If you don't want your users to be able to enter dates into period selector's input fields, you can use simple method from this demo. It uses rendered
event handler to grab all date selector inputs and adds readOnly
property to them, making them non-editable.
var chart = AmCharts.makeChart( "chartdiv", { // ... "listeners": [{ "event": "rendered", "method": function( e ) { var fields = e.chart.div.getElementsByClassName( "amChartsInputField" ); for(var i = 0; i < fields.length; i++) { fields[i].readOnly = true; } } }] } );