this:

sap.ui.require([
    "sap/ui/core/Theming"
], (
    Theming
) => {
    "use strict";
     
    // Whenever the theme is switched, an event is fired,
    // indicating that a theme switch has been triggered.
    Theming.attachApplied((oEvent) => {
        // Note: The event callback has no longer a <this> context,
        // thus we use an arrow function here
 
        // Note: the Event object now has a different API than on the Core facade:
        // no more getParameters(), but simple properties like the Web API events.
        // Therefore, you can access the new "theme" like so:
        const sTheme = oEvent.theme;
    });
    ...
});

Note:

The handler of the applied event will be executed immediately once if all *.css files are loaded and there are no further requests pending for the theme.

After that, it will only be executed in case of new *.css files, which may happen for a complete theme change or the loading of additional libraries. Keep in mind that the onThemeChanged hook is not executed initially if the theme has already been applied.

For more information, see the API Reference.

Related Information

Available Configuration Options

API Reference: sap/ui/core/Theming.setTheme

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