Converting object to string

Babalas

What do I need to provide to be able to convert my object to a string in something like console.debug? At the moment, printing out my QObjectList gives me @KeyValue(0x196bdc0),KeyValue(0x18f8d40),KeyValue(0x18f90e0),KeyValue(0x1955d40)@
I'd like to convert that to
@KeyValue(0x196bdc0, Key="A", Value=1),KeyValue(0x18f8d40, Key="B", Value=2),KeyValue(0x18f90e0, Key="C", Value=3),KeyValue(0x1955d40, Key="D", Value=4)@

sierdzio

In QML and C++, I often add ::toString() method to various classes to make them print well and easy. You can probably do the same, although it's hard to be exact without seeing your code.

Babalas

So is that an explicit call?
In my example above I have a QObjectList model of KeyValue classes. Basically just pairs. The output I got was by doing
@console.debug(model)@

I'm guessing to produce something similar I'd have to loop and print item.toString then.

Or to go off on a tangent I'm wondering if the javascript interpreter has some default stringify method that can be overridden similar to Rubys "inspect":http://ruby-doc.org/core-2.1.1/Object.html#method-i-inspect method

sierdzio

I'm no expert on JavaScript, sorry.

Yes, your thinking on .tsoString() is correct.

Xander84

If you need the toString-method only for quick debugging in QML you can use a JS loop to go though the object and print all properties with their values in most cases. or write a special function if you want to print only some properties of course.

It sometimes sucks that JS only prints [Object object] for objects by default :D
here my solution:
@
// register this function once
Object.prototype.print = function() {
for (var p in this) {
var v = this[p]
if (typeof v === "object")
v.print()
else if (typeof v !== "function")
console.log(p, v)
}
}

// instead of console.log(obj) use
obj.print()
@
that will recursively print all properties with their values to the console. That is just a simple JS function, you can modify that to your liking and print what you want. :)

of course you can also write a c++ function and call it from QML if you prefer that.

lack

Best method for me:

console.debug(JSON.stringify(yourObject));

JSON global object is part of ES5(EcmaScript 5), it's in core JS functionality.

Vincent007

Is there an easy way to print QML object by JavaScript?

The following code does not work, and no response after being executed.

@
import QtQuick 2.1
import QtQuick.Controls 1.0

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

menuBar: MenuBar {
    Menu {
        title: qsTr("File")
        MenuItem {
            text: qsTr("Exit")
            onTriggered: Qt.quit();
        }
    }
}

Text {
    id: mytext
    text: qsTr("Hello World")
    anchors.centerIn: parent
}

Component.onCompleted: {
    console.debug(JSON.stringify(mytext))
}

}
@

lack

Happened here too. Probably you should submit a bug report.
Doesn't happen to cpp exported object or js object