Let me try to disentangle the potential parts of your question.
I hope you are not asking about literally writing code in JavaScript. I
will proceed as though you are actually asking about /client-side code/,
but let me know if I misunderstood. (It is a rather nice feature of
Ur/Web that writing Ur/Web programs need not involve JavaScript at all,
anymore than we talk about "transistors" when reading JavaScript code!)
So, then, I conclude that your question is how to add a listener on a
[source], to run arbitrary client-side code whenever the source
changes. You seem to be on a good track there, with the mention of a
dummy node. I would create a <dyn> node that generates only a <script>
node, whose 'code' handler will then be run whenever the source changes,
such that this <dyn> node contributes no content to the page.
On 07/04/2018 04:10 PM, Fabrice Leal wrote:
is it possible to trigger javascript code when calling 'set s ...' ?
as i understand the main usage seems to be regenerating html node
trees; i think i could get away with generating some dummy html node
with the javascript call in onload event, but I'm asking just to make
sure I'm not missing anything.
my goal is, for instance, to update some state on the client side and
trigger a canvas redraw,
since i seem to be unable to call '... <- signal s;' inside a
'transaction page'
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