How to get the key TAB event on an input element?

问题

I try to trigger a button when in an input field the return key has been hit. This works. But if I hit the tab key nothing is triggered because the TAB key event isn't captured.

Fiddle example

Here is my JQ code snippet for example:

$("input[name=input]").on("keypress, keydown, keyup", function(e) {
  var code = e.keyCode || e.which;
  if ( code == 13 || code == 9 ) {
    $("input[name=btn]").trigger("click");
  }
});

I can't figure out how to get the tab key stroke working like a return key stroke.

回答1:

Use Event.preventDefault() to prevent the browser switching focus on Tab press.
Listen for "keydown" event only
Use KeyboardEvent.key instead

JavaScript's which and keyCode are deprecated, historically they both become a mess.
Even if jQuery normalizes with jQueryEvent.which for both Event.keyCode and Event.which crossbrowser, I think we should abandon the two and use the more human friendly Event.key. What makes more sense, 9 or 'Tab'? 13 or 'Enter'? 42 or... what is 42 anyways

$('input[name=input]').on('keydown', function(evt) {
  if (evt.key === 'Tab' || evt.key === 'Enter') {
    evt.preventDefault();
    $('input[name=btn]').trigger('click');
  }
});

回答2:

Only bind the keydown event.
return false and preventDefault on tab key so the focus is not lost.

Demo: http://jsfiddle.net/a08t4o7r/3/

$("input[name=input]").on("keydown", function(e) {
    var code = e.keyCode || e.which;

    if ( code == 13 || code == 9 ) {
        e.preventDefault();
        $("input[name=btn]").trigger("click");
        return false;
    }
});

来源：https://stackoverflow.com/questions/28084191/how-to-get-the-key-tab-event-on-an-input-element

标签

jquery

keyup

keystroke