Use dataset interface instead of getAttribute

Author: wojtekmaj

src/DateTimeInput.jsx

@@ -94,7 +94,7 @@ const getDetailValueFrom = (args) => getDetailValue(args, 0);
 const getDetailValueTo = (args) => getDetailValue(args, 1);
 
 function isInternalInput(element) {
-  return element.getAttribute('data-input') === 'true';
+  return element.dataset.input === 'true';
 }
 
 function findInput(element, property) {

src/DateTimePicker.jsx

@@ -131,7 +131,7 @@ export default class DateTimePicker extends PureComponent {
     }
 
     if (openWidgetsOnFocus) {
-      if (event.target.getAttribute('data-select') === 'true') {
+      if (event.target.dataset.select === 'true') {
         return;
       }