This is a text-only version of the following page on https://raymii.org: --- Title : Log all Item properties and functions in Qml Author : Remy van Elst Date : 09-02-2022 URL : https://raymii.org/s/snippets/Log_all_Item_properties_and_functions_in_Qml.html Format : Markdown/HTML --- This small snippet of Javascript logs all properties and functions of a Qml Item. This is useful when you're knees-deep in a dynamic control that has a model and you're wondering why your code does not work. Probably because you're not using the correct property name. Or at least, that is something I often have. Logging all properties or functions helps to figure out that issue.

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![demo program][1] > A demo program that logs functions and properties to the command line and a `TextArea` The code to log all properties is actually very simple: function listProperties(item) { var properties = "" for (var p in item) if (typeof item[p] != "function") properties += (p + ": " + item[p] + "\n") return properties } Same goes for logging all functions: function listFunctions(item) { var functions = "" for (var f in item) if (typeof item[f] == "function") functions += (f + ": " + item[f] + "\n") return functions } If you remove the `if(typeof...` then you get both in the output. Usage is simple, just pass the `id:` of an item you want to log: Button { id: logButton [...] text: "Log Properties" onClicked: { console.log(listProperties(logButton)) } } You could also use `JSON.stringify()` but I have seen recursive loops that crashed when using that, so this is my small goto snippet. ### Demo Qml Program Here's a small Qml demo program that logs either functions or properties to the command line and a `TextArea`. **main.qml** import QtQuick 2.15 import QtQuick.Controls 2.12 import QtQuick.Window 2.15 Window { width: 640 height: 480 visible: true title: qsTr("Log Properties Example") function listProperties(item) { var properties = "" for (var p in item) if (typeof item[p] != "function") properties += (p + ": " + item[p] + "\n") return properties } function listFunctions(item) { var functions = "" for (var f in item) if (typeof item[f] == "function") functions += (f + ": " + item[f] + "\n") return functions } Button { id: logButton anchors.top: parent.top anchors.left: parent.left anchors.margins: 50 objectName: "Raymii.org Example" text: "Log Properties" onClicked: { console.log(listProperties(logButton)) logTextarea.text = listProperties(logButton) } } Button { id: logFunctionsButton anchors.top: parent.top anchors.left: logButton.right anchors.margins: 50 text: "Log Functions" onClicked: { console.log(listFunctions(logFunctionsButton)) logTextarea.text = listFunctions(logFunctionsButton) } } ScrollView { id: propertyview anchors.top: logButton.bottom anchors.left: parent.left anchors.margins: 50 width: 500 height: 300 TextArea { id: logTextarea anchors.fill: parent placeholderText: "click the buttons" } } } **main.cpp** #include #include int main(int argc, char *argv[]) { #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling); #endif QGuiApplication app(argc, argv); QQmlApplicationEngine engine; const QUrl url(QStringLiteral("qrc:/main.qml")); QObject::connect(&engine, &QQmlApplicationEngine::objectCreated, &app, [url](QObject *obj, const QUrl &objUrl) { if (!obj && url == objUrl) QCoreApplication::exit(-1); }, Qt::QueuedConnection); engine.load(url); return app.exec(); } [1]: /s/inc/img/qml_log_properties.png --- License: All the text on this website is free as in freedom unless stated otherwise. This means you can use it in any way you want, you can copy it, change it the way you like and republish it, as long as you release the (modified) content under the same license to give others the same freedoms you've got and place my name and a link to this site with the article as source. This site uses Google Analytics for statistics and Google Adwords for advertisements. You are tracked and Google knows everything about you. Use an adblocker like ublock-origin if you don't want it. All the code on this website is licensed under the GNU GPL v3 license unless already licensed under a license which does not allows this form of licensing or if another license is stated on that page / in that software: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Just to be clear, the information on this website is for meant for educational purposes and you use it at your own risk. I do not take responsibility if you screw something up. Use common sense, do not 'rm -rf /' as root for example. If you have any questions then do not hesitate to contact me. See https://raymii.org/s/static/About.html for details.