Trigger point for parsing Extension Point in SAP UI5 XML view

After parsing to the definition in the XML view ExtensionPoint, the instantiation process begins:

The working principle of Extension point is to predefine some extension points in the original application, and then developers can insert custom components or codes in these extension points to realize new functions. The advantage of this mechanism is that it can maintain the stability of the original application, and it is also convenient for expansion and maintenance.

Specifically, the usage of SAP UI5 Extension point is as follows:

1. Define an Extension point in the view of the original application. For example, in an XML view, you can define an Extension point with the following code:

<ExtensionPoint name="myExtensionPoint" />

This code defines an myExtensionPointExtension point called . At this Extension point, developers can insert custom UI components.

2. In extended applications, developers can implement extensions by defining an extended view. In the extension view, you can use the following code to reference and extend the original Extension point:

<core:ExtensionPoint name="myExtensionPoint">
    <Button text="My Custom Button" />
</core:ExtensionPoint>

This code myExtensionPointinserts a custom button at the Extension point. This button will myExtensionPointbe displayed at the location of the extension point of the original application.

In actual application, the situation of using Extension point may be more complicated. For example, the developer may need to handle some events in the component inserted by the extension point, or dynamically change the content of the extension point according to the state of the application. In this case, developers can write code in the controller that extends the view to implement these requirements. For example, the following code pops up a tooltip when a button is clicked:

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

    return Controller.extend("my.namespace.MyExtensionController", {
    
    
        onMyButtonPress: function() {
    
    
            MessageToast.show("My Custom Button Pressed");
        }
    });
});

This code defines a controller my.namespace.MyExtensionControllerand a method in that controller onMyButtonPress. This method is called when the custom button is clicked, and a prompt box will pop up displaying "My Custom Button Pressed".

The above is the basic concept and usage of SAP UI5 Extension point. In practical applications, developers can flexibly use this mechanism according to requirements to realize application extension and customization.