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The onkeypress property sets and returns the onKeyPress event handler code for the current element.

Syntax

element.onkeypress = event handling code

Notes

The keypress event should be raised when the user presses a key on the keyboard. However, not all browsers fire keypress events for certain keys.

Browser Incompatibilities

Webkit-based browsers (Google Chrome and Safari, for example) do not fire keypress events on the arrow keys

Firefox does not fire keypress events on modifier keys like SHIFT

Examples

Example 1: Filter the digitation in a form field through a regular expression

The following example shows the use of the onkeypress event during a digitation into a form field in order to filter the typed characters:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Example</title>
<script>
  function numbersOnly(oToCheckField, oKeyEvent) {
    return oKeyEvent.charCode === 0 || /\d/.test(String.fromCharCode(oKeyEvent.charCode));
  }
</script>
</head>

<body>
<form name="myForm">
<p>Enter numbers only: <input type="text" name="myInput" onkeypress="return numbersOnly(this, event);" onpaste="return false;" /></p>
</form>
</body>
</html>

Example 2: Capture the typing of a hidden word

The following example will do something after the user types the word "exit" in any point of a page.

Note: A more complete framework for capturing the typing of hidden words is available on GitHub.
/* Type the word "exit" in any point of your page... */

(function () {

  var sSecret = /* chose your hidden word...: */ "exit", nOffset = 0;

  document.onkeypress = function (oPEvt) {
    var oEvent = oPEvt || window.event, nChr = oEvent.charCode, sNodeType = oEvent.target.nodeName.toUpperCase();
    if (nChr === 0 || oEvent.target.contentEditable.toUpperCase() === "TRUE" || sNodeType === "TEXTAREA" || sNodeType === "INPUT" && oEvent.target.type.toUpperCase() === "TEXT") { return true; }
    if (nChr !== sSecret.charCodeAt(nOffset)) {
      nOffset = nChr === sSecret.charCodeAt(0) ? 1 : 0;
    } else if (nOffset < sSecret.length - 1) {
      nOffset++;
    } else {
      nOffset = 0;
      /* do something here... */
      alert("Yesss!!!");
      location.assign("http://developer.mozilla.org/");
    }
    return true;
  };
})();

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'onkeypress' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support YesEdge Full support YesFirefox Full support YesIE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

Schlagwörter des Dokuments und Mitwirkende

Zuletzt aktualisiert von: sideshowbarker,