Some suggestions here: stackoverflow.com/questions/13376048/how-do-i-programmatically-refresh-a-browser
On Sep 5, 2017 9:19 AM, "Stefano Lanzavecchia" <s...@apl.it> wrote: > A META header in the <Head> section of the HTML page can force a recurrent > refresh. The first article Google found on the subject is this one: > http://www.htmlgoodies.com/tutorials/getting_started/article.php/3479551 > The article also shows a micro-snippet in JavaScript to obtain a similar > effect on a user click. > > In order to obtain a similar effect under program control, where the > server decides when it's time to upgrade, one needs to keep a channel > opened between the browser and the server. This implies tricky JavaScript > code client-side and tricky code server side. Modern browser can leverage > so-called websockets (https://en.wikipedia.org/wiki/WebSocket) as long > as the server is up to the game. There are fallback strategies ( > https://stackoverflow.com/questions/7807066/how-signalr- > works-internally/7874352#7874352). In general, having a full-duplex > communication between a browser and a web server is possible but it's not > trivial and its complexity depends, among various other things, on the > level of compatibility required. Personally, before embarking in anything > more complex, I would try and see if the Meta Refresh tag is good enough. > > Good luck! > -- > Stefano > > -----Original Message----- > From: Programming [mailto:programming-boun...@forums.jsoftware.com] On > Behalf Of Raul Miller > Sent: martedì 5 settembre 2017 14:54 > To: Programming forum <programm...@jsoftware.com> > Subject: Re: [Jprogramming] How can I auto-refresh a JHS app page? > > That's pretty much it. The browser is in control here, and jijx is only > indirectly in control as a result. > > Probably the simplest would be to put something like Refresh: 3 in the > http headers in your MYTEMPLATE (before the first blank line). But I > haven't tested that - I probably need to upgrade my jhs implementation > before your code would work for me. > > Thanks, > > -- > Raul > > > On Tue, Sep 5, 2017 at 8:27 AM, Ian Clark <earthspo...@gmail.com> wrote: > > Currently I'm hacking it by using Keyboard Maestro to execute a timer > which > > reloads the message URL every 3 seconds. > > > > I guess much the same thing could be done using Javascript embedded in > > message.ijs? – if I knew any Javascript. > > > > Another expedient is to write out the message display to a textfile > > (~/message.txt) and open it using TextWrangler. This (unlike TextEdit) > > refreshes its display window whenever message.txt is rewritten. > > > > But these expedients are inelegant. I guess web browsers were not > designed > > to do this sort of thing. (Or designed not to do this sort of thing?) > > > > On Tue, Sep 5, 2017 at 2:59 AM, Ian Clark <earthspo...@gmail.com> wrote: > > > >> Suppose I am a JHS coder, working with the J session (the jijx page), > and > >> have written an app called "message" (say). This generates a page of > data > >> in response to the URL: > >> > >> http://localhost:65001/message > >> > >> which I choose to display in a separate browser window. Let's call it > the > >> message window. > >> > >> If I execute some phrase in jijx which changes the content of the > message > >> window, then in the normal course of things I would need to manually > reload > >> the page in order to see the altered data. For example (in Safari) by > >> activating the message window and clicking the symbol: "Reload this > page". > >> > >> How can I write a verb (to be executed in jijx) which refreshes the > >> message window without having to do that? > >> > >> > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
