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📅  最后修改于: 2020-12-09 05:31:21             🧑  作者: Mango

Cordova项目中可以使用各种事件。下表显示了可用事件。

S.No Events & Details
1

deviceReady

This event is triggered once Cordova is fully loaded. This helps to ensure that no Cordova functions are called before everything is loaded.
2

pause

This event is triggered when the app is put into background.
3

resume

This event is triggered when the app is returned from background.
4

backbutton

This event is triggered when the back button is pressed.
5

menubutton

This event is triggered when the 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.

使用事件

所有事件的使用方式几乎相同。由于Cordova内容安全策略不允许使用内联Javascript，因此我们应始终在js中添加事件侦听器，而不是内联事件调用。如果我们尝试内联调用事件，将显示以下错误。

事件错误

使用事件的正确方法是使用addEventListener 。通过一个示例，我们将了解如何使用volumeupbutton事件。

document.addEventListener("volumeupbutton", callbackFunction, false);  
function callbackFunction() { 
   alert('Volume Up Button is pressed!');
}

一旦按下音量调高按钮，屏幕将显示以下警报。

活动量增加

处理后退按钮

我们应将Android后退按钮用于应用功能，例如返回上一屏幕。要实现您自己的功能，我们首先应禁用用于退出该应用的后退按钮。

document.addEventListener("backbutton", onBackKeyDown, false);  
function onBackKeyDown(e) { 
   e.preventDefault(); 
   alert('Back Button is Pressed!'); 
}

现在，当我们按下原生的Android后退按钮时，警报将出现在屏幕上，而不是退出应用程序。这是通过使用e.preventDefault()命令完成的。

事件后退按钮