add book

Qt6QMLBeginnersCode/6.Javascript/2-JsUsage/CMakeLists.txt

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+# Copyright (c) Daniel Gakwaya.
+# SPDX-License-Identifier: MIT
+
+cmake_minimum_required(VERSION 3.16)
+
+project(2-JsUsage VERSION 0.1 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt6 6.5 REQUIRED COMPONENTS Quick)
+
+qt_standard_project_setup(REQUIRES 6.5)
+
+qt_add_executable(app2-JsUsage
+    main.cpp
+)
+
+qt_add_qml_module(app2-JsUsage
+    URI 2-JsUsage
+    VERSION 1.0
+    QML_FILES Main.qml
+)
+
+set_target_properties(app2-JsUsage PROPERTIES
+    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
+    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
+    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
+    MACOSX_BUNDLE TRUE
+    WIN32_EXECUTABLE TRUE
+)
+
+target_link_libraries(app2-JsUsage
+    PRIVATE Qt6::Quick
+)
+
+install(TARGETS app2-JsUsage
+    BUNDLE DESTINATION .
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)

Qt6QMLBeginnersCode/6.Javascript/2-JsUsage/Main.qml

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+// Copyright (c) Daniel Gakwaya.
+// SPDX-License-Identifier: MIT
+
+import QtQuick
+
+Window {
+    visible: true
+    width: 640
+    height: 480
+    title: qsTr("JS")
+
+    Rectangle {
+        id: containerRectId
+        width: getHeight()  //JS in Function
+        height: 100
+        color: x > 300 ? "red" : "green" //property binding
+
+        //JS in signal handler
+        onXChanged: {
+            console.log("Current value of x: "+ x)
+        }
+
+        //Custom function
+        function getHeight()
+        {
+            return  height * 2
+        }
+    }
+
+    MouseArea {
+        anchors.fill: parent
+        drag.target: containerRectId
+        drag.axis: Drag.XAxis
+        drag.minimumX: 0
+        drag.maximumX: parent.width - containerRectId.width
+
+    }
+}

Qt6QMLBeginnersCode/6.Javascript/2-JsUsage/main.cpp

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+// Copyright (c) Daniel Gakwaya.
+// SPDX-License-Identifier: MIT
+
+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+
+
+int main(int argc, char *argv[])
+{
+
+    QGuiApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+    QObject::connect(&engine, &QQmlApplicationEngine::objectCreationFailed,
+        &app, []() { QCoreApplication::exit(-1); },
+        Qt::QueuedConnection);
+    engine.loadFromModule("2-JsUsage", "Main");
+
+    return app.exec();
+}