On Friday, June 15, 2018 at 6:35:48 AM UTC-7, Fabio Ceccarani wrote:
>
> Ih all,
>
> my site do do these operation:
>
>
> 1. geolocalize user in view using html5 navigator.geolocation (classic js
> code)
>
>
> 2. past latitude and longitude to controller with:
> ajax('{{=URL("default","mycoords")}}'+'?lat='+position.coords.latitude+'&lon='+position.coords.longitude,[],':eval');
> mycoords() put coordinates in session.lat e session.lon
>
>
> 3. controller calculate (and insert in db) distance from user position and
> address present in db, using geopy and virtual field:
> db.courses.distance = Field.Virtual('distance', lambda row:
> int(geopy.distance.vincenty((lat,lon),(row.courses.lat,row.courses.lng)).km))
>
>
> This is ok, but....only after refresh page with F5. (at first page load
> distance is calculated from 0,0 coordinates)
>
> The problem is that controller code is executed before html (and js) in
> view when session.lat e session.lon are None.
> Second time, after refresh, session.lat and session.lon, are valorized by
> first execution of html/js and all is ok.
>
> There's a way to run js script before controller code? Or ask coordinates
> from controller to browser directly using python? Or...another solution...
> :-(
>
> Thank!
> Fabio
>
>
I'd look at using the LOAD() helper or the ajax() function. With these,
the page will load, the JS will run, and then you'll fetch the distance as
an automatic update. You'll break your controller up so that one function
gives you the page load, and the other function does the calculation.
<URL:http://web2py.com/books/default/chapter/29/12/components-and-plugins#LOAD>
<URL:http://web2py.com/books/default/chapter/29/11/jquery-and-ajax#The-ajax-function>
/dps
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