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

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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