Hi,
Indeed, Qt Assistant binaries currently use litehtml as renderer, and that
doesn't support JavaScript. We had other renderers as compile-time switch in
the past though, so it shouldn't be too much work to get something else
working, like Qt WebEngine. Using Qt WebView would use the native renderer if
available, but this would require likely some bigger refactoring, as you can't
render content out of memory with this, AFAIK.
In terms of plans, there are no concrete plans for supporting JavaScript in Qt
Assistant that I'm aware of. For Qt documentation, it seems litehtml is good
enough, and switching to Qt WebEngine would only pay off if we could use it
everywhere, including in Qt Creator. But loading Qt WebEngine for rendering a
small documentation tooltip is again overkill, and negatively affects the
performance of Qt Creator, especially at startup...
Kai
________________________________
From: Interest <interest-boun...@qt-project.org> on behalf of David C.
Partridge <david.partri...@perdrix.co.uk>
Sent: Tuesday, March 11, 2025 9:42
To: interest@qt-project.org <interest@qt-project.org>
Subject: [Interest] Qt Assistant and javascript
I understand that Qt Assistant uses litehtml under the covers and that this
means that it doesn’t support javascript.
This presents me with a bit of a problem because there a quite a few places in
the html code for the help that use javascript like this:
<A
onmouseover="document['STACKRESULT01'].src='../images/Theory/Stack_1.jpg';;document.getElementById('LEGEND01').innerHTML='One
Light Frame';" href="javascript:void(0);">
1 image</A></b><br>
<b>
<A
onmouseover="document['STACKRESULT01'].src='../images/Theory/Stack_2.jpg';document.getElementById('LEGEND01').innerHTML='Stack
of 2 light frames';" href="javascript:void(0);">
2 images</A></b><br>
<b>
<A
onmouseover="document['STACKRESULT01'].src='../images/Theory/Stack_4.jpg';;document.getElementById('LEGEND01').innerHTML='Stack
of 4 light frames';" href="javascript:void(0);">
4 images</A></b><br>
<b>
<A
onmouseover="document['STACKRESULT01'].src='../images/Theory/Stack_16.jpg';;document.getElementById('LEGEND01').innerHTML='Stack
of 16 light frames';" href="javascript:void(0);">
16 images</A></b><br>
<b>
<A
onmouseover="document['STACKRESULT01'].src='../images/Theory/Stack_32.jpg';;document.getElementById('LEGEND01').innerHTML='Stack
of 32 light frames';" href="javascript:void(0);">
32 images</A></b></p>
To select which image to display based on which text the mouse is “over”.
Is there any hope for javascript support in the short term?
Alternatively, is there another way to achieve this function that Qt Assistant
does support?
Is it likely that Qt Assistant might be changed to use QtWebEngine instead
(which I think would provide javascript).
Thanks, David
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