Fire Event before 'focus' kicks in / Fire Event before keyboard appears on iOS

问题

I want to fire off an event before my focus on a textarea (i.e. before the keyboard appears on iOS).

Is this possible?

My code to handle the focus is here:

$(document).on('focus', 'textarea', function() {
    console.log("focus event");
});

回答1:

Try touchstart Event

$(document).on('touchstart', 'textarea', function() {
console.log("touchstart event");
  });

回答2:

I would use the focusin event note that this event catch the child elements focus as well.

focusin: sent before first target element receives focus

$("div").focusin(function(){
    $(this).css("background-color", "#FFFFCC");
}); 

Check here to know more about the focus events order

来源：https://stackoverflow.com/questions/24570852/fire-event-before-focus-kicks-in-fire-event-before-keyboard-appears-on-ios