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    Element.onkeypress

    Summary

    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

    Specification

    Not part of specification.

    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 digitation of a hidden word

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

    /* 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;
      };
    
    })();

    Document Tags and Contributors

    Contributors to this page: teoli
    Last updated by: teoli,