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Step 2: Bootstrap

Before we can do something with OpenUI5, we need to load and initialize it. This process of loading and initializing OpenUI5 is called bootstrapping. Once this bootstrapping is finished, we simply display an alert.

Preview

Coding

You can view and download all files at Walkthrough - Step 2.

UI5 Tooling

First, let's enhance your UI5 Tooling setup:

Open a terminal from the app root folder.
Execute ui5 use OpenUI5
Execute ui5 add sap.ui.core sap.m themelib_sap_horizon

webapp/index.html

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>UI5 Walkthrough</title>
	<script
		id="sap-ui-bootstrap"
		src="resources/sap-ui-core.js"
		data-sap-ui-theme="sap_horizon"
		data-sap-ui-libs="sap.m"
		data-sap-ui-compat-version="edge"
		data-sap-ui-async="true"
		data-sap-ui-on-init="module:ui5/walkthrough/index"
		data-sap-ui-resource-roots='{
			"ui5.walkthrough": "./"
		}'>

	</script>
</head>
<body>
<div>Hello World</div>
</body>
</html>

In this step, we load the OpenUI5 framework from the webserver provided by UI5 Tooling and initialize the core modules with the following configuration options:

The id attribute of the <script> tag has to be exactly "sap-ui-bootstrap" to ensure proper booting of the SAPUI5 runtime.
The src attribute of the <script> tag tells the browser where to find the OpenUI5 core library – it initializes the OpenUI5 runtime and loads additional resources, such as the libraries specified in the data-sap-ui-libs attribute.
The OpenUI5 controls support different themes. We choose sap_horizon as our default theme.
We specify the required UI library sap.m, which contains the UI controls we need for this tutorial.
To make use of the most recent functionality of OpenUI5 we define the compatibility version as edge.
We configure the bootstrapping process to run asynchronously. This means that the OpenUI5 resources can be loaded simultaneously in the background for performance reasons.
We define the module to be loaded initially in a declarative way. With this, we avoid directly executable JavaScript code in the HTML file. This makes your app more secure. We'll create the script that this refers to further down in this step.
We tell OpenUI5 core that resources in the ui5.walkthrough namespace are located in the same folder as index.html.

webapp/index.js (New)

sap.ui.define([], () => {
	"use strict";
	alert("UI5 is ready");
});

Now, we create a new index.js script that contains the application logic for this tutorial step. We do this to avoid having executable code directly in the HTML file for security reasons. This script will be called from index.html. We defined it there as a module in a declarative way.