Hotfix for pnp#1937 and 1961. Enabled the allowTextInput on date fields

Author: wuxiaojun514

src/controls/dynamicForm/DynamicForm.tsx

@@ -459,7 +459,7 @@ export class DynamicFormBase extends React.Component<
         if (fieldcolumnInternalName.startsWith('_x') || fieldcolumnInternalName.startsWith('_')) {
           fieldcolumnInternalName = `OData_${fieldcolumnInternalName}`;
         }
-        if (field.newValue !== null && field.newValue !== undefined) {
+        if (field.newValue !== undefined) {
 
           let value = field.newValue;
 
@@ -491,7 +491,7 @@ export class DynamicFormBase extends React.Component<
               value.push(element.key);
             });
             objects[`${fieldcolumnInternalName}Id`] = {
-              results: value.length === 0 ? null : value,
+              results: value.length === 0 ? [] : value,
             };
           }
 
@@ -774,7 +774,7 @@ export class DynamicFormBase extends React.Component<
     const { useModernTaxonomyPicker } = this.props;
     // Init new value(s)
     field.newValue = newValue;
-    field.stringValue = newValue.toString();
+    field.stringValue = newValue? newValue.toString():'';
     field.additionalData = additionalData;
     field.subPropertyValues = {};
 

src/controls/dynamicForm/dynamicField/DynamicField.tsx

@@ -353,6 +353,7 @@ export class DynamicFieldBase extends React.Component<IDynamicFieldProps, IDynam
               onSelectDate={(newDate) => { this.onChange(newDate, true); }}
               disabled={disabled}
               firstDayOfWeek={firstDayOfWeek}
+              allowTextInput={true}
             />}
           {
             dateFormat === 'DateTime' &&
@@ -364,6 +365,7 @@ export class DynamicFieldBase extends React.Component<IDynamicFieldProps, IDynam
               onChange={(newDate) => { this.onChange(newDate, true); }}
               disabled={disabled}
               firstDayOfWeek={firstDayOfWeek}
+              allowTextInput={true}
             />
           }
           {descriptionEl}