Wt

Require does what it says, it requires that JavaScript to be loaded, the idea being that any JavaScript you execute after that could depend on it. For non-essential JavaScript, we don't currently have something ready-made for that. We either just insert the <script> tag using a WText with TextFormat::UnsafeXHTML, or using doJavaScript(), usually for Google Analytics or stuff like that. Usually those actually provide the piece of JavaScript you need to execute. Maybe it's an idea to add something to maybe load, but not require, some JavaScript, but there's no standard way for it at the moment.

Hi Roel, thanks for your reply.

So, I want to include Google AdSense on my website and need to include their

script tag somehow within my HTML header:

<script data-ad-client="ca-pub-xxxxxxx" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>

After some more searching in this forum for an unrelated issue, I found the <head-matter> where

All contents will be inserted into the

tag verbatim

Now, having added the script tag, starting the Wt-app immediately ends up in an exception call:

terminate called after throwing an instance of 'Wt::WServer::Exception'

what(): Error reading: /path/to/config/wt_config.xml: expected =

After a little playing around, removing async made the Wt-app start, though the browser shows a blank page and the wt session dies after a timeout:

[2020-Mar-16 09:42:29.404] 4682 - [info] "Wt: session created (#sessions = 1)"

[2020-Mar-16 09:42:29.404] 4682 [/web U3R0YkDOH4tqMZ7i] [info] "WEnvironment: UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36"

127.0.0.1 - - [2020-Mar-16 09:42:29.406] "GET /web/ HTTP/1.1" 200 2416

[2020-Mar-16 09:42:29.406] 4682 - [info] "WebRequest: took 2.085 ms"

127.0.0.1 - - [2020-Mar-16 09:42:31.436] "GET /web?wtd=U3R0YkDOH4tqMZ7i&request=style&page=1 HTTP/1.1" 200 0

[2020-Mar-16 09:42:31.436] 4682 - [info] "WebRequest: took 2000.66 ms"

127.0.0.1 - - [2020-Mar-16 09:42:31.462] "GET /icons/fire-32.png HTTP/1.1" 200 691

[2020-Mar-16 09:42:40.510] 4682 [/web U3R0YkDOH4tqMZ7i] [info] "WebController: timeout: expiring"

[2020-Mar-16 09:42:40.510] 4682 [/web U3R0YkDOH4tqMZ7i] [info] "Wt: session destroyed (#sessions = 0)"

So, bottom line: I'd like to insert this <script> tag into my header without breaking the page when the browser has an ad-blocker running...

It seems to me that you didn't supply the -c or --config argument properly. You need to change the path there to the actual path to your wt_config.xml. Right now it's looking for /path/to/config/wt_config.xml, which likely does not exist.

Hi Roel,

I manually changed /path/to/config/wt_config.xml before posting here to not quote my local dev environment verbatim here.

The path is correct, the file can be found and other changes in there are reflected in the app (e.g. favicon, upload file size limits, user agents etc.)

Aha, now I see. The xml file needs to be valid XML. Just "async" on its own may be valid HTML, but it's not valid XML. It should be fine if you change it to async="async".

Oh, I see, thanks for pointing that out (the documentation of the tag said it's all added "verbatim").

Changing it to async="async", I get the same problem as without the async: The page stays blank and the session gets destroyed after the time out.

As a matter of fact, this happens also with a completely empty script tag, both <script /> and <script></script>...

The <link> tags for the favicon in the same <head-matter> work without any issues.

I managed to add the tag using a WText with TextFormat::UnsafeXHTML with the same result that an ad-blocker breaks the whole website...

Funny enough, allowing javascript, reloading and blocking it again shows the webpage... (using uBlock Origin, so that problem might actually be on their side)

Yes, it is indeed added verbatim but it's still an XML file, so it needs to be valid XML. Maybe it works with a CDATA section.

We actually add a <script> tag on the Wt website like this:

    <script type="text/javascript">
        /*<![CDATA[*/
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');

ga('create', 'UA-*******-*', 'auto');
ga('send', 'pageview');
        /* ]]> */
    </script>

With UA-*******-* your tracking id.

We just put that in a WTemplate.