Flask Button run Python without refreshing page?

Question

I am just getting started into python and flask (for the raspberry pi). I want a web application that would execute some python code to pan and tilt a camera and display a v

Answer 1

I would split it out into two routes to make it easier to see what you have to do:

LEFT, RIGHT, UP, DOWN, RESET = "left", "right", "up", "down", "reset"
AVAILABLE_COMMANDS = {
    'Left': LEFT,
    'Right': RIGHT,
    'Up': UP,
    'Down': DOWN,
    'Reset': RESET
}

@app.route('/')
def execute():
    return render_template('main.html', commands=AVAILABLE_COMMANDS)

@app.route('/')
def command(cmd=None):
    if cmd == RESET:
       camera_command = "X"
       response = "Resetting ..."
    else:
        camera_command = cmd[0].upper()
        response = "Moving {}".format(cmd.capitalize())

    # ser.write(camera_command)
    return response, 200, {'Content-Type': 'text/plain'}

Then in your template you just need to use some JavaScript to send off the request:

{# in main.html #}
{% for label, command in commands.items() %}
    
        {{ label }}
    
{% endfor %}

{# and then elsewhere #}