[Qgis-user] Refresh layer at interval

[Aron Gergely]

Hi Robert,

I do not know the answer to your question, but I think you are asking in 
the wrong list.
You may have better success on `qgis-developer` (I added it in, so this 
is getting cross-posted)

On 01/11/2020 21:24, nagyrobi_r at yahoo.com wrote:
>
>     Hi All!
>
>     I am trying to understand the behavior of Layer->Render-> Refresh
>     layer at interval in QGIS
>
>      1. I sat up a flask rest api which serves a geojson.
>      2. I added the geojson to QGIS via Add Layer->
>          1. a. Protocol HTTP/cloud/etc
>          2. b. Type: HTTP
>          3. c.URI: localhost/points.geojson The points are represented
>             on the map correctly
>      3. I changed the layer->Properties->Rendering-> Refresh layer at
>         interval (5 sec)
>
>     I would have expected that there would be a call every 5 seconds
>     towards the server and the map data would be updated accordingly.
>     But the layer does not get refreshed. I don't see any changes
>     neither when I remove a point from the json file on my local
>     drive, nor if I change an attribute. If I press F5 then the canvas
>     refreshes and it automatically loads the new data and I can see
>     the changes. Is this the behavior that is wanted or am I
>     misunderstanding the function of this tool? It seems like the data
>     is cached somewhere?
>
>     |from flask import Flask from flask_restful import Api, Resource
>     import json app = Flask(__name__) api = Api(app) class
>     point(Resource): def get(self): with
>     open('C:/points/venv/src/points.geojson') as json_file: data =
>     json.load(json_file) return data
>     api.add_resource(point,"/points.geojson") if __name__=="__main__":
>     app.run(debug=True)|
>
>     |Robert Nagy|
>
>
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-- 
Email Signature Kind Regards,

Aron Gergely
+31 (0) 6 38 70 97 66

*Rasterra* | www.rasterra.nl <https://www.rasterra.nl>
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