Re: executing while loop and simultaneously redirecting to new page on form submission

Do it the other way around:
 start the LED code in a thread and do the redirect in the main code.

Am Donnerstag, 13. Oktober 2016 16:07:03 UTC+2 schrieb Peter Tsapatsaris:
>
> Thanks for the reply Björn - I am attempting to start a new thread in 
> python that redirects to the webpage, but no luck so far.
>
> def index(self):
>
> return open('index.html')
>
> index.exposed = True
>
> def ledDisplay(self, message):
>
> if message:
>
> def newFunc():
>
> raise cherrypy.HTTPRedirect("thanks.html")
>
> thread.start_new_thread(newFunc, ()) 
>
> while True:
>
>                                //Execute LED code on loop.
>
> The LED code gets executed, but the redirect doesn't happen.  I can get 
> other code within newFunc to run (like a print statement), but I can't get 
> it to redirect.  The server throws an unhandled exception error.
>
> Any additional advice would be greatly appreciated!
>
> On Thursday, October 13, 2016 at 3:24:27 AM UTC-4, Björn Pedersen wrote:
>>
>> Hi,
>>
>> this is a typical use case for multi-threaded programming. 
>>
>> Your web interface just  sets a variable (protected by a mutex), and a 
>> background  thread does the LED output.
>>
>> Björn
>>
>> Am Donnerstag, 13. Oktober 2016 07:44:03 UTC+2 schrieb Peter Tsapatsaris:
>>>
>>> Hello everyone,
>>>
>>> I've been using cherrypy on a Raspberry Pi to run a web controllable LED 
>>> matrix.  I've run into a bit of a wall.  Short version of question: Is it 
>>> possible to send the user to a new webpage in a function WITHOUT returning 
>>> or breaking?  I am trying to execute code in a block below the redirect. 
>>>
>>> Long version:
>>>
>>> The LED control code executes on a while loop after receiving input from 
>>> an an HTML form like the following:
>>>
>>>     <form name="myform" class="rounded" action="ledDisplay" method="GET" 
>>> onsubmit="archive.html">         
>>>         <input type="text" class="box" name="message" maxlength="1000" 
>>> placeholder="enter your message" />
>>>         <input type="submit">
>>>     </form>
>>>
>>> The ledDisplay function executes the while loop with the message from 
>>> the form.  My problem is this--after submission, I would like to redirect 
>>> the user to a new webpage (e..g, "thanks.html").  However, when I redirect 
>>> it either executes BEFORE the while loop, thus preventing the LED from 
>>> running, or executes AFTER the while loop, i.e., never.  
>>>
>>> Does anyone know if there is a way to get CherryPy to send the user to a 
>>> new webpage and then continue to execute a code block?  Here is a skeleton 
>>> of the code I'm working with:
>>>
>>> class myApp:
>>>
>>> def index(self):
>>>
>>> return open('index.html')
>>>
>>> index.exposed = True
>>>
>>> def ledDisplay(self, message):
>>>
>>>
>>> if message:
>>>
>>> raise cherrypy.HTTPRedirect("thanks.html") /* This prevents the loop 
>>> from executing.  Any way to open the page and still execute the loop*/
>>>
>>>  
>>>
>>> while True:
>>>
>>>                                //Execute LED code on loop.
>>> Apologies if I'm being obtuse - I am new to programming. 
>>>
>>

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