问题
I have the following setup:
- iPad with Safari browser running a webb-application.
- Bluetooth barcode-scanner connected/paired with the iPad.
My web-application listens to keypress events globally which gives me the possibility to trigger scan functions without having the user to focus a textfield in the webb-application.
The above works fine when running the application on a desktop with an USB-scanner.
My problem is that the application doesn't trigger keydown(press/up) events until a textfield is focused on the iPad when the bluetooth-scanner is connected.
Is it possible to achieve?
A related question from a while ago: How can I add a Javascript listener to capture input from bluetooth barcode scanner to iPad?
Thanks /E
回答1:
I believe that with mobile Safari (and most other iOS mobile browsers), keypresses are only detectable by the web app when a form input is infocus. Your device (without an external keyboard) can't take keypress input without a form input being selected simply because the keyboard would not be up.
来源：https://stackoverflow.com/questions/11418061/listen-to-keypress-in-html-javascript-on-ios-safari-with-bluetooth-scanner-keybo