how to find children length of a window

ashajg

Hi guys

I want to find length of children in a window

In my main.qml I am writing a function

function getGroupRef()
  {
      var length=parent.children.length
      console.log("MaInWiNdOw children length---->"+length)
  }

Main.qml

import QtQuick 2.9
import QtQuick.Window 2.2
import QtQuick 2.9
import "qrc:/MasterController.js" as Controll

Window {
    id:mainWindow
    visible: true

    width: 800
    height: 600
    title: qsTr("Hello World")


        Component.onCompleted:
        {
            console.log ("triggered")
            Controll.createGroup();
           
        }





    function getGroupRef()
    {
        var length=mainWindow.children.length
        console.log("MaInWiNdOw children length---->"+length)
    }

    MouseArea
    {
        anchors.fill:parent
        onClicked:getGroupRef()
    }

}

MasterController.js

var sprite
var groupComponent;
var groupComponentTwo;
var ventGroupContainer;
var barButtonContainer;
var myList=[];
var myCompNames=["ventbutmod","qkeyWidget1","qkeyWidget2","qkeyWidget3","qkeyWidget4","moreset","buttonBar0","buttonBar1","buttonBar2"];




function createGroup()
{
    console.log("inside Create Group")

    groupComponent = Qt.createComponent("qrc:/VentGroup.qml");
    groupComponentTwo=Qt.createComponent("qrc:/ButtonBarGroup.qml");
    if(groupComponent.status === Component.Ready && groupComponentTwo.status === Component.Ready){
        finishGroupCreation();}

    else
    {
        groupComponent.statusChanged.connect(finishGroupCreation);
        groupComponentTwo.statusChanged.connect(finishGroupCreation)
    }

}

function finishGroupCreation()
{
    console.log("inside finishgroupcreation")
      barButtonContainer=groupComponentTwo.createObject(mainWindow)
    ventGroupContainer=groupComponent.createObject(mainWindow)

}

ERROR:

qrc:/main.qml:47: TypeError: Cannot read property 'length' of undefined

In this program I am creating two components using .js . when I am trying to fetch children length of mainWindow which should be 2(ventgroup and buttonBargroup). I am getting error .
How can I solve this?

raven-worx

@ashajg
Window is not a visual QML item neither does it have a children property thus the error.

I haven't tested the following but i think it's closer to what you try to achieve:

var length=mainWindow.contentItem.children.length

ashajg

@raven-worx said in how to find children length of a window:

var length=mainWindow.contentItem.children.length

hi

this line var length=mainWindow.contentItem.children.length is giving me answer as 3.
What is contentItem ?

Actually I am trying to fetch Objectnames of Ventgroup.qml and ButtonBargroup.qml

something like this

function getReference(objectName)
{
    var length = mainWindow.children.length
    console.log("length of children is "+length)
    for(var i=0;i<length;i++)
    {
        if(objectName===mainWindow.children[i].objectName)
        {
            console.log("FOUND");
            return mainWindow.children[i];

        }
    }
}

basically I am trying to fetch mainWindow.children[i]; so that I can manuplate properties of this group from my .js
any idea?

raven-worx

@ashajg said in how to find children length of a window:

What is contentItem ?

the contentItem is the visual item holding the child items in the window

ashajg

ok

I was able to get it like this

```

function getGroupRef(groupName)
    {
        var length=mainWindow.contentItem.children.length

        console.log("MaInWiNdOw children length---->"+length)
        for(var i=0;i<length;i++)
        {
            if(mainWindow.contentItem.children[i].objectName===groupName)
            {
            console.log("found at :"+i)
                return mainWindow.contentItem.children[i];
            }
        }
       // console.log("MaInWiNdOw children name---->"+mainWindow.contentItem.children[2].objectName)
    }

J.Hilk

@ashajg
great, that it's now working for you.

Don't forget to set the topic to solved, via topic tools.

ashajg

yes
Thank you!!!