ExtJs check if form values has changed

is there a possibility to check if 开发者_JAVA技巧form values has changed in ExtJs?

Thanks

myForm.getForm().items.each(function(field){field.on('change',function(f,n,o){alert('detected! '+f.label+' value changed from '+o+' to '+n);});});

In the above snippet, what you are basically doing is -

• Iterate over all fields in the form (myForm.getForm().items.each())
• For each field, add a change listener. (field.on(...))
• When a field's value is changed, the listener will be invoked with the field info and old and new value.
• In the listener, change the alert with the appropriate logic.