每次应用程序以离子形式启动时，每次执行一个函数

Question

I am using ionic framework to build my app, which seems working fine as per my requirement.

Now i close my app and reopen again it maintaining the state which is also fine.

Now my question is

1) Does app.js files run each time when my app is open ? i tried to add alert in app.js , which works only first time
Is this right or wrong ?

2) I want to run a particular function each time when my app get started. Is there is any way to do this ?

Thanks

Answer 1

There is a very large documentation which gets upgraded every time a new major version of Cordova/Phonegap is released. You can find that documentation here: Cordova Documentation 5.0

It describes an event which is called every time your "device is ready". It is called onDeviceReady . To use this event you need an onDeviceReady-EventListener. The documentation for the EventListeners can be found here: Events in Cordova

You can add that EventListener with this command:

document.addEventListener("deviceready", yourCallbackFunction, false);

Like Zain described in the comments, there is a difference between exiting the application and pausing it, there is also another EventListener which gets called when the user pauses the application. It can be attached to your application with:

document.addEventListener("pause", yourCallbackFunction, false);

So you could create a function which gets called when those two listeners are fired like this:

onDeviceReady

document.addEventListener("deviceready", deviceIsReady, false);

function deviceIsReady() {
    alert('Your device is ready!');
}

pause

document.addEventListener("pause", onPause, false);

function onPause() {
    alert('Your application is paused');
}

Alternatively, if the alert is not called when the application is paused, you could add the Cordova Plugin Console and call the onPause function with this content:

function onPause() {
    console.log('Your application is paused');
}

Please let me know, if this solves your question or if you need further assistance.