QML - Lesson 010. Access to child objects in TabView

Qt, QML, reference error, TabView

The structure of objects in Qml is a tree in which to access the properties of objects underlying level please refer to the original object, then select the child object and select the child object property to which you want to access.

But in the case TabView this approach does not work, because the objects tabs added dynamically, so you need to access the tab on its index, pick up an object from the item and find it of interest to us a child object in this item also on the index. And then get access to the property of interest to us. It is also recommended to note that in this case, the code does not work completion QtCreator .

And most likely you will get an error as follows:

ReferenceError: 'something' is not defined

Project structure for TabView

In this example, a project created by default will be used:

  • QmlTableView.pro - the profile of the project;
  • main.cpp - the main file C ++ source code;
  • main.qml - file source qml-layer.


As the draft amended only main.qml file, then I will not go into the description of the files that are created by default.

As for the file, then work the next application logic. There is the main application window in which the object and Button object TabView. In TabView are two tabs, one of which is placed the second button. Pressing the first button changes the text in the second, by pressing the second button changes the text of the first button.

import QtQuick 2.5
import QtQuick.Controls 1.4

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Qml TabView")

    // Button, by pressing a button to change the text in the object Tab
    Button {
        id: button
        text: qsTr("Кнопка 1")
        anchors.top: parent.top
        anchors.topMargin: 5
        anchors.left: parent.left
        anchors.leftMargin: 5

        /* Taking the tab with the target button, 
         * then the object that forms the pad tabs. 
         * Then isolate the desired child of the index. 
         * And this object take the required property, 
         * ie, the text that is assigned to the new text value
         * */
        onClicked: {
            tabView.getTab(0).item.children[0].text = "Button 1"

    /* TabView, in the first tab, which contains the button, 
     * by pressing a button to change the text of the first button
    TabView {
        id: tabView
        anchors.top: button.bottom
        anchors.topMargin: 5
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.bottom: parent.bottom

        Tab {
            id: tab1
            title: qsTr("First tab")

            component: Item {
                id: rect1

                Button {
                    id: buttonTab
                    text: qsTr("Button 2")
                    anchors.top: parent.top
                    anchors.topMargin: 5
                    anchors.left: parent.left
                    anchors.leftMargin: 5

                    /* Rewrite the text value of the first button
                     * */
                    onClicked: {
                        button.text = "Button 2"

        Tab {
            id: tab2
            title: qsTr("Second Tab")


As a result of the work done you will be able to gain access to child objects in the tabs TabView.


We recommend hosting TIMEWEB
We recommend hosting TIMEWEB
Stable hosting, on which the social network EVILEG is located. For projects on Django we recommend VDS hosting.
Support the author Donate

Добрый день, не совсем понятна закономерность вызовов, то есть

здесь любой объект.get (0/*индекс*/). Если у меня нет группы что будет.children[0].text 
можно более подробно ?

не обязательно, но вполне возможно, children возвращает контейнер со всеми дочерними объектами, которые находятся в текущем объекте.

Этот метод идёт ещё из QObject. Потом можно в цикле по objectName искать нужный объект.


Only authorized users can post comments.
Please, Log in or Sign up

Hello, Dear Users of EVILEG!!!

If the site helped you, then support the development of the site financially, please.

You can do it by following ways:

Thank you, Evgenii Legotckoi

Feb. 16, 2020, 1:05 p.m.

C++ - Test 001. The first program and data types

  • Result:20points,
  • Rating points-10
Feb. 16, 2020, 12:52 p.m.

C++ - Тест 003. Условия и циклы

  • Result:50points,
  • Rating points-4
Feb. 16, 2020, 12:39 p.m.

Qt - Test 001. Signals and slots

  • Result:84points,
  • Rating points4
Last comments
Feb. 16, 2020, 1:36 p.m.

Добрый вечер! Монжно по подробней о теге get_companion? ссылка не работает.
Feb. 16, 2020, 9:35 a.m.
Evgenij Legotskoj

Добрый день. На GitHub исходники, можете посмотреть в официальном репозитории
Feb. 16, 2020, 9:29 a.m.

Здравстсвуйте Евгений, непонятно мне где эти исходники найти?
Feb. 12, 2020, 3:30 a.m.
Pavel Bogdevich

Это не то, мне нужно именно делегат отредактировать (без изображения)
Now discuss on the forum
Feb. 16, 2020, 2:13 p.m.

Всем привет. есть те кто сталкивался с данной прогой? Нужна наводка просто как правильно из кучи инфы что содержит файл trace.dat и скармливается kernelshark вытащить причину долгого с…
Feb. 16, 2020, 11:35 a.m.
Igor' Poroshin

#include <QSqlError>#include <QSqlQuery>...if (!model->select()) { qDebug() << model->lastError().text(); qDebug() << model->query().lastQue…
Feb. 16, 2020, 11:25 a.m.

Вот моя модель так выглядит SupportedPowerStatesModels::SupportedPowerStatesModels(QVector<SupportedPowerStates * > vector) : m_vector(std::move(vector)){}int SupportedPowerState…
Feb. 16, 2020, 10:34 a.m.

Yes, I can but I do not like to spend much time on this. And not sure I can subclass from QAbstractSeries as it does not have custom delegates examples and put any item inside it. PathView insid…
Feb. 14, 2020, 8:49 a.m.
Ruslan Polupan

Нашел функцию с тарых исходниках php function IntToColor ($v){ return sprintf("%02X%02X%02X",$v&0xFF,($v>>0x8)&0xFF,($v>>0x10)&0xFF);} Может кто помочь адапти…
© EVILEG 2015-2019
Recommend hosting TIMEWEB