As a first simple approach to achieve that, you can for example add properties for the data to your main.qml:

Rectangle {
  id: main

  // myData property will be available in all sub-items of main
  property alias myData: dataItem 

  Item {
    id: dataItem
    property string name: ""
    property string course: ""
    // ... other data properties
  }
}

In your pages, you can then access the values using e.g. myData.name or myData.course.
Just display the value in the third page, and make sure to save the value to these properties in the pages where you enter the data.

This setup also ensures that you do not lose the data when pages are destroyed after you e.g. remove them from the StackView.

Cheers,
GT

I will explain my concept clearly

Here i have three qml files. The first.qml and second.qml have some textfields.

first.qml

item{

name textfield
age textfield
DOB textfield

}

second.qml

Item{

college textfield
course textfield
dept textfield

}

third.qml
{

display the enter textfield value in any form.
}

main.qml

rectangle{

Inside the rectangle the load the first , second and third qml pages using stack view.

}
the two buttons next and back button appear in every page to switch qml views.

If i move to third page, the all entered text field text will appear in any view. If i switching the pages, the enter data will be retain in textfield.

how can i do it?

https://forum.qt.io/topic/72890/textinput-value-retain-in-qml

continuation of other thread topic,

You can use one property in Second.qml

property alias adminInfo: text.text

Rectangle
{

    id:textInfo
    width: 150
    height: 50
    color: "skyblue"
    anchors.top: backButton.bottom
    Text {
        id: text
        font.bold: true
        font.pixelSize: 14
        anchors.centerIn: textInfo
    }
}

And in main.qml

    MouseArea
    {
        anchors.fill: submitButton
        onClicked: {
            secondPage.visible = true
            subWindowObject.visible = false
            secondPage.adminInfo = textInputObject.text
        }
    }

Where u are sending the value from one main.qml file to another Second.qml file.

Hope this works,

Thanks,

Thank you for your comments.

I need to pass the textfield text only from one qml to other. I enter the age, name , DOB entered textfield data in page1 will be displayed in page3.qml. I need to transfer textfield enter data only in one qml to other qml.