If you need to prevent the sleeping mode here is a plugin that does this..
Install it:
cordova plugin add https://github.com/EddyVerbruggen/Insomnia-PhoneGap-Plugin.git
or
phonegap plugin add https://github.com/EddyVerbruggen/Insomnia-PhoneGap-Plugin.git
than to use it this is the code; to prevent sleep mode use:
window.plugins.insomnia.keepAwake()
instead to re-allow the sleeping mode again use:
window.plugins.insomnia.allowSleepAgain()
Please refer here to full documentation.....
Bye..