This API is available on Firefox OS for internal applications 仅。
close()
方法在
DataStoreCursor
interface makes a request to terminate the cursor.
注意 : The Data Store API is available in Web 工作者 , from Firefox 32 onwards (Firefox OS 2.0; see bug 949325 )。
cursor.close();
Void.
In the following example, we run
DataStore.sync()
to create a
DataStoreCursor
object allowing us to loop through any additions since the code last accessed the data store and update the data display as necessary.
The cursor is passed to the
runNextTask()
function, which calls
DataStoreCursor.next
to start the process of managing the next task — the resulting
DataStoreTask
object is passed to the
manageTask()
function to work out what to do with it.
runNextTask()
is then called repeatedly by
manageTask()
until the cursor has finished working through all the records. If an operation of type
clear
is found,
cursor.close()
is called to close the cursor.
var cursor = stores[0].sync();
runNextTask(cursor);
function runNextTask(cursor) {
cursor.next().then(function(task) {
manageTask(cursor, task);
});
}
function manageTask(cursor, task) {
if (task.operation == 'done') {
// Finished adding contacts!
return;
}
if (task.operation == 'add') {
// Add the contacts that are different to how it was before
displayExisting(task.id, task.data);
}
if (task.operation == 'clear') {
// If one of the changes deletes the entire data store's contents,
// then close the cursor
cursor.close();
}
runNextTask(cursor);
}
| 规范 | 状态 | 注释 |
|---|---|---|
|
Data Store API
The definition of 'close()' in that specification. |
草案 |
The discussion concerning this API's creation happened in various Mozilla mailing lists and other places. A summary of the discussion and further pointers can be found on the Mozilla Wiki . For further feedback and questions, send mail to the dev-webapi mailing list.