jQuery: if key "someKey" pressed

Question

i know that i can detect a key, which has been pressed with the following code:

$('input').keyup(function (e){
if(e.keyCode == 13){
    alert('enter');
  }
})

But i need to know if any key was pressed. pseudocode:

if ($('input').keyup() == true)
  { 
      doNothing();
  }
  else {
      doSomething();
  }

How can I do that?

Answer 1

Because 'keyup' will be fired when ANY key is pressed, you just leave out the if...

$('input').keyup(function (e){
  // do something
})

Merging this into your current code, you could do something like...

$('input').keyup(function (e){
  alert('a key was press');

  if (e.keyCode == 13) {
      alert('and that key just so happened to be enter');
   }
})

Answer 2

$('input').keyup(function (e){
    alert("You pressed the \"Any\"-key.");
})

Answer 3

If you want to check if the user didn't press a key you could use a setInterval() function.

var interval = setInterval(function() {
    //Do this if no key was pressed.
}, 2000);

Note that you should clear the interval as well clearInterval().

Answer 4

$("input").keypress(function() {
  alert("hello.");
});