Github user riknoll commented on a diff in the pull request:
https://github.com/apache/cordova-plugin-network-information/pull/40#discussion_r60995346
--- Diff: README.md ---
@@ -210,4 +210,120 @@ When running in the Emulator, the `connection.status`
is always unknown, so this
The Emulator reports the connection type as `Cellular`, which does not
change, so events does _not_ fire.
+## Sample: Upload a File Depending on your Network State
+
+The code examples in this section show examples of changing app behavior
using the online and offline events and your network connection status.
+
+To start with, create a new FileEntry object (data.txt) to use for sample
data. Call this function from the `deviceready` handler.
+
+>*Note* This code example requires the File plugin.
+
+```js
+
+var dataFileEntry;
+
+function createSomeData() {
+
+ window.requestFileSystem(window.TEMPORARY, 5 * 1024 * 1024, function
(fs) {
+
+ console.log('file system open: ' + fs.name);
+ // Creates a new file or returns an existing file.
+ fs.root.getFile("data.txt", { create: true, exclusive: false },
function (fileEntry) {
+
+ dataFileEntry = fileEntry;
+
+ }, onErrorCreateFile);
+
+ }, onErrorLoadFs);
+}
+```
+
+Next, add listeners for the online and offline events in the `deviceready`
handler.
+
+```js
+document.addEventListener("offline", onOffline, false);
+document.addEventListener("online", onOnline, false);
+```
+
+The app's `onOnline` function handles the online event. In the event
handler, check the current network state. In this app, treat any connection
type as good except Connection.NONE. If you have a connection, you try to
upload a file.
+
+```js
+function onOnline() {
+ // Handle the online event
+ var networkState = navigator.connection.type;
+
+ if (networkState !== Connection.NONE) {
+ if (dataFileEntry) {
+ tryToUploadFile();
+ }
+ }
+ display('Connection type: ' + networkState);
+}
+```
+
+When the online event fires in the preceding code, call the app's
`tryToUploadFile` function.
+
+If the FileTransfer object's upload function fails, call the app's
`offlineWrite` function to save the current data somewhere.
+
+>*Note* This example requires the FileTransfer plugin.
+
+```js
+function tryToUploadFile() {
+ // !! Assumes variable fileURL contains a valid URL to a text file on
the device,
+ var fileURL = getDataFileEntry().toURL();
+
+ var success = function (r) {
+ console.log("Response = " + r.response);
+ display("Uploaded. Response: " + r.response);
+ }
+
+ var fail = function (error) {
+ console.log("An error has occurred: Code = " + error.code);
+ offlineWrite("Failed to upload: some offline data");
+ }
+
+ var options = new FileUploadOptions();
+ options.fileKey = "file";
+ options.fileName = fileURL.substr(fileURL.lastIndexOf('/') + 1);
+ options.mimeType = "text/plain";
+
+ var ft = new FileTransfer();
+ // Make sure you add the domain of your server URL to the
+ // Content-Security-Policy <meta> element in index.html.
+ ft.upload(fileURL, encodeURI(SERVER), success, fail, options);
+};
+```
+
+In addition to calling `offlineWrite` from the error handler for the
upload function, you also call the same `offlineWrite` function from the app's
offline event handler.
+
+```js
+function onOffline() {
--- End diff --
It would be nice to clarify why you would want to write data when going
offline. It looks like the purpose of the `offlineWrite` function is to write
data generated by the app to some local location so that it can be uploaded as
soon as you go online. Do you need to use the offline event at all in this
particular scenario? It seems like the existence of that temp file would be
enough to indicate that you were offline at some point (though I guess it
wouldn't show when you went offline).
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