Embedding custom CSS style class to SAPUI5 control – Part 4- SAPUI5 Programming for Beginners

There might be requirement when you may have to Style SAPUI5 control using CSS and you might be wondering How to add custom CSS to SAPui5 controls? Many clients follow their own custom branding theme and you can achieve this By applying custom CSS style class to SAPui5 controls.

CSS stands for cascading style sheets And it can help In dramatically Change the look and feel of our application. SAPUI5 provides the flexibility of adding custom style classes to SAPUI5 controls. You first need to add CSS file in SAPui5 application structure. This CSS file will hold all custom CSS style classes to embed to the SAPui5 controls.

How to add CSS file in SAPUI5

Right-click webapp to create a folder css. Inside folder css create file style.css. The SAPUI5 app structure will look like below image.

how to add css file in sapui5
how to add css file in sapui5

In manifest.json file, under SAPUI5 namespace we define the css file URL relative to the component.js file. Any additional resources that needs to be loaded for the SAPUI5 app must be defined in the resources section in manifest.json file.

SAPUI5 MANIFEST.JSON FILE ADDING CSS FILE
SAPUI5 MANIFEST.JSON FILE ADDING CSS FILE
"resources": {
	"css": [{
		"uri": "css/style.css"
		}]
},

Embedding custom CSS style class to SAPUI5 control

In style.css file, we create our custom classes combined with custom namespace class. We have to ensure that CSS gets applied only on controls that are within our app and it does not affect same controls outside our app.

In Order to override the existing css of the base theme, we apply custom CSS style class along with base theme CSS class to make our selector more specific . In CSS the rule with the most specific selector will prevail.

Inspect SAPUI5 app control to find the base theme CSS class

The steps of inspecting theme CSS class is the same like any other application and you might be aware of it.

Right-click on Chrome browser and select inspect. Click on inspect icon, and place cursor on the element to be inspected for CSS.

sapui5 inspect sapui5 control for css
sapui5 inspect sapui5 control for css

As soon as we click on text, it shows the base theme CSS class, that I have highlighted in the below image. Any change done on this class will change the look of the SAPUI5 text element.

sapui5 inspect sapui5 control for css
sapui5 inspect sapui5 control for css

We apply custom namespace class to the app control as well . This class will have no styling but is very important as it will be used in the definition of the CSS rules to define CSS selectors so that the CSS are valid only for this app.

Below are code changes done in the view.xml file. We have added Shell, App and Page containers. Also, custom class “myApp” is applied to App and custom class “myCustomText” is applied to Text control.

<mvc:View controllerName="Amarmn.MyFirstApp.controller.App" 
 xmlns="sap.m" xmlns:mvc="sap.ui.core.mvc">
<Shell id="myShell">
<App id="myApp" class="myApp">
<pages>
<Page id="myPage" title="{i18n>homePageTitle}">
<content>
<Button id="button" text="{i18n>buttonText}" 
        press=".onPress"/>
<Input id="input1" value="{/employee/name}" 
       valueLiveUpdate="true" width="60%"/>
<Text id="text" text="Hello {/employee/name}" 
      class="myCustomText"></Text>
</content>
</Page>
</pages>
</App>
</Shell>
</mvc:View>

Code in style.css file.

.myApp .myCustomText.sapMText {
    color: #bb0000;
    font-weight: bold;
}
Embedding custom CSS style class to SAPUI5 control
Embedding custom CSS style class to SAPUI5 control

Following the above process for embedding custom CSS style class to SAPUI5 control gives correct results.

Change the look of Button using CSS

Apply the class code to button.

<Button 
id="button" 
class="myCustomButton" 
text="{i18n>buttonText}" 
press=".onPress"/>

Make changes in the css file. Add myCustomButton class.

.myCustomButton>.sapMBtnInner{
	border: 0px solid #ababab;
    border-bottom: 3px solid;
    border-color: red;
    border-radius: 0.2rem;
    color: #333333;
}

Below is the output.

CSS applied to SAPUI5 button
CSS applied to SAPUI5 button

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