In the series of learning, building apps using Apache Cordova, this article will explain you which events you can use in Cordova and how to use them.
There are numerous events that can be used in Cordova mobile application projects.
The events available are listed in the following table.
Apache Cordova Events
SN | Events & Details |
1 | deviceReady This event is invoked when the Cordova is fully loaded. This ensures that no other Cordova functions are called before everything is loaded. |
2 | pause This event is triggered when the app is made run into background. |
3 | resume This event is triggered when the app is resumed from background running. |
4 | backbutton This event is triggered when the back button is pressed. |
5 | menubutton This event is triggered when menu button is pressed. |
6 | searchbutton This event is triggered when the Android search button is pressed. |
7 | startcallbutton This event is triggered when the start call button is pressed. |
8 | endcallbutton This event is triggered when the end call button is pressed. |
9 | volumedownbutton This event is triggered when the volume down button is pressed. |
10 | volumeupbutton This event is triggered when the volume up button is pressed. |
Using Events
All of the events are used in the same manner. you should always add event listeners in our js file in place of inline event calling since Cordova Content Security Policy doesn't allow inline Javascript.
The correct way of handling with events is by using addEventListener. We will show you example of using volumeupbutton event.
document.addEventListener("volumeupbutton", callbackFunction, false);
function callbackFunction()
{
alert('Volume Up Button is pressed!')
}
Handling Back Button
You generally want to use back button in your app for some app functionality like returning to previous screen. To be able to implement your own functionality, you first need to disable exiting the app when the back button is pressed.
document.addEventListener("backbutton", onBackKeyDown, false);
function onBackKeyDown(e)
{
e.preventDefault();
alert('Back Button is Pressed!');
}
Now when we press the native Android back button, the alert message will appear on screen in place of exiting the app. This is done by using a finction called e.preventDefault().
Read Our Previous Posts:Introduction to Apache Cordova
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