timer_test_main.qml

import QtQuick 2.2
import QtQuick.Controls 1.1
import "UpdateObject.js" as OutFunc

ApplicationWindow {
    id: main_window
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Rectangle {
        id: main_rect
        objectName: "main_rect"
        anchors.fill: parent

        Rectangle {
            id: r1
            anchors.centerIn: parent

            Text {
                id: main_text
                objectName: "main_text"
                text: qsTr("Hello World")

            }

        }

        Rectangle {
            id: r2
            anchors.top: r1.bottom
            anchors.topMargin: 5
            ListView {
                id: main_list
                objectName: "main_list"
                delegate: Text {
                    text: "blabla"
                }
                //model:3
            }

        }

        Timer {
            id: position_tracker
            interval: 300
            running: true
            repeat: true
            onTriggered: {

                if (OutFunc.getComponentByName(main_rect,"main_text") != null) {

                } else {
                    console.log("1 main_text = null!");
                }

                    if (OutFunc.getComponentByName(main_rect,"main_text") != null) {

                } else {
                    console.log("2 main_text = null!");
                }

                if (OutFunc.getComponentByName(main_rect,"main_list") != null) {

                } else {
                    console.log("1 main_list = null!");
                }

                if (OutFunc.getComponentByName(main_rect,"main_list") != null) {

                } else {
                    console.log("2 main_list = null!");
                }
            }
        }

    }

}