CODEWITHSUNDEEP
qtqmlembedded-resourceqtwebkitqt5
villintehaspam
villintehaspam

Reputation: 8744

How to display embedded html in Qt WebView

I am trying to get the Qt WebView to display an html file that is embedded as a Qt resource, but I can't seem to get it to work. I created a new Qt Quick application and added a simple qml file:

import QtQuick 2.0
import QtWebKit 3.0

Rectangle {
    id: content
    width: 800
    height: 600
    color: "black"

    WebView {
        id: webView
        anchors.fill: parent
        url: "qrc:/res/test.html"
    }
}

I then created (using the Designer) a resource file that looks like this:

<RCC>
    <qresource prefix="/res">
        <file>test.html</file>
    </qresource>
</RCC>

and created a simple test.html file (in the same directory as the .qrc file):

<html>
<head><title>Hello</title></head>
<body>
  <h1>Hello World!</h1>
</body>
</html>

The result is just a blank white window. If I use a regular url (http://www.stackoverflow.com) in the qml file as the url it works - the page is displayed. If I use the name of an embedded image (qrc:/qt-project.org/mac/cursors/images/pluscursor.png) that image is displayed.

It looks to me as if the html file is indeed added (it is at least listed when I enumerate the embedded resources), but my understanding of the Qt resource system is limited, so I may very well have misunderstood something fundamental.

Can anyone tell me what I am doing wrong?

Update: I have verified that the behavior is the same if I attempt to tell the web view to load the url from C++ as well. I have also verified that the resource is indeed embedded - I can open and read the resource using a QResource. Also, this does not appear to be specific to Qt5: http://qt-project.org/forums/viewthread/18181 (someone having a similar problem with Qt 4.8).

Upvotes: 5

Views: 21585

Answers (8)

Vi.
Vi.

Reputation: 291

The quickest way to load a resource file is using XMLHttpRequest and loadHtml(). This works in Qt 5.10.1 for mobile platforms.

import QtQuick 2.10
import QtQuick.Controls 2.3
import QtWebView 1.1

Page {
    anchors.fill: parent

    WebView {
        id: webView
        anchors.fill: parent

        Component.onCompleted: {

            var resource = 'qrc:/path/to/your/resource.html';

            var xhr = new XMLHttpRequest;
            xhr.open('GET', resource);
            xhr.onreadystatechange = function() {
                if (xhr.readyState === XMLHttpRequest.DONE) {
                    var response = xhr.responseText;
                    webView.loadHtml(response);
                }
            };
            xhr.send();
        }
    }
}

Upvotes: 1

SourabhKus
SourabhKus

Reputation: 828

You can put below line just after QApplication a(argc, argv);

QtWebView::initialize();

Upvotes: 0

Max Go
Max Go

Reputation: 2102

Embedded resources URLs loading support by web engine is available in latest Qt at least for WebEngineView in QML. I was not able to find official documentation about this, but one official sample loads page from resources:

WebEngineView {

    url: "qrc:/index.html"
...
}

It works for me with Qt 5.8.0 as well.

Upvotes: 0

Libor Tomsik
Libor Tomsik

Reputation: 718

I don't thing it's possible opening resource from qrc directly in WebView (I've tried all url variants). What I'm doing now is copying the file to the local temp directory and then opening.

QString helpHTMLFile = QStandardPaths::writableLocation(QStandardPaths::TempLocation);
helpHTMLFile.append(QDir::separator());
helpHTMLFile.append("software_manual.html");
QFile(helpHTMLFile).remove();
QFile(":/software_manual.html").copy(helpHTMLFile);

QQmlApplicationEngine engine;
engine.rootContext()->setContextProperty("pathToFile", "file:///"+helpHTMLFile);

Then QML looks like:

WebView {
         anchors.fill: parent
         url: pathToFile
}

Upvotes: 2

villintehaspam
villintehaspam

Reputation: 8744

Ok, here's how I ended up solving this. I ended up using a plain widget instead of a qml based interface.

I then had to read the first html page out from the resources manually and provide the base url. After that, subsequent pages and resources that are embedded as resources load fine.

Here's the code in question:

QResource res(":/html/index.html");
ui->webView->setHtml(reinterpret_cast<const char *>(res.data()), QUrl("qrc:/html/"));

where webView is a QWebView. My .qrc file looks like this:

<RCC>
    <qresource prefix="/">
        <file>html/index.html</file>
    </qresource>
</RCC>

This works in Qt 5.5.0.

Upvotes: 1

Elias Fazel
Elias Fazel

Reputation: 1

Just use Path-To-File & If you saved it in project directory, just set name of file url: "/res/test.html"

& if file is in project directory url: "test.html"

Upvotes: -1

S.M.Mousavi
S.M.Mousavi

Reputation: 5226

First , make sure that resource file is compiled correctly on compile folder (a .RCC file or a qrc_<Resource name>.cpp)
Second, make sure your file path is correct (in my case qrc:/images/resource/html/test.html). You can open QRC file and right-click on html file and then click on Copy Resource Path to Clipboard.
Third, Note that some urls needs more time for loading completely.

Finally, I test this scenario and it works very well (Using Qt 5.1.0)

Good luck - S.M.Mousavi

Upvotes: 2

B.G.
B.G.

Reputation: 17

why not just use 

url: "res/test.html"

instead of 

url: "qrc:/res/test.html"

?

Then you would not need to use any resource files

Upvotes: -1

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