QWebEngineView no longer render html files with no .html extension
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Hi,
Last week my company upgraded the Qt version to Qt5.15.1 and now I have several issues with my code.
One of them is that the QWebEngineView::load no longer render the html code set in the file: the html code is displayed instead of its rendering.
After 2 days of investigation I realized that if I add .html at the end of my file name it works!
It was working with any file name with Qt5.9.
Is it a regression or is it a new requirement?Here is a simple example that illustrate this issue:
int main(int argc, char *argv[])
{
QApplication a(argc, argv);QDialog* dialog = new QDialog (nullptr); QVBoxLayout* vertLayout = new QVBoxLayout (dialog); QDialogButtonBox* buttonBox = new QDialogButtonBox (QDialogButtonBox::Close, dialog); QWebEngineSettings::globalSettings ()->setAttribute (QWebEngineSettings::AutoLoadImages, true); QWebEngineSettings::globalSettings ()->setAttribute (QWebEngineSettings::PluginsEnabled, true); QWebEngineSettings::globalSettings ()->setAttribute (QWebEngineSettings::JavascriptEnabled, true); QWebEngineView* web_view_ = new QWebEngineView (dialog); web_view_->setMinimumHeight (500); web_view_->setMinimumWidth (700); vertLayout->addWidget (web_view_); vertLayout->addWidget (buttonBox); dialog->connect (buttonBox, SIGNAL (rejected ()), dialog, SLOT (reject ())); dialog->resize (QSize (1200, 800)); QString file_name = "C:/Users/XXX/AppData/Local/Temp/report.txt"; // if here I use report.html it works!! web_view_->load (QUrl::fromLocalFile (file_name)); dialog->show(); return a.exec();}
and here is the contents of the report.txt file:
<html>
<body><h1>Training Set Construction Summary</h1>
Survey: TEXAS3D@vm -pau-pns-2 <br>
Domain: Time Migrated<br>
<br>
<b>Seismic Attributes : </b><br>
-Amplitude<br>
<br>
Filter out constant value traces : yes<br>
<br>
<b>Extraction Geometry</b><br>
-Top Surface : CHANNELROOF UPGRADE RandD TEXAS3D Picking Interpretation - Offset Above : 0 ms<br>
<br>
-Bottom Surface : CHANNELROOF UPGRADE RandD TEXAS3D Picking Interpretation - Offset Below : 20 ms<br>
<br>
</body>
</html>@Ghis64 You can use https://doc.qt.io/qt-5/qwebengineview.html#setHtml instead of load()
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Hi,
Last week my company upgraded the Qt version to Qt5.15.1 and now I have several issues with my code.
One of them is that the QWebEngineView::load no longer render the html code set in the file: the html code is displayed instead of its rendering.
After 2 days of investigation I realized that if I add .html at the end of my file name it works!
It was working with any file name with Qt5.9.
Is it a regression or is it a new requirement?Here is a simple example that illustrate this issue:
int main(int argc, char *argv[])
{
QApplication a(argc, argv);QDialog* dialog = new QDialog (nullptr); QVBoxLayout* vertLayout = new QVBoxLayout (dialog); QDialogButtonBox* buttonBox = new QDialogButtonBox (QDialogButtonBox::Close, dialog); QWebEngineSettings::globalSettings ()->setAttribute (QWebEngineSettings::AutoLoadImages, true); QWebEngineSettings::globalSettings ()->setAttribute (QWebEngineSettings::PluginsEnabled, true); QWebEngineSettings::globalSettings ()->setAttribute (QWebEngineSettings::JavascriptEnabled, true); QWebEngineView* web_view_ = new QWebEngineView (dialog); web_view_->setMinimumHeight (500); web_view_->setMinimumWidth (700); vertLayout->addWidget (web_view_); vertLayout->addWidget (buttonBox); dialog->connect (buttonBox, SIGNAL (rejected ()), dialog, SLOT (reject ())); dialog->resize (QSize (1200, 800)); QString file_name = "C:/Users/XXX/AppData/Local/Temp/report.txt"; // if here I use report.html it works!! web_view_->load (QUrl::fromLocalFile (file_name)); dialog->show(); return a.exec();}
and here is the contents of the report.txt file:
<html>
<body><h1>Training Set Construction Summary</h1>
Survey: TEXAS3D@vm -pau-pns-2 <br>
Domain: Time Migrated<br>
<br>
<b>Seismic Attributes : </b><br>
-Amplitude<br>
<br>
Filter out constant value traces : yes<br>
<br>
<b>Extraction Geometry</b><br>
-Top Surface : CHANNELROOF UPGRADE RandD TEXAS3D Picking Interpretation - Offset Above : 0 ms<br>
<br>
-Bottom Surface : CHANNELROOF UPGRADE RandD TEXAS3D Picking Interpretation - Offset Below : 20 ms<br>
<br>
</body>
</html>wrote on 18 Nov 2020, 14:55 last edited by@Ghis64 said in QWebEngineView no longer render html files with no .html extension:
One of them is that the QWebEngineView::load no longer render the html code set in the file:
It was working with any file name with Qt4.9.
How was that, given that Qt 4 did not have
QWebEngine...anything? Must have been miraculous.... -
@Ghis64 You can use https://doc.qt.io/qt-5/qwebengineview.html#setHtml instead of load()
wrote on 18 Nov 2020, 14:59 last edited by JonB@jsulm said in QWebEngineView no longer render html files with no .html extension:
@Ghis64 You can use https://doc.qt.io/qt-5/qwebengineview.html#setHtml instead of load()
HI @jsulm. Nonetheless, this does seem to be a "gotcha"! Is it intentional? (Might help if the docs forload()said so?) Does this.htmvs.htmlbehaviour apply to Linux, or is it a Windows-thing only?Whoops, I mis-read OP's situation, explained later on below.
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@Ghis64 You can use https://doc.qt.io/qt-5/qwebengineview.html#setHtml instead of load()
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@jsulm said in QWebEngineView no longer render html files with no .html extension:
@Ghis64 You can use https://doc.qt.io/qt-5/qwebengineview.html#setHtml instead of load()
HI @jsulm. Nonetheless, this does seem to be a "gotcha"! Is it intentional? (Might help if the docs forload()said so?) Does this.htmvs.htmlbehaviour apply to Linux, or is it a Windows-thing only?Whoops, I mis-read OP's situation, explained later on below.
@JonB Sure, it could be documented (and should). I think it simply behaves like any web-broweser: if you enter an URL to a *.txt file the browser will not parse its content, but simply show the text even if it contains valid HTML.
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@jsulm setHtml has a limit of 2 MB and it fails with some of our files that display plots with a lot of data.
@Ghis64 Is there a reason why you name HTML files like text files?
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wrote on 18 Nov 2020, 15:14 last edited by
@jsulm In fact in my application code I don't use the .txt extension (I have done like this only in my example). In the application we had this code :
QTemporaryFile* tf = new QTemporaryFile (dialog);
if (!tf->open ()) {
return 0;
}tf->write (html_text.toLatin1 ()); tf->close (); QString file_name = tf->fileName (); web_view_->load (QUrl::fromLocalFile (file_name));I have replaced it by:
QTemporaryFile* tf_html = new QTemporaryFile ("XXXXXX.html", dialog); if (!tf_html->open ()) { return 0; } tf_html->write (html_text.toLatin1 ()); tf_html->close (); QString file_name_html = tf_html->fileName (); web_view_->load (QUrl::fromLocalFile (file_name_html)); -
@jsulm In fact in my application code I don't use the .txt extension (I have done like this only in my example). In the application we had this code :
QTemporaryFile* tf = new QTemporaryFile (dialog);
if (!tf->open ()) {
return 0;
}tf->write (html_text.toLatin1 ()); tf->close (); QString file_name = tf->fileName (); web_view_->load (QUrl::fromLocalFile (file_name));I have replaced it by:
QTemporaryFile* tf_html = new QTemporaryFile ("XXXXXX.html", dialog); if (!tf_html->open ()) { return 0; } tf_html->write (html_text.toLatin1 ()); tf_html->close (); QString file_name_html = tf_html->fileName (); web_view_->load (QUrl::fromLocalFile (file_name_html));@Ghis64 said in QWebEngineView no longer render html files with no .html extension:
I have replaced it by:
Does it work now?
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@Ghis64 said in QWebEngineView no longer render html files with no .html extension:
I have replaced it by:
Does it work now?
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@JonB Sure, it could be documented (and should). I think it simply behaves like any web-broweser: if you enter an URL to a *.txt file the browser will not parse its content, but simply show the text even if it contains valid HTML.
wrote on 18 Nov 2020, 15:41 last edited by JonB@jsulm said in QWebEngineView no longer render html files with no .html extension:
@JonB Sure, it could be documented (and should). I think it simply behaves like any web-broweser: if you enter an URL to a *.txt file the browser will not parse its content, but simply show the text even if it contains valid HTML.
Sorry, I seem to have quite mis-read what the OP said/meant! I had understood him to be saying he used to use
.htmand now found he needs to use.html. Hence my question about Linux vs Windows. But I now see he says nothing of the kind...@Ghis64
Now that I understand you had always used.txt. Then it's not a documentation/behaviour issue. Browsers should always open.txtfiles as text, only.htmor.htmlshould be opened as HTML.
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