Using the Data Store API - Archive of obsolete content | MDN

 

firefox os app store

The per-OS app store model has resulted in a market where a small number of OS companies have a large amount of control, limiting choice for users and app developers. Exploding apps out into multiple sheets could really differentiate the Firefox OS user experience from all other mobile app platforms which are limited to one window per app. Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more. The app store for Firefox OS shuts down on March 30th. 03/27/ at PM by Brad Linder 3 Comments. It’s been about two years since Mozilla pulled the plug on Firefox OS.


The app store for Firefox OS shuts down on March 30th - Liliputing


Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps. It is designed to work alongside other client-side storage mechanisms to provide data that can be read and written to by multiple apps.

In this article we'll cover the basics of how to use this API to build up some examples. To explain the main functionality of Data Store, we have build two examples that work together you can download these from Github using the code below, and experiment with them as you wish :.

Contacts Editor : This app populates a data store called 'contacts' with some sample data, and also allows you to enter new contacts as you wish. You can also delete contacts. Contacts Viewer : This app reads the same 'contacts' data store, but does not change the data in any way, firefox os app store. It shows the available contacts in firefox os app store list, and also plots their location on a Google map. Both firefox os app store are very similar in terms of their manifest.

What is more interesting is that each one contains a type field to specify that this app is certified and should be treated like so:. In addition, we've specified the following field to lock the apps' orientation into landscape, as things like lists and tables look bad on firefox os app store narrow screen sizes:.

Where things differ firefox os app store the two apps is the datastore permissions. The Contacts Editor owns the data store, so uses the datastores-owned field to declare this:.

In actual fact, this is all you need to do to create the contacts data store: with this permission specified, the store is created when the device is booted up with the app present on it. Now on to the Contacts Viewer app — this is not the firefox os app store store owner, so it instead uses the datastores-access field:. Note how in this case the access is set to readonly, firefox os app store, although this app could request readwrite if it wanted to.

However, if the owner of the datastore had readonly access, this app would only have a maximum of readonly, even if it specified readwrite. This means you need to include the following type field in such apps:. You need to also include the datastores-access field so that your 3rd party homescreen can access the same datastores as the default homescreen see the homescreen source code :. As we firefox os app store earlier, the contacts data store has already been created by the inclusion of the datastores-owned field in the manifest.

The data store is only created when the app is booted up with the app present on it, so this is how you emulate that. To access the data store in the first place, firefox os app store, you need to use the navigator. The promise resolves with an array of all the data stores on the device that have the name provided as the method's argument, in this case contacts.

Since there is usually only one datastore with each name, you can access this specific data store inside the promise with contacts[0]. This is a DataStore object that can be used to manipulate the Data Store we want to work with. The next thing we do is to use the Firefox os app store. This promise resolves with a double indicating the number of records in the data store.

We use this to check whether the data store has no records in it. If so, we loop through an array of default records called contactsInit and add each one to the data store using the addContact function. If the store has got some records in it already we don't firefox os app store to initialize the data store like this, and instead create a cursor using the DataStore. In the addContact function, we use the DataStore. This method also returns a promise, which resolves with the id of the newly added record.

When this occurs we create a table row, populate it with that record's data, and add it to the data table in the app's UI so we can see the change visually too. The last thing we do here is add the id of the current record to the table row inside a data-id attribute, and attach an onclick handler to the table row so that when a row is tapped in the UI the deleteItem function is invoked, which handles deleting both the row from the UI, and the corresponding record from the data store.

To sync the data an app has access to when the data store is changed, you generally use the DataStore. Data Store also has the DataStore. We'll see that in action later, when we look at the Contacts Viewer app, firefox os app store.

In this case, we only want to fire the sync operation whenever the app starts up and the data store isn't empty, in which case we just want to go firefox os app store each item added to the store and display them in our contacts table.

Earlier on, we invoked the runNextTask function and passed it the cursor. To deal with the first task, firefox os app store, we run the DataStoreCursor. We then invoke the manageTask function, passing it the current task and the cursor. This runs through each task in the cursor, checking each one and then running the next task by recursively calling runNextTask again.

If the DataStoreTask. If the task type is addwe run the displayExisting function, passing it the DataStoreTask. We don't care about other task types for this particular app. If you look at the displayExisting function in the code, you'll notice that it is very similar to the addContact function we discussed earlier, except that in this case we don't have to access the data store — we've already got the data we want to display from the task item.

Note : The DataStore. If you want to sync all changes from a certain point in the data store history, pass it the revisionId from that point. If you don't pass it a revisionIdit just syncs all changes from the very beginning of the data store's history. When a user submits the form, firefox os app store, the addUserData function is run to add the contact data to the data store and display it in the table. After a bit of very basic! The only function we've not discussed so far from Contacts Editor is deleteIteminvoked when a row is clicked on.

This quite simply:. We're not going to go through every part of the Contacts Viewer application, because a lot of the code is very similar to what we've already seen. One part that is different is that when the app is first initialized, we not only run the syncing mechanism just like we did in Contact Editorbut we also include that same code again, wrapped in a DataStore. This is so that, if the Contacts Editor app makes a change to the contacts data store, we can sync the display in this app, firefox os app store.

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firefox os app store

 

The app store for Firefox OS shuts down on March 30th. 03/27/ at PM by Brad Linder 3 Comments. It’s been about two years since Mozilla pulled the plug on Firefox OS. Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more. Portions of this content are ©– by individual dollly.ga contributors. Content available under a Creative Commons license.