Added defaultValue property to Multipletextitem - DC

[ChopinDavid]

This is being done in an effort to resolve #70

[goxiaoy]

Try this json in https://surveyjs.io/create-free-survey

{
 "logoPosition": "right",
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "multipletext",
     "name": "question1",
     "items": [
      {
       "name": "text1",
       "defaultValue":"abc",
      },
      {
       "name": "text2"
      }
     ]
    }
   ]
  }
 ]
}

It shows error

I believe that you would like to use the defaultValue in Multipletext instead of Multipletextitem

[ChopinDavid]

@goxiaoy You're correct, that is my fault. I was thinking I would need Multipletextitem.defaultValue to exist so that I could map it to Text.defaultValue in multiple_text.dart lines 47-56 much like the other elements were:

s.Text toText(s.Multipletextitem multipleTextItem) {
  final b = s.Text().toBuilder()
    ..type = "text"
    ..name = multipleTextItem.name
    ..isRequired = multipleTextItem.isRequired
    ..validators = ListBuilder(multipleTextItem.validators?.toList() ?? [])
    ..inputType = s.TextInputType.valueOf(multipleTextItem.inputType.toString())
    ..title = multipleTextItem.title
    ..maxLength = multipleTextItem.maxLength
    ..size = multipleTextItem.size
    ..requiredErrorText = multipleTextItem.requiredErrorText
    ..placeholder = multipleTextItem.placeholder;
    //.defaultValue = multipleTextItem.defaultValue;

  return b.build();
}

Of course, we see in #74 that we end up passing JsonObject? defaultValue to toText, which negates the need for multipleTextItem.defaultValue to exist:

s.Text toText(s.Multipletextitem multipleTextItem, JsonObject? defaultValue) {
  final Object? defaultValueForItem = defaultValue is MapJsonObject
      ? defaultValue.value[multipleTextItem.name]
      : defaultValue;
  final b = s.Text().toBuilder()
    ..type = "text"
    ..name = multipleTextItem.name
    ..isRequired = multipleTextItem.isRequired
    ..validators = ListBuilder(multipleTextItem.validators?.toList() ?? [])
    ..inputType = s.TextInputType.valueOf(multipleTextItem.inputType.toString())
    ..title = multipleTextItem.title
    ..maxLength = multipleTextItem.maxLength
    ..size = multipleTextItem.size
    ..requiredErrorText = multipleTextItem.requiredErrorText
    ..placeholder = multipleTextItem.placeholder
    ..defaultValue =
        defaultValueForItem == null ? null : JsonObject(defaultValueForItem);

  return b.build();
}

[goxiaoy]

@ChopinDavid This is handled now

flutter_survey_js/lib/ui/elements/multiple_text.dart

Lines 39 to 47 in 51689e5

	AbstractControl multipleTextControlBuilder(
	BuildContext context, s.Elementbase element,
	{validators = const []}) {
	final e = element as s.Multipletext;
	final texts = (e.items?.toList() ?? []).map(toText).toList();
	final res = elementsToFormGroup(context, texts,
	validators: validators, value: e.defaultValue?.value);
	return res;
	}