20 Recipes for Programming PhoneGap: Cross-Platform Mobile by Jamie Munro

By Jamie Munro

Gain hands-on event with the fantastic PhoneGap library, utilizing the sensible recipes during this convenient advisor. With those suggestions, you could let your cellular net apps to have interaction with device-specific good points akin to the accelerometer, GPS, digital camera, and handle e-book. the right way to use your wisdom of HTML, CSS, and JavaScript to construct complete cellular apps for iOS, Android, and a number of other systems with out rewriting apps within the local platform language. each one recipe comprises pattern code you should use on your undertaking instantly, in addition to a dialogue of why the answer works.
* upload performance that’s to be had basically on a definite machine or platform
* Retrieve the device’s present GPS situation and position a marker on a map
* Create and store a brand new touch or edit an present touch within the handle booklet
* Take images with the digicam or decide upon one of many user’s present pictures
* add a dossier from the neighborhood machine to an exterior server
* enable the equipment to checklist audio or video via your app
* permit your program to avoid wasting records in the neighborhood

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The final function, showContacts, is called when a successful list of contacts is received from the first function, onContactsLoad. html file. As a nice addition, the contacts are sorted alphabetically by the Retrieving Contacts in the Address Book | 33 givenName. This is done so that dividers can be added to group the items by the first letter of the contact’s name. See Also “Displaying Table-View Data” on page 28 Creating a New Contact in the Address Book Problem You want to allow your application to create and save a new contact or edit an existing contact in the device’s address book.

Html page needs to be updated to include a button to save the file. This can be added in the header as follows:



When the user clicks the Save button, a new savePhoto function is called that will use the FileTransfer class to upload the photo to a remote server. js file created in “Accessing the Camera and Photo Album” on page 41. code); } The example includes a new global variable, currentPhoto.

Js JavaScript file. This script should now be created inside of your assets/www/ scripts directory. drawImage(ball, 0, 0, 100, 81, x, y, 100, 81); } The preceding JavaScript creates seven global variables. The first three will be used to perform the animation, as they contain references to the canvas, the canvas’ context, and finally the image of the ball. The next four variables will be used inside of the moveBall function to help calculate the movement of the ball. The final variable will contain a reference to the accelerometer watch, which will be cleared if there is an error.

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