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Events

 Events

The pain that is JavaScript events done easily using jQuery.

John Nunemaker

November 15, 2010
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  1. Example Events • Mouse click • Mouse over and out

    • Page or image load • Form submit • Keyboard keystroke
  2. ready Binds a function to be executed when the DOM

    is ready to be traversed and manipulated http://docs.jquery.com/Events/ready
  3. // stuff right here will run immediately $(document).ready(function() { //

    anything in here will only // run when the page first loads }); // stuff right here will run immediately
  4. This is needed when you run JavaScript that is in

    different files or in the <head> of your HTML document.
  5. Mouse and Keyboard Related Events click, double click, keydown, keyup,

    keypress, mousedown, mouseenter, mouseleave, mousemove, mouseout, mouseover, mouseup, scroll
  6. bind Bind a function to an event for all matched

    elements. http://docs.jquery.com/Events/bind
  7. get all a elements and bind to their click event

    the anonymous function. $('a').bind('click', function(event) { alert('You just clicked a link!'); });
  8. $('a').bind('click', function(event) { this; // clark kent DOM element just

    like .each $(this); // superman jQuery object });
  9. jQuery Event Object Normalizes event object across browsers. Guaranteed to

    be first argument to every bound function. http://docs.jquery.com/Events/jQuery.Event
  10. $('a').bind('click', function(event) { event; }); $('a').bind('click', function(evt) { evt; });

    $('a').bind('click', function(e) { e; }); Name it whatever you want, these are the common ones. event, evt, e
  11. click Binds a function to the click event of each

    matched element http://docs.jquery.com/Events/click#fn http://teaching.johnnunemaker.com/capp-30550/examples/click-event/
  12. double click Binds a function to the double click event

    of each matched element http://docs.jquery.com/Events/dblclick#fn http://teaching.johnnunemaker.com/capp-30550/examples/double-click-event/
  13. keypress Binds a function to the keypress event for each

    matched element http://docs.jquery.com/Events/keypress#fn http://teaching.johnnunemaker.com/capp-30550/examples/keypress-event/
  14. mouseover/mouseout Bind a function to the mouseover or mouseout event

    of each matched element. http://docs.jquery.com/Events/mouseover#fn http://docs.jquery.com/Events/mouseout#fn http://teaching.johnnunemaker.com/capp-30550/examples/mouseovermouseout/
  15. mousemove Bind a function to the mousemove event of each

    matched element. http://docs.jquery.com/Events/mousemove#fn http://teaching.johnnunemaker.com/capp-30550/examples/mousemove-event/
  16. scroll Bind a function to when document view is scrolled

    http://docs.jquery.com/Events/scroll#fn http://teaching.johnnunemaker.com/capp-30550/examples/scroll-event/