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Step 9: Formatting Values

We’d also like to provide our users with a way of contacting Harry Hawk, so we’re adding a link that sends an e-mail to Harry. To do this, we convert our data in the model to match the sap.m.URLHelper.normalizeEmail API. As soon as the user changes the name, the e-mail also changes. We need a custom formatter function for this.

Preview

An e-mail link is added to the address panel

The graphic has an explanatory text

Coding

You can view and download all files in the Demo Kit at Data Binding - Step 9.

Create a new folder named controller within your webapp folder as a general location for all controller files for this app. Next, create a new file named App.controller.js with the following content:

webapp/controller/App.controller.js (New)
```
sap.ui.define([
	"sap/m/library",
	"sap/ui/core/mvc/Controller"
], (mobileLibrary, Controller) => {
	"use strict";
    
	return Controller.extend("ui5.databinding.controller.App", {
		formatMail(sFirstName, sLastName) {
			const oBundle = this.getView().getModel("i18n").getResourceBundle();
    
			return mobileLibrary.URLHelper.normalizeEmail(
				`${sFirstName}.${sLastName}@example.com`,
				oBundle.getText("mailSubject", [sFirstName]),
				oBundle.getText("mailBody"));
		}
	});
});
```
In our custom formatter, we set the first and last name currently in the model as function parameters. When a user changes the data in the model by entering a different name in the input fields, our formatter will be invoked automatically by the framework. This ensures that the UI stays in sync with the data model.

In the formatMail function, we use the sap.m.URLHelper.normalizeEmail function that expects an e-mail address, a mail subject, and a text body. When a user follows the link, their default email client will open with these parameters.For more information, see API Reference: sap.m.URLHelper.normalizeEmail. The mailSubject resource bundle text contains a placeholder for the recipient’s first name (see below). Therefore, we provide the name with [sFirstName].

Note:

For a detailed description of the e-mail link format, see https://developer.mozilla.org/de/docs/Web/Guide/HTML/Email_links.
Enhance the App.view.xml file as shown below:

webapp/view/App.view.xml
```
<mvc:View
	controllerName="ui5.databinding.controller.App"
	xmlns="sap.m"
	xmlns:form="sap.ui.layout.form"
	xmlns:l="sap.ui.layout"
	xmlns:mvc="sap.ui.core.mvc">
	...
	<Panel headerText="{i18n>panel2HeaderText}" class="sapUiResponsiveMargin" width="auto">
		<content>
			<l:VerticalLayout>
				<Label labelFor="address" text="{i18n>address}:"/>
				<FormattedText class="sapUiSmallMarginBottom"
					htmlText="{/address/street}&lt;br&gt;{/address/zip} {/address/city}&lt;br&gt;{/address/country}"
					id="address" width="200px"/>
				<Link href="{
						parts: [
							'/firstName',
							'/lastName'
						],
						formatter: '.formatMail'
					}"
					text="{i18n>sendEmail}"/>
			</l:VerticalLayout>
		</content>
	</Panel>
</mvc:View>
```
For more complex bindings, we can’t use the simple binding syntax with the curly braces anymore. The href property of the Link element now contains an entire object inside the string value. In this case, the object has two properties:
- parts
  
  This is a JavaScript array in which each element is a string representing a path property. The number and order of the elements in this array correspond directly to the number and order of parameters expected by the formatMail function.
- formatter
  
  This is a reference to the function that receives the parameters listed in the parts array. Whatever value the formatter function returns becomes the value set for the href property. The dot (formatMail) at the beginning of the formatter tells OpenUI5 to look for a formatMail function on the controller instance of the view. If you don’t use the dot, the function will be resolved by looking into the global namespace.
Note:

When using formatter functions, the binding automatically switches to “one-way”. Therefore, you can’t use a formatter function for “two-way” scenarios. However, you can use data types (which we explain in the following steps).

Add the # E-mail section to the i18n.properties and i18n_de.properties files as shown below.

webapp/i18n/i18n.properties

…
# Screen titles
panel1HeaderText=Data Binding Basics 
panel2HeaderText=Address Details
    
# E-mail
sendEmail=Send Mail
mailSubject=Hi {0}!
mailBody=How are you?

webapp/i18n/i18n_de.properties

…
# Screen titles
panel1HeaderText=Data Binding Grundlagen
panel2HeaderText=Adressdetails
    
# E-mail
sendEmail=E-mail versenden
mailSubject=Hallo {0}!
mailBody=Wie geht es dir?

Parent topic:Data Binding Tutorial

Next:Step 8: Binding Paths: Accessing Properties in Hierarchically Structured Models

Previous:Step 10: Property Formatting Using Data Types

Related Information

Formatting, Parsing, and Validating Data

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Step 9: Formatting Values

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Coding

Note:

Note: