Qt WebKit

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  WebKit Status 2017
  • mrjj

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  Feature-wise comparison of QtWebKit reboot with official sources:

  https://github.com/annulen/webkit/wiki/Comparison-with-QtWebKit-5.6

  Note that we are very close to feature parity now, i.e. there are very little features that work with legacy QtWebKit and are not yet supported with reboot, and their number is constantly lowering.

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  Unsolved QT WebKit, disable HTTP2
  • nlazovic 0

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  Hi @nlazovic-0,

  Using QWebView::load() that takes a QNetworkRequest would be the way to go as you can set whatever headers you want, so you can make the adjustments there. However, I would have thought that the server is at fault here as it is a request, it doesn't have to go to HTTP/2.

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  Unsolved Adjust an SVG image to qlabel
  • jss193

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  You need to provide a bit more context. A minimal compilable example would be best with also a sample svg file that triggers this.

  By the way, which version of Qt are you using ? On what platform ?

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  Unsolved Building modern qtwebkit on Ubuntu 16.04 32 bit
  • Nanodeath

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  You can build 18.04 package from sources https://packages.ubuntu.com/bionic/libqt5webkit5

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  Unsolved qtwebkit-5.212 jquery datepicker problem
  • nedlab

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  I am using Windows 7 32 bit Home Basic, Windows 7 64bit Ultimate.
  There no errors in JS console, except unexpected results

  A bit later I figured out a dependence timezone on my PC:
  If set UTC, or "UTC - 4:00 Santiago", or "UTC+ 4:00 Tbilisi" all work fine.
  But if I set "UTC + 4:00 Baku", "UTC + 2:00 Minsk" or something between "UTC +4 Yerevan" and "UTC-3:30 Newfoundland", widget stop works

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  Unsolved [qwebview-python] lagging when play video
  • Tamnv

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  Use QGraphicsWebView with QOpenGLWidget viewport

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  Unsolved [qtwebkit 5.4.2 - WEC7-x86] Unable to load svg image from file (*.svg)
  qtwebkit svg qt 5.4.2 msvc2008 wec7 • • VinayVerma

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  @Konstantin-Tokarev Hi Konstantin,

  Thanks for your quick reply. In case the SVG support is disabled, would it still be possible to display inline SVG images (the first polygon image above)?

  Also, could you please suggest how to check if SVG support is enabled/disabled, and how to enable in case it is disabled.

  Thanks.

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  Unsolved qtwebkit 5.3.2 - browser doesn't work in first attempt, need to run it again
  qtwebkit qtwebengine qt5.3.2 browser qt5 • • Maneesh

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  Solved Override link QUrl parsing?
  qurl qt 4.8 qwebpage • • define-qt

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  JS handler can be added via evaluateJavaScript, and Qt bridge used to provide actual handling via exported QObject

  I've considered adding API for C++ event hadlers, but that would require some development effort

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  Solved Test browser for Qt WebKit 5.4
  • alevicki

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  How you resolved the issue ? Facing similar problem. Thanking in anticipation!

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  Unsolved How to resize browser and fancy browser example widget window size
  • Maneesh

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  Hi and welcome to devnet,

  What about using the showMaximized method on your main widget ?

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  Unsolved Confused about how style sheet inheritance works
  qt 4.8 qwebview stylesheet css • • define-qt

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  @define-qt
  You can be more specific using the name of object as identifier in style sheet sintaxe

  QLineEdit#ObjectName { border:0; }
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  Unsolved What happened to QtWebView in release 5.11.0?
  qml webview • • PJM4B

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  @PJM4B QWebview even with previous versions of Qt works only with one of either MSVC, Android, iOS kits but not MinGW.

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  This topic is deleted!
  • GCDX

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  Unsolved QtWebKit and windows-1251 encoding
  • popov895

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  It might be that QtWebKit is built without ICU support

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  Solved Qt-webkit - segment fault
  qt 5.6 segfault webkit • • 1412

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  @Konstantin-Tokarev The problem has been solved. I change the float strategy from neon to vfpv3 and everything works well.

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  Solved Linux: build QtWebKit against a specific version of ICU?
  • agarny

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  @Konstantin-Tokarev said in Linux: build QtWebKit against a specific version of ICU?:

  @agarny said in Linux: build QtWebKit against a specific version of ICU?:

  From what I can tell, both libQt5Core.so.5 and libQt5WebKitWidgets.so.5 depend on the following two system libraries, which themselves depend on the system version of ICU

  Oh. QtWebKit binaries are provided for use with official Qt builds, not system libraries

  First, I obviously meant libQt5WebKit.so.5 and not libQt5Core.so.5.

  Second, sure, it's just that when you do an ldd on the QtWebKit binaries, you get told that both the system version of ICU and the version you requested (56.1 in my case) are needed. So, I got a bit confused back then, although I now understand the reasoning for it.

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  Unsolved QtWebKit - cannot build qtwebkit-static for static 4.8.x or 5.5.1
  • AZimmerer

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  There was symbol clash with QtScript, but it is not used by QtWebKit since a long time. A few people succeeded in making static builds on Windows, however getting linking right is not trivial

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  Unsolved QWebView crashes when charging google maps
  • davidesalvetti

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  @Konstantin-Tokarev I tried both, debug and release mode, nothing changed a part from the fact that in release it's faster to crash.

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  Unsolved Using both QtWebKit and QtWebEngine in one app
  • popov895

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  @Konstantin-Tokarev Here is a simple html sample:

  <html> <head> <title>Test</title> <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet"> </head> <body> <i class="material-icons">face</i> </body> </html>

  You can load it into QWebView and see that the icon is displayed as italic.

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  Unsolved A sample for a web App in QT
  • cjacquel

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  Or you can use qmlweb (https://github.com/qmlweb/qmlweb)

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  Unsolved QTWebview for Android with C++
  • Miguel Lujan

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  hi @Miguel-Lujan
  qt has some good examples that should get you startet

  Qt Quick Widgets Example Qt WebView Examples
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  Unsolved How can I just display one part of web page use by QWebView?
  • Ryan Lee

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  Depending on what you are trying to achieve:

  You can use QWebFrame::setScrollPosition on main frame to set desired scroll position You can render desired rectangle of page with QWebFrame::render and display resulting image in any way you want
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  Solved How do I use QWebSettings from QML (qt 5.6) ?
  • Allstar12345

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  @Konstantin-Tokarev said in How do I use QWebSettings from QML (qt 5.6) ?:

  You are looking for WebView.experimental.preferences

  See also https://rschroll.github.io/beru/2013/08/21/qtwebview.experimental.html

  How did I miss that, thank you very much :)

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  Solved QWebView for running D3 javascript is slow after reloading HTML.
  • CLang

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  The issue seems to be in Qt5.5 - I compiled with 5.3 and the issue is gone.

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  Solved PyQt get a link's "src" attribute when it is clicked on in a QtWebView
  • jspeirs

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  Ah cool, got it. Ended up going with something like this. Thanks

  webview = WebBrowserView() webview.setWindowTitle(title) webpage = webview.page() webpage.setNetworkAccessManager(self.WebNetworkAccessManager) webpage.setLinkDelegationPolicy(QtWebKitWidgets.QWebPage.DelegateExternalLinks) webview.load(QUrl(url)) class WebBrowserView(QtWebKitWidgets.QWebView): def __init__(self, parent=None): super(WebBrowserView, self).__init__() self.linkClicked.connect(self.handleLinkClicked) def handleLinkClicked(self, url): print(url.toString())
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  Solved Minimal build QtWebKit - inspector not working
  • johnnys

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  @Konstantin-Tokarev with -DUSE_MEDIA_FOUNDATION=OFF build is ok and Inspector working now. Thanks.

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  Unsolved QtWebKit crash built from https://github.com/annulen/webkit.git
  • Robert Chu

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  For the same QtWebkit 5.212 branch, but cloned from http://code.qt.io/cgit/qt/qtwebkit.git/ and building with the MSVC 2017 (x64) toolchain (and against a static qt-5.10.1 build which also used -static-runtime), I am getting an even more serious error:

  All the .exe files which the build-webkit perl script had itself produced inside WebKitBuilt\Release\bin64 are simply crashing / segfault-ing right at startup, with a 0xc0000005 access violation. This includes QtTestBrowser.exe itself. Only the javascript interpreter console utility seems to start and work fine. The same thing happens with any simple Qt test app that links against "CONFIG += webkitwidgets" and just attempting to instantiate a QWebView (just the constructor, nothing else like load() etc).

  Any idea as to why I'm experiencing that?

  My build-qtweb script args are "--no-location", "--no-xslt", "--only-webkit" and some explicit include and lib paths specified via the "--cmake-args", for: sqlite, libjpeg, libpng, libxml and an include for ICU.
  Oh, and in order for the build to work against libs that were built using "static runtime mode" (/MT flag) - including the qt-5.10.1 itself (which was built with "-static" and "-static-runtime"), I had to manually flip a USE_STATIC_RUNTIME local var in Qt5ConfigOptions.cmake from OFF to ON. Otherwise, the nmake would report thousands of errors like mismatch between "MT_static" and "MD_dynamic" mode - mostly when linking against qt 5 code.

  With the same qtwebkit code base but using Alexpux' MSYS2 mingw64 toolchain (based on gcc / g++ 7.3.0), the resulting QtTestBrowser.exe was at least able to start and show some standard info dialog like " "Application failed to start because platform plugin “windows” is missing in path ''".

  The positive aspect with the MSVC 2017 toolchain was that my little Qt test app was able to link right-on with the resulting qtwebkit static .lib files (the mingw64 is having some hiccups which I hope to fix in the meantime - very probably caused by some import libs inter-mixed with true static libs in the toolchain's standard prefix dir).

  I'll add these status updates for the MSVC 2017 toolchain here:
  https://forum.qt.io/topic/88530/linker-error-while-building-qtwebkit-statically-against-working-qt-5-10-1-static-build-on-windows/3

  Would you think that my segfault is caused by "static vc/windows runtime" mode (/MT) enabled in almost all third-party open-source libs (icu, libz, libpng, libxml, sqlite, libjpeg)? Haven't touched openssl (which is 1.0.2n and qt 5.10.1 is instructed to statically link against it). The build-webkit perl script and nmake building went very smoothly - barely saw some warnings like /nodefaultlib:msvcrt or microsoft linker switching to a different mode due to seeing /LRTG or something.

  Or is my crash happening due to those opensrc libs not being built ok? But how come qt5 itself - which is instructed to use ssl and icu (but not the rest), can work just fine?

  Or maybe the QtTestBrowser.exe or any qt test app that wants to use webkitwidgets needs some other config files or env vars present (fonts??)

  Or maybe the CMAKE_PREFIX_PATH define that I am putting in --cmakeargs (path_to_qt5_static_install_BASE_dir not the inner qtbase/ subdir) is wrong? But the QtTestBrowser.exe is considered autonomous, right? Like at that point in time when it gets built, no dependency on qt5 source tree or libs is required, right? Because the qt5 is the one receiving new libs, headers, .pri and .pc files once the qtwbekit got built 100% and "make install" was invoked".

  Thanks and I hope I haven't hijacked this thread. Somehow I feel we are both onto something here.

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  Unsolved Linker error while building qtwebkit statically against working qt 5.10.1 static build on windows
  • smihaila

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  Some status updates:

  I've got the qtwebkit to build ok, using these options:

  perl Tools\Scripts\build-webkit \ --qt \ --release \ --cmakeargs="-Wno-dev -DCMAKE_PREFIX_PATH=path_to_qt5_static_install_dir -G\"MinGW Makefiles\" -DENABLE_API_TESTS=OFF -DENABLE_TEST_SUPPORT=OFF" \ --makeargs="-j8" \ --install \ --prefix=path_to_qt5_static_install_dir

  (note the ENABLE_API_TESTS=OFF and ENABLE_TEST_SUPPORT=OFF defines (which seem to be effective in turning off some internal unit testing apps), plus the "--install" option.
  The most important static .a libs that got built are: libJavaScriptCore, libWebCore, libWTF, libwoff2, libbrotli, libQt5WebKit and libQt5WebKitWidgets.

  The install part of the build also seemed to follow the standard Qt "protocol" i.e. header, libs and .pri files landing in the right place.
  The not-so-great news are:

  The QtTestBrowser.exe app shows a message box like "Application failed to start because platform plugin “windows” is missing in path ''", even after copying sibling with it a "platform" dir with qt5 dll plugins etc. And then terminates. Considering the issues depicted in the points below, it is understandable why.

  The mingw64 7.3.0 toolchain or qtwebkit build / cmake scripts themselves are doing something odd at linker time: what I have discovered was that the .a static files seemed to be "shallow", in the sense that instead of containing the actual .o / .obj object files, they contained only path strings / references to the actual .o files! Somehow the qt or qtwebkit cmake stuff, or the binutils (ar) part of the toolchain are performing in a very bizarre way. I have to re-assemble all the object files myself with the ar utility (3,000+ files) to finally see the static libs usable in my little test app.

  My test app compiles ok, but fails to link - missing symbols are being reported in basic system libs brought by the toolchain itself (i.e. libws2_32.a, libshell32.a, libicu*.a, libxml2.a, libxslt.a, etc). Which is very strange because the libs are really there and are truly static i.e. I do see the allegedly missing symbols there. Because I saw __imp_xyz prefixes reported in those missing names.

  I suspect that some mix-up occurs between static and import libs - very probably due to some of the libs brought by the qtwebkit itself inside "<qtwebkit_src_dir>\WebKitLibraries\win". Although those end up in .lib and not having the "lib" prefix in their name, so very probably they are msvc-based. And the qtwebkit's configure reported the dependent libs as coming from somewhere else i.e. the toolchain.

  Very strange.
  Today I'll redo all these steps with msvc - even if it fails at least it may give me more insights as to what happens under the hood with qtwebkit build script. And even if that doesn't work, it helps clear my mind a little and make me ready to tackle using an older gcc toolchain or do other patching in qt5 itself.

  Thank you.

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  Solved PyQt share session between two QWebView widgets
  • jspeirs

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  @Konstantin-Tokarev thanks, you helped me simplify my approach.

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  Unsolved QtWebKit don't Build
  build qtwebkit windows icu62 • • Soreth

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  Could you show full output of cmake? Did you install libsqlite3-dev package and cmake reports that sqlite is not found? That does not make any sense

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  Unsolved Is there a clear way to parse HTML in Qt 5.7
  html parser c++ windows linux • • lmofallis

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  @cochise said in Is there a clear way to parse HTML in Qt 5.7:

  https://github.com/cutelyst/html-qt

  This is a bit of an old thread but as @cochise said html-qt is an HTML parser, sadly I didn't finish it yet but it follows WHATWG specification on how to implement an HTML parser as HTML is not XML. It's mostly complete but outputting a DOM tree isn't ready yet, so help is welcome.

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  Unsolved Alternative to click on this QWebElement?
  • Bob Asm2

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  @JonB What happens with that page is it seems a "hack" HTML it's of type text but on GUI appers to be a select and when you click on it it show a list of options, in form of autocompleter. I just want to click on it and display that autcompleter.

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  Unsolved Access QWebKit (QML based 5.2+ alpha) from C++
  • scotryder

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  What's wrong with accessing webview in the same way as in example above, i.e. property of a root object?

  In my recent project I use a different approach, my QML scene is really minimalistic (WebView and splash screen only), so I construct it fully in C++

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  Solved Keyboard not working in QWebView
  • jspeirs

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  Good suggestion. Yes, it worked in the examples. I found the issue, there was a layer of code above my app that was restricting keyboard events. I was able to disable that and get it to work.

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  Unsolved How to determine whether a select's child element is visible on browser's screen area?
  • Bob Asm

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  In QtWebKit 5.212 you obtain focused QWebElement by tracking focusedElementChanged signal on QWebPage. We should probably add getter to make it full-fledged property.

  Note that not everything that you can select on page is element, and geometry of text selection is not available in public API at the moment

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  Solved How do I make my own custom QNetworkReply?
  • Bob Asm

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  Super :)
  It was a long shot but sometimes one is lucky :)

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  Solved Inherit from web page result into run time error.
  • Bob Asm

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  @Pablo-J.-Rogina I'm sorry, I new to this forum. Done. Thank you.

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  This topic is deleted!
  • Bob Asm

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  Unsolved How can I get the widget from a QWebElement?
  • Bob Asm

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  You may want to use this instead: https://github.com/cisco-open-source/qtwebdriver