Use the following code to create a basic inputEx MultiAutoComplete. (note: this example doesn't work offline)
var field = new Y.inputEx.MultiAutoComplete({ parentEl: 'container1', label: 'Search US state', // autocompleter options autoComp: { source: ["aaa","bbb","cccc","ccc","dddddd"], minQueryLength: 2, maxResultsDisplayed: 50 } }); var logDiv = inputEx.cn('div', null, null, ""); Y.one('#container1').appendChild(logDiv); field.on("updated",function(v) { var value = Y.JSON.stringify(v); logDiv.appendChild( inputEx.cn('div',null,null,"Updated at "+(new Date())+" "+value) ); });