SAPUI5 Custom Formatter Functions How to Use – Part 8 – sapui5 tutorial for beginners

Formatter functions are useful when the logic involved is complex for formatting properties of our data model.

In the app structure, we have added a new folder model. Inside it is placed formatter.js file. This file holds the custom formatter functions. The new folder structure looks as shown below.

sapui5 custom formatter function example
sapui5 custom formatter function example

In the view.xml file we have applied custom formatter function for property numberState and ObjectStatus text property. You can also check that in one function I have used path while for other parts is used. All the values of parts is passed as parameter to the custom formatter function. This also severs as an example for passing multiple parameter to custom formatter function. The call of formatter function starts with a “.”. A “.” basically indicates to look for function in the controller of the current view.

<List id="ProductList" headerText="{i18n>ListTitle}" 
      class="sapUiResponsiveMargin" width="auto" 
      items="{product>/Products}">
<items>
<ObjectListItem id="ObjectList" 
    title="{product>Quantity} x {product>ProductName}" 
    number="{path: 'product>ExtendedPrice'}"
    numberUnit="Dollars" 
    numberState="{path: 'product>ExtendedPrice', 
             formatter: '.formatter.numberState'}">
    <firstStatus>
	<ObjectStatus id="statustext" 
             text="{ parts: [										 
                      'product>ShipperName',										 
                      'product>ShippedDate',										 
                      'product>Status'], 
              formatter: '.formatter.statusText' }"/>
    </firstStatus>
</ObjectListItem>
</items>
</List>

We have to instruct App.controller.js file to load our formatter functions. Hence we define the path of formatter file in the sap.ui.define array so that it gets loaded as a formatter module. All the formatter functions is now available in the local property formatter to be able to access them in the view.

sap.ui.define([
	"sap/ui/core/mvc/Controller",
	"../model/formatter"
], function (Controller, formatter) {
	"use strict";

	return Controller.extend(
           "Amarmn.MyListApp.controller.App", {
		formatter: formatter
	});

});

Below piece of code is placed in the formatter.js file. Notice how we have received the paramters in custom formatter function and then returning the final result.

sap.ui.define([], function () {
	"use strict";
	return {
statusText: function (sShipperName, sShippedDate, sStatus)
{
var resourceBundle = 
this.getView().getModel("i18n").getResourceBundle();
var finalText = sShipperName + " " + sShippedDate + " ";
switch (sStatus) {
case "A":
return finalText + resourceBundle.getText("StatusA");
case "B":
return finalText + resourceBundle.getText("StatusB");
case "C":
return finalText + resourceBundle.getText("StatusC");
default:
	return finalText + sStatus;
}
},
numberState: function (sPrice) {
	if (sPrice > 10) {
	return "Error";
	} else {
	return "Success";
	}
}
};
});

Now update the i18n file with text.

PageTitle=SAPUI5 List Example
ListTitle=Products list below:

StatusA=Farm Fresh
StatusB=Local Market
StatusC=Super Market

Below is the output of our program.

sapui5 custom formatter function with paramters example
sapui5 custom formatter function with paramters example

Conclusion. SAPUI5 custom formatter function can be useful in many scenarios when like to change the value of data model or to apply a css to any control.

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