Unsolved JS in QML has incomplete support for XMLHttpRequest

[Bosh]

I want to download file using XMLHttpRequest in QML and want to konw the progress. The
code show as below

function request_load(url) {
        let xhr = new XMLHttpRequest();
        xhr.onprogress = function () {
            console.log("LOADING", xhr.status);
        };
        xhr.open("GET", url, true);
        xhr.onreadystatechange = function () {
            if (xhr.readyState === XMLHttpRequest.HEADERS_RECEIVED) {
                console.log("HEADERS_RECEIVED");
            } else if (xhr.readyState === XMLHttpRequest.DONE) {
                console.log("DONE");

            }
        };
        xhr.send();
    }

But xhr.onprogress event do nothing.
I try it on Chrome Console. It's right

[J.Hilk]

@Bosh QML supports ECMA-262 7th edition standard

You'll have to check if what you're trying to do is a feature from a newer standard!
https://doc.qt.io/qt-5/qtqml-javascript-hostenvironment.html

[Bosh]

In this page, doc show the XMLHttpRequest
https://doc.qt.io/qt-5/qtqml-javascript-qmlglobalobject.html#xmlhttprequest. --- "The XMLHttpRequest API implements the same W3C standard as many popular web browsers "

In w3c, this page show the onprogress event.

[J.Hilk]

@Bosh literally the next sentence:

Additionally, the responseXML XML DOM tree currently supported by QML is a reduced subset of the DOM Level 3 Core API supported in a web browser.

[Bosh]

@J-Hilk
Thanks！

Maybe for this reason as above, but the QML compiler does not report an error or wanning。

[fcarney]

@Bosh Submit a bug/feature report: https://bugreports.qt.io I looked at the source code and I don't see the term progress in any of the files I looked at. My guess is it has not been implemented yet.

As for no error/warning is my guess it just looks like you set a property on an object. There would be no warning/error for an unused value.

Also note that while QML strives to create a nice environment for scripting UI elements it does not strive for browser compliance. QML is not a browser. So QML supports what their devs choose to support.

[Markus Goetz53]

Might be this existing bug: https://bugreports.qt.io/browse/QTBUG-67337?jql=text ~ "xmlhttprequest progress"

Indeed nothing in code: https://code.woboq.org/qt5/qtdeclarative/src/qml/qml/qqmlxmlhttprequest.cpp.html