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?

keyup is fired when a key is released use keydown to fire an event when a key is pressed — Petr Peller
– Petr Peller, Commented Dec 20, 2011 at 10:16

isNaN1247 · Accepted Answer · 2011-12-20 10:12:29Z

9

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');
   }
})

answered Dec 20, 2011 at 10:12

isNaN1247

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2 Comments

Keith L. Over a year ago

but i need the "else" part, if a key is not pressed. I have to handle not only the "you pressed a key" part, but also the "you pressed no key" part.

Andreas Eriksson Over a year ago

How on earth should you determine that the user didn't press a key? The absence of the .keyup() event firing means that the user currently isn't releasing a key.

Andreas Eriksson · Accepted Answer · 2011-12-20 10:13:00Z

4

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

answered Dec 20, 2011 at 10:13

Andreas Eriksson

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Comments

Filip · Accepted Answer · 2011-12-20 10:22:11Z

2

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().

answered Dec 20, 2011 at 10:22

Filip

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Comments

sascha · Accepted Answer · 2011-12-20 10:14:48Z

1

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

answered Dec 20, 2011 at 10:14

sascha

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