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7988Re: [ydn-javascript] Re: KeyListener problems

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  • Eric Miraglia
    Dec 30, 2006
    • 0 Attachment

      Valid question.  KeyListener was developed as part of the Container package to serve specific needs related to Container-family controls -- like dismissing Panels or Dialogs using the <escape> key.  For an example of this type of implementation, go to http://developer.yahoo.com/yui/menu/ and click on the Release Notes link; the release notes for the Menu Control pop up in a Panel, but they can be dismissed with a <escape> — much more accessible (and easier on the hands) than aiming a mouse at the tiny close button.

      The Menu Control itself, which was built upon Container as a foundation, leverages KeyListener extensively and is one of the most keyboard-accessible DHTML controls in YUI.  Check out any of the Menu examples, navigating and selecting with your keyboard, to get a sense for the work Todd Kloots did on that part of the control.

      At the end of the day, your underlying point is still a good one — right now you need to include the Container Core package to use KeyListener, which isn't the most intuitive arrangement.  As you say, it does have utility for non-Container implementations.  That's something we're looking at as we go forward.


      Eric Miraglia
      Yahoo! User Interface Library

      On Dec 29, 2006, at 4:37 PM, randomjuju wrote:

      Hi there!

      This may belong in another thread, but I was wondering why KeyListener
      is part of the Container collection. It seems to me that it'd be
      handy in lots of other situations, too.



      --- In ydn-javascript@yahoogroups.com, "Steven Peterson"
      <y_stevenp@...> wrote:
      > In your function, e does not represent an event, so using the Event
      > against it will not work. KeyListener uses a CustomEvent, so the
      > are (type, args, obj), so you should look in the args array to get
      both the
      > DOM event (the first arg) and the code for the key that was pressed (the
      > second arg). When you pass your handler to the KeyListener, it is
      > to the internal "keyEvent" CustomEvent, and all of the abstract
      > between keyCode and charCode are handled under the hood.
      > Steven Peterson
      > Web Developer, Platform Engineering
      > Yahoo!
      > From: ydn-javascript@yahoogroups.com
      > On Behalf Of itsallaboutyui
      > Sent: Friday, December 29, 2006 3:36 PM
      > To: ydn-javascript@yahoogroups.com
      > Subject: [ydn-javascript] KeyListener problems
      > I have an object containing the following code
      > var kl2 = new YAHOO.util.KeyListener(document, {
      > keys:[74,175,170,171,172,174,176] },
      > {
      > fn:this.kp},correctScope:true } );
      > kl2.enable();
      > //this.kp is a function within the object which calls
      > kp : function(e){
      > YAHOO.log('pressed: ' + $E.getCharCode(e));
      > }
      > but the charCode is always 0. I'm stumped. 74 is a keypress for J.

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