How to pass string value to loader iem?

  • I have a child.qml which will be loaded by a Loader.
    child.qml has a Text
    I want to pass a string to Text Dynamically.
    How to do it?
    Thanks for your guidance!

  • I define a property string origName in parent Loader,
    child.qml uses parent.origName to reference it.
    When I changed the source property of Loader, I got "TypeError: Cannot read property 'origName' of null"
    Is this a serious problem?

  • Hi, would you please show the code?

  • @Mr-Pang

    Below the methods typically used:

    yourLoader.setSource("child.qml", {"text": "yourMessages"}); // "text" is property name on child.qml item

  • @Devopia53
    Thank you very much.
    I am too careless to find out this method.

  • I think it would have help to have a complete working code as there many ways to use a loader and passing a string...

    Here is a sample with 4 ways :

    import QtQuick 2.2
    import QtQuick.Window 2.1
    import QtQuick.Controls 1.2
    import QtQml 2.2
        visible:true;    width:640;    height:480
            property string origName : "orig"
   : button.bottom
            onClicked: {
                var curTime = new Date().toTimeString();
                yourLoader.setSource("child.qml", {"text": "text:"+curTime});
                yourLoader.item.text2 = "text2:"+curTime;
                yourLoader.origName = "text3 and text4:"+curTime;

    and child.qml

    import QtQuick 2.0
    Item {
        id: root
        property string text : "init 1"
        property string text2 : "init 2"
        property string text3 : yourLoader.origName
        property string text4 : parent ? parent.origName : ""
            text : parent.text + "\n" + parent.text2 + "\n" + parent.text3 + "\n" + parent.text4

    as you can see the 3 first ways are working fine without error whereas the 4th requires to check the validity of parent before accessing its property.

Log in to reply

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.