Feature Request: support Dart from within SVG document

[DartBot]

This issue was originally filed by mikeeberhar...@gmail.com

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I would like to use Dart in a standalone SVG document
by including a script, like...
 <script type="application/dart" xlink:href="myapplication.dart"/>

...and then having my SVG onload= event launch "main()" in my Dart-
code, without the SVG requiring an outer HTML file to work.

I currently use JavaScript from within SVG documents like this for full "applications" that are ONLY an SVG document (i.e., no wrapping HTML) with embedded JavaScript, like this example (runs in Chrome):
http://www.mv4t.com/SVG/SVG_Components_Demo.svg

I would really like to convert my SVG JS code to Dart.

[iposva-google]

Removed Type-Defect label.
Added Type-Enhancement, Area-Dartium, Triaged labels.

[DartBot]

This comment was originally written by antonm@google.com

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Mike,

may you small example which fails for you?

tia and yours,
anton.

[DartBot]

This comment was originally written by mikeeberhar...@gmail.com

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I attached what I hope is a simple example.
Dartium 19.0.1071.0 (Developer Build 127096 Windows) is what I tested this on.

The SVG has an onload=main() that successfully runs code in a JavaScript file (that has been included by <script> tag) fine, but there is no apparent way to get the SVG onload to fire a DART program because Dartium apparently is unaware of how to process any <script> for DART language.

Dartium crashes on script syntax like <script type="application/dart" xlink:href="external-code.dart"/> or "text/dart", for both inline dart code or externally-referenced dart code (using xlink:href) like this.

I did not include a .dart file equivalent to the JS code, as it is irrelevant... Dartium can not find ANY .dart file referred to from within SVG, from what I can tell. A single-line external-code.dart file with "main(){}" would suffice for testing.

I hope this helps clarify.

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Attachments:
SVG-using-external-JS.svg (1.28 KB)
external-code.js (960 Bytes)

[DartBot]

This comment was originally written by antonm@google.com

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Thank you very much, Mike, most appreciated.

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Set owner to antonm@google.com.
Added Accepted label.

[DartBot]

This comment was originally written by antonm@google.com

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Mike,

we decided not to support inline callbacks. So your code should be structured differently. And note as well that already main method is invoked on DOMContentLoaded event, so you do need this onload thing anyway.

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Added NeedsInfo label.

[DartBot]

This comment was originally written by mikeeberh...@gmail.com

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antonm...
I tried to make sense of what you just posted for comment #­5, but cannot.
Did you perhaps forget a word?

  You said: "...so you do need this onload thing anyway"
  Did you really mean "so you do NOT need this onload thing anyway"?

Next, you said "we decided not to support inline callbacks".
OK, fine. But, can I still assume you are going to make Dartium able to recognize and run a script of type dart with an SVG file, as I originally asked?

  e.g., <script type="application/dart" xlink:href="myapplication.dart"/>

If this will be supported, and if Dartium will load that script and run "main()" therein by default as you said, that is fine by me.

[DartBot]

This comment was originally written by antonm@google.com

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Mike, sorry, my wording was far from perfect.

Yes, I meant 'so you do not need this onload thing anyway'. And yes, I am fixing Dartium to support SVG documents. ETA is tomorrow my time (MSK).

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Added Started label.

[DartBot]

This comment was originally written by antonm@google.com

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Mike,

I hope I've fixed at least the immediate problem.

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Added Fixed label.

[DartBot]

This comment was originally written by mikeebe...@gmail.com

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antonm...
Thank you!
Yes, I can now use Dart scripts directly from within an .SVG document when viewing with the latest build of Dartium. My early tests function as expected.

In fact, now that I could use Dart, I rewrote the pseudo-examples from my Comment #­3 (above), and have attached a working Dart equivalent: example SVG referencing an external .dart file, which contains main() that fires on content load... it does some simple mouse-event-interaction with the displayed Rect object. Just in case anyone wanted to see the new native-Dart version in action.

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Attachments:
SVG-using-external-Dart.svg (720 Bytes)
external-code.dart (1011 Bytes)

[DartBot]

This comment was originally written by antonm@google.com

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I am glad to hear it and thanks a lot for very detailed bug report. Please, let us know if you meet any other problems.