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links for 2006-04-18

ByLuis
|

Steponas Kazakevicius’ Blog: Interruptable file download

ByLuis

Steponas Kazakevicius has written up a new tutorial about file uploading and, more specifically, making an upload tool that can handle interruptions. Have you ever been to a website that offers downloads of stuff? And while you are waiting for the download, there are lots of ads around? Sure you have. I have too. The last day I was downloading stuf …

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links for 2008-01-18

ByLuis

Geolocalización por IP mediante Javascript y JSON

ByLuis

Sencillo script que nos devuelve un JSON con la geolocalización según la IP, usando los datos sacados de iplocationtools.com:

function getLocation(){
script = document.createElement('script')
script.src = 'http://www.nitinh.com/ip_query.php?callback=initialize'
document.body.appendChild(script)
}
function initialize(obj){
document.getElementById('spanLocation').innerHTML = obj['City'] + ', ' + obj['RegionName'] + ', ' + obj['CountryName'];
}

IP Address Geolocation Javascript API : JSON

Vía / korayem

2 Comments

  1. Si no me falla la vista (la verdad la vi por 5 segundos) creo que esa funcion esta basada en la formula de los cosenos esfericos y aunque funciona, el margen de error es bastante elevado (chillar al que hizo el planeta tan deforme 😛 )

    En fin, la mas acertada que consegui es la formula de Vicenty que podeis conseguir aca en JS http://www.movable-type.co.uk/scripts/latlong-vincenty-direct.html (pasarla a php toma 5 minutos) y si quereis conocer mas sobre calculo de distancias os recomiendo este otro vinculo http://www.movable-type.co.uk/scripts/latlong.html

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