i have tested the music demo on iphone 4g and 3gs running iOS 4 and i saw a difference! back button bg and borders doesn t show on 4g where only borders show on 3gs iOS4
On 05/07/2010, RobG <[email protected]> wrote: > > > On Jun 25, 9:56 pm, Stan Wiechers <[email protected]> wrote: >> Hey, >> >> as usual you can't tell from the user-agent which iphone model you are >> dealing with. > > There is no reason to think you can - a browser is an application, the > underlying hardware is irrelevant. There is no specification for what > a UA string should contain, it might be anything. > > >> in the past i used a simple 20ms benchmark in javascript to >> distinguish between 2g/3g and 3gs. the idea was formed in a discussion in >> this very group here. > > Do you have an estimate of the percentage of incorrect results? If a > 3gs is busy doing something else when the test runs (say a call is > incoming or some other task runs in the background), likely it will be > misidentified. Changes to the script engine that affect performance > (e.g. so that older models with the update run as fast as new models > without) will likely make things even more difficult. > > >> var percentmobile_t=new Date().getTime(); >> var percentmobile_s=0; >> while(new Date().getTime()-percentmobile_t<20) > > There is no need to use getTime(), though I doubt it is relevant here. > Subtracting one Date object from another will return the difference in > ms (per ECMA-262): > > >> { >> Math.random(); >> percentmobile_s++;} >> >> var model=(percentmobile_s>1000)?"3gs":"2g3g"; >> >> this worked well and i expected to be able to do something similar for the >> new device. didn't work. within the 20ms both create between 1500-2400 >> random numbers. i tried creating some other objects such as images or DOM >> nodes, but same thing, the browser performance is not distinguishable. >> does >> anyone of you have an idea what else to try? > > Ask the user? > > > [...] >> disclosure: i am co-founder of percentmobile.com, a *free* mobile web >> analytics solution and we used the methods like the one above in the past >> to >> differentiate between models. > > Hopefully you advise clients of the difficulty of reliably detecting > underlying platforms and provide an estimate of accuracy when > reporting data or statistics. > > > -- > Rob > > -- > You received this message because you are subscribed to the Google Groups > "iPhoneWebDev" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/iphonewebdev?hl=en. > > -- Remi Grumeau tel: (0)663 687 206 http://www.remi-grumeau.com -- You received this message because you are subscribed to the Google Groups "iPhoneWebDev" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/iphonewebdev?hl=en.
