What is the best way to periodically verify internet connectivity in Phonegap?

Question

What is the best way to periodically verify internet connectivity in Phonegap?

Currently, I am using Phonegap and need to continuously check the network connection as I am retrieving data from a server. If there is no network connection, I must display an error alert.

After researching online for a solution, I stumbled upon some code that checks the network connection type. However, this solution only works once when the application is launched. My requirement is to monitor the connection periodically, especially since I am engaging in socket programming. It's crucial for me to receive immediate notifications if there are any connectivity issues. Unfortunately, the existing code only provides feedback at the initial launch.

javascript cordova jquery-mobile

Answer 1

Answer №1

Here is a demonstration of the concept in action: http://jsfiddle.net/Gajotres/d5XYR/

The idea is to use an interval timer to periodically check the internet connection status. This method relies on HTML5 capabilities, which should not be an issue since jQuery Mobile already requires HTML5 compatibility. The timer will assess the internet connection every 100 milliseconds and update a global JavaScript variable with the result.

The crucial aspect lies in this single line of code:

window.navigator.onLine -- this will return false if the user is offline.

This is how you can implement the solution:

var connectionStatus = false;

$(document).on('pagebeforeshow', '#index', function () {
    setInterval(function () {
        connectionStatus = navigator.onLine ? 'online' : 'offline';
    }, 100);
    $(document).on('click', '#check-connection', function () {
        alert(connectionStatus);
    });
});

Compatibility tested on:

Windows Firefox
Windows Google Chrome
Internet Explorer 9 and 10 on Windows
Chrome on Android 4.1.1
Safari on iPad 3
Chrome on iPad 3

Answer 2

Here is a demonstration of the concept in action: http://jsfiddle.net/Gajotres/d5XYR/

The idea is to use an interval timer to periodically check the internet connection status. This method relies on HTML5 capabilities, which should not be an issue since jQuery Mobile already requires HTML5 compatibility. The timer will assess the internet connection every 100 milliseconds and update a global JavaScript variable with the result.

The crucial aspect lies in this single line of code:

window.navigator.onLine -- this will return false if the user is offline.

This is how you can implement the solution:

var connectionStatus = false;

$(document).on('pagebeforeshow', '#index', function () {
    setInterval(function () {
        connectionStatus = navigator.onLine ? 'online' : 'offline';
    }, 100);
    $(document).on('click', '#check-connection', function () {
        alert(connectionStatus);
    });
});

Compatibility tested on:

Windows Firefox
Windows Google Chrome
Internet Explorer 9 and 10 on Windows
Chrome on Android 4.1.1
Safari on iPad 3
Chrome on iPad 3

Answer 3

Answer №2

To ensure your App is aware of its online or offline status, consider implementing the 'online' and 'offline' event listeners on the document. Detailed information can be found in the documentation, available here:

Answer 4

To ensure your App is aware of its online or offline status, consider implementing the 'online' and 'offline' event listeners on the document. Detailed information can be found in the documentation, available here:

Answer 5

Answer №3

Regrettably, the answer lacks stability on Chrome, Safari, and various mobile browsers. Instead of providing the actual "Internet connection" status, it only reflects the "network connection state." Please refer to this source for more information:

https://developer.mozilla.org/en-US/docs/Web/API/window.navigator.onLine

"In Chrome and Safari, if the browser cannot connect to a local area network (LAN) or router, it indicates that it is offline; other conditions return true. Therefore, receiving a false value may suggest the browser is offline, but a true value does not necessarily guarantee internet access. There may be instances where the browser shows true even when it's connected to virtualization software with always-on virtual ethernet adapters. For accurate online status detection, additional methods are required. Refer to the HTML5 Rocks article 'Working Off the Grid' for more details."

For a reliable solution, read the HTML5 Rocks article mentioned above - bear in mind that it may require some additional effort:

http://www.html5rocks.com/en/mobile/workingoffthegrid/

Answer 6

Regrettably, the answer lacks stability on Chrome, Safari, and various mobile browsers. Instead of providing the actual "Internet connection" status, it only reflects the "network connection state." Please refer to this source for more information:

https://developer.mozilla.org/en-US/docs/Web/API/window.navigator.onLine

"In Chrome and Safari, if the browser cannot connect to a local area network (LAN) or router, it indicates that it is offline; other conditions return true. Therefore, receiving a false value may suggest the browser is offline, but a true value does not necessarily guarantee internet access. There may be instances where the browser shows true even when it's connected to virtualization software with always-on virtual ethernet adapters. For accurate online status detection, additional methods are required. Refer to the HTML5 Rocks article 'Working Off the Grid' for more details."

For a reliable solution, read the HTML5 Rocks article mentioned above - bear in mind that it may require some additional effort:

http://www.html5rocks.com/en/mobile/workingoffthegrid/

Answer 7

Answer №4

Give this code a try:

<script>
        $(document).ready(function () {
            document.addEventListener("deviceready", onDeviceReady, false);
            document.addEventListener("online", onOnline, false);
            document.addEventListener("offline", onOffline, false);

        function onDeviceReady() {
            //onDeviceReaddy
        }

        function onOnline() {
            //onOnline
        }

        function onOffline() {
            navigator.notification.alert(
                'Please Ensure Your Internet Connection is Active.', // message
                null, // callback
                'AllCare Doctor', // title
                'OK' // buttonName
            );
        }

 </script>

To learn more, visit this link..!

Answer 8

Give this code a try:

<script>
        $(document).ready(function () {
            document.addEventListener("deviceready", onDeviceReady, false);
            document.addEventListener("online", onOnline, false);
            document.addEventListener("offline", onOffline, false);

        function onDeviceReady() {
            //onDeviceReaddy
        }

        function onOnline() {
            //onOnline
        }

        function onOffline() {
            navigator.notification.alert(
                'Please Ensure Your Internet Connection is Active.', // message
                null, // callback
                'AllCare Doctor', // title
                'OK' // buttonName
            );
        }

 </script>

To learn more, visit this link..!

What is the best way to periodically verify internet connectivity in Phonegap?

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

Storing HTML input data into an external JSON file

Controlling the first displayed page with JQuery Multi-Page functionality

Angular2 - HTML not displaying the response

Tips for displaying an alert in the upcoming event loop

Filtering array data in React.js based on external conditions can be achieved by using methods like the filter()

Is there a way to eliminate duplicate elements from 2 arrays in Angular?

Steps for removing multiple parameters from a URL using JavaScript

What could be the reason for TypeScript being unable to recognize my function?

Validation of user input alongside input masking using jQuery

Selecting the Right JSON File for Your D3 Force-Directed Graph

Can JQuery be used to specifically target attributes with vendor prefixes?

What is the method for retrieving the input text value contained within a select option?

Generating dynamic rowspan values for nested levels within a multi-level table using JavaScript and a JSON array

Tips for avoiding the "MongoError: Transaction 1 has already been committed." error

Attempting to leverage the combination of Express and Redis to create a secure login webpage

Show that a CPU-intensive JavaScript function is executing (animated GIF spinners do not spin)

Guide for skipping the presentation of data in column1, when column2 contains multiple lines of content

Are there any security risks in transmitting a hashed password through req.user with passportJS?

Leverage a different service within a service function in AngularJs

Using a div in React to create a vertical gap between two React elements