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Document TOP » API Reference » Core Cordova Plugins » Network Information Plugin

Network Information Plugin

Tested Version: 1.3.3

Note

This document is based on the original Cordova docs available at Cordova Docs.

This plugin provides an implementation of an old version of the Network Information API. It provides information about the device’s cellular and wifi connection, and whether the device has an internet connection.

Plugin ID

cordova-plugin-network-information

Adding the Plugin in Monaca

In order to use this plugin, please enable Network Information plugin in Monaca Cloud IDE.

Supported Platforms

  • Android
  • iOS
  • Windows

Reference

Connection

The connection object, exposed via navigator.connection, provides information about the device’s cellular and wifi connection.

Properties

  • connection.type

Constants

  • Connection.UNKNOWN
  • Connection.ETHERNET
  • Connection.WIFI
  • Connection.CELL_2G
  • Connection.CELL_3G
  • Connection.CELL_4G
  • Connection.CELL
  • Connection.NONE

connection.type

This property offers a fast way to determine the device’s network connection state, and type of connection.

Quick Example
function checkConnection() {
    var networkState = navigator.connection.type;

    var states = {};
    states[Connection.UNKNOWN]  = 'Unknown connection';
    states[Connection.ETHERNET] = 'Ethernet connection';
    states[Connection.WIFI]     = 'WiFi connection';
    states[Connection.CELL_2G]  = 'Cell 2G connection';
    states[Connection.CELL_3G]  = 'Cell 3G connection';
    states[Connection.CELL_4G]  = 'Cell 4G connection';
    states[Connection.CELL]     = 'Cell generic connection';
    states[Connection.NONE]     = 'No network connection';

    alert('Connection type: ' + states[networkState]);
}

checkConnection();
API Change

Until Cordova 2.3.0, the Connection object was accessed via navigator.network.connection, after which it was changed to navigator.connection to match the W3C specification. It’s still available at its original location, but is deprecated and will eventually be removed.

iOS Quirks
  • <iOS7 can’t detect the type of cellular network connection.
    • navigator.connection.type is set to Connection.CELL for all cellular data.
Windows Quirks
  • When running in the Phone 8.1 emulator, always detects navigator.connection.type as Connection.ETHERNET.

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.

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.

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.

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.

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);
};

Here is the code for the offlineWrite function.

Note

This code examples requires the File plugin.

function offlineWrite(offlineData) {
    // Create a FileWriter object for our FileEntry.
    dataFileEntry.createWriter(function (fileWriter) {

        fileWriter.onwriteend = function () {
            console.log("Successful file write...");
            display(offlineData);
        };

        fileWriter.onerror = function (e) {
            console.log("Failed file write: " + e.toString());
        };

        fileWriter.write(offlineData);
    });
}

If the offline event occurs, just do something like notify the user (for this example, just log it).

function onOffline() {
    // Handle the offline event
    console.log("lost connection");
}