Yes, I'm sorry, but the <dyn> tag is only for HTML and the DOM. It
would take extra implementation effort to make it compatible with SVG,
and that effort has not yet been made... so it's good that the compiler
is raising a static error!
On 05/01/2018 06:04 PM, Jonas Mellin wrote:
Dear all, I have tried to adapt ListEdit.ur in the tutorial to a small
SVG application that adds circles to the screen as you double click
(the code is at the end). The SVG.urs is found at
https://github.com/karsar/urweb-examples/blob/master/SVGTest/SVG.urs
I get a problem at row 57 “<dyn signal={circleDraw p}/>” and also at
line 22 “show' (pl : plist) : signal xsvg =” where the compiler gets
stuck on “Error in final record unification
Can't unify record constructors”. My hypothesis is that there is some
problem between html and SVG.
An excerpt of the error messages sis:
/home/a/SVGTest5/SVGTest.ur:57:3: (to 58:8) Error in final record
unification
Can't unify record constructors
Have: <UNIF:U571::{Unit}> ++ [Dyn = ()]
Need: [Svg = ()]
===== CODE =====
[...]
<circle cx={show ((fst x')-60)} cy={show ((snd x')-100)} r="10"
stroke="red" fill="blue"/>
[...]
and show' (pl : plist) : signal xsvg =
case pl of
Nil => return <xml/>
| Cons {Point = p, Tail = t } => return <xml>
<dyn signal={circleDraw p}/>
</xml>
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