[Rails-spinoffs] Re: Prototype - Event.observe by TagName instead of by Element.

[jdalton]

$$('input,textarea').invoke('observe', 'focus', function(event) {
  ...
});

or event deligation:
$(document.body).observe('focus', function(event){
  var element = event.element();
  if ( !/^(input|textarea)$/.test(element.tagName) ) return;

  //code here
});

 - JDD
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