[英]How to detect if the back button is pressed in mobile phone
Please how can I detect if the back button is been pressed in a mobile phone as shown in the image below 请如何检测手机中是否按下了后退按钮,如下图所示
I tried using the normal way its been done on desktop like this 我尝试使用通常的方式在台式机上完成
$(document).keypress(function(e){
if(e.keyCode == 8){
alert();
}
});
But it's not working on mobile phones. 但这不适用于手机。 Please anyone with a better clue?
请有更好线索的人吗?
One option is to use jquery mobile. 一种选择是使用jquery mobile。
Here is a code sample (of jquery mobile) 这是(jQuery Mobile的) 代码示例
$(window).on("navigate", function (event, data) {
var direction = data.state.direction;
if (direction == 'back') {
// do something
}
if (direction == 'forward') {
// do something else
}
});
Another option would be to add a 'hardwareBackPress' event listener, as demonstrated in this react-native code sample 另一个选择是添加一个“ hardwareBackPress”事件侦听器,如此本地反应代码示例所示
According to this source , to detect the 'back' key, KEYCODE_BACK = 4 on Android. 根据此消息来源 ,要检测“后退”键,在Android上为KEYCODE_BACK = 4。
Alternatively, you could integrate mobile-detect.js 或者,您可以集成mobile-detect.js
Hope this helps 希望这可以帮助
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