extjs - How to add custom code on the click of Today button with xtype: 'datefield' -

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How to add custom code to the click of a button with xtype: 'Datefield'

For example : Adding a custom date after clicking on "Today" button 

  Ext.create ('Ext.form.Panel', {rendersTo: Ext.getBody (), width: 300, bodypadding: 10, Title: 'Dates', items: [[xtype: 'Datefield', Anchor: '100%', field label: 'to', name: 'from_date', maximum value: new date () // current date or Limited to the east;]}}); As  
 
 
 As @ A RR pin states, there is an implementation here which gets the button from the picker.  
  var picker = Ext.create ('Ext.form.field.Date', {anchor: '100%', field label: 'to', name: 'from_date', maxValue: New date ()}); Var Field = Ext.create ('Ext.form.Panel', {rendersTo: Ext.getBody (), Width: 400, Height: 400, Title: 'Dates', Item: [Picker]}); Picker.getPicker () TodayBtn.on ('click', function () {warning ('hello');});

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