1 // (works, so touching the right OM)
   2 Ext.select('.x-tree-icon').each(function(el){
   3     console.log(el.getWidth());
   4 }); 
   5 
   6 
   7 //Changles icon.  QED
   8 Ext.select('.x-tree-icon-leaf').each(function(el){
   9   el.setStyle('background-image','url("http://en.wikipedia.org/favicon.ico")'));
  10 }); 
  11 
  12 
  13 // shorthand also works, but seems to be undocumented:
  14 // http://docs.sencha.com/ext-js/3-4/#!/api/Ext.CompositeElement
  15 // I don't see it inheriting from something that'd add that.
  16 Ext.select('.x-tree-icon-leaf')
  17         .setStyle('background-image','url("http://www.apple.com/favicon.ico")');

Labels: ExtJS, javascript, jquery