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WebAPI/DeviceIndexedDB: Difference between revisions
→Usecases
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*** A chooser UI is showed between the request and returning the list. | *** A chooser UI is showed between the request and returning the list. | ||
** With access control defined in the manifest, an app can request for predefined intents. (in the list of index keys) | ** With access control defined in the manifest, an app can request for predefined intents. (in the list of index keys) | ||
=== Application Chooser === | |||
Following is an example of finding Apps providing DataCloudStorage services with DeviceIndexedDB as the application chooser. | |||
var request = window.deviceIndexedDB.open("[SystemService]"); | |||
request.onsuccess = function () { | |||
var db = request.result; | |||
var tx = db.transaction("Applications"); | |||
var store = tx.objectStore("Applications"); | |||
var chooserByIntent = store.index("chooserByIntent"); | |||
var chooserrequest = chooserByIntent.get("DataCloudStorage"); | |||
chooserrequest.onsuccess = function () { | |||
var app = chooserrequest.result; | |||
talkToDataCloudStorage(app.id); | |||
} | |||
} | |||
The "[SystemService]" database is not necessary a real persistent data storage, it is implemented by the platform (Gecko) to provide the service. The line, chooserByIntent.get("DataCloudStorage"), would launch a application chooser by the platform. It return a list of applications once the user finish his selection. | |||