This might be relevant: https://stackoverflow.com/questions/12442864/chrome-webkitgetusermedia
"Though, after following this article, I came across a bug, which does not allow one to load resource from localhost or one's machine on Google Chrome(which might also be the case with you) and which gets resolved once you host your HTML page on the net(try using Dropbox to upload your file publicly for free or get hosting for yourself)." I hope this helps, -- Raul On Sat, Jun 3, 2017 at 8:37 PM, Brian Schott <[email protected]> wrote: > David, > > Yes, that looks good although I don't really think I am dealing with > polyfill (because I don't know what it is). I tried pasting that code > directly into my JHS and could not make it work. > > Also, because you pointed me there, I looked more carefully at the original > link which had commented out some "legacy code". I had not noticed that if > the whole conditional fails it actually tests the first conditional phrase > and attempts to deal with that. That code produces an error I have not been > able to understand in Chrome: > > ev_body_load failed: TypeError: Failed to execute 'webkitGetUserMedia' on > 'Navigator': The callback provided as parameter 3 is not a function. > > > I am also getting an error in FireFox when about "context" being undefined > even though I have the following definition. > > var context = canvas.getContext('2d'); > > I can't decide whether the snapping of a picture (in JHS) should be done as > listener in the way the article suggests, or whether the JHS button defined > in HBS with `'snap'jhb'Snap Photo'` should be given an ev definition like > the following one. So far, it appears that this function definition is the > one triggering the context error I mention above. > > function ev_snap_click(){context.drawImage(video, 0, 0, 640, 480);} > > Thanks for you help, > > On Sat, Jun 3, 2017 at 5:57 PM, David Mitchell <[email protected]> > wrote: > >> This looked interesting to me: >> >> https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia >> >> Using the new API in older browsers >> >> Here's an example of using navigator.mediaDevices.getUserMedia(), with a >> polyfill to cope with older browsers. Note that this polyfill does not >> correct for legacy differences in constraints syntax, which means >> constraints won't work well across browsers. It is recommended to use the >> adapter.js polyfill instead, which does handle constraints. >> >> >>> > > -- > (B=) <-----my sig > Brian Schott > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
