CODEWITHSUNDEEP
dartangular-dart
gabor.orosz
gabor.orosz

Reputation: 443

AngularDart How to Create Component

I just started to learning from this tutorial: https://github.com/angular/angular.dart.tutorial/wiki/Creating-a-Custom-Component

I'm just stucked with a problem, and looking for some help. The rating component does not show for me, none of the methods called (at least not at any breakpoint). Here you can see the code: https://www.dropbox.com/s/oizzl9k6nclgoqd/SecondAngularDart.zip

Please help me with some guidence, how can I debug a situation like this? Or what the problem is?

@NgComponent(
  selector:'rating',
  templateUrl:'rating_component.html',
  cssUrl:'rating_component.css',
  publishAs:'cmp'
)
class RatingComponent {
  static const String _starOnChar = "\u2605";
  static const String _starOffChar = "\u2606";
  static const String _starOnClass = "star-on";
  static const String _starOffClass = "star-off";

  List<int> stars = [];

  @NgTwoWay('rating')
  int rating;

  @NgAttr('max-rating')
  int maxRating(String max) {
    stars = [];
    var count = max == null ? 5 : int.parse(max);
    for(var i=1; i <= count; i++) {
      stars.add(i);
    }
  }

  String starClass(int star) {
    return star > rating ? _starOffClass : _starOnClass;
  }

  String starChar(int star) {
    return star > rating ? _starOffChar : _starOnChar;
  }

  void handleClick(int star) {
    if (star == 1 && rating == 1) {
      rating = 0;
    } else {
      rating = star;
    }
  }
}

Upvotes: 0

Views: 799

Answers (2)

gabor.orosz
gabor.orosz

Reputation: 443

Okay, it was a beginner mistake, but I used the component this way:

<rating max-rating="5" rating="{{ctrl.selectedRecipe.ratings}}"></rating>

But should be used this way:

<rating max-rating="5" rating="ctrl.selectedRecipe.ratings"></rating>

Upvotes: 1

Ozan
Ozan

Reputation: 4415

You have annotated a function with @NgAttr('max-rating'). Those data-binding annotations only work with fields or setters:

@NgAttr('max-rating')
set maxRating(String max) {
  stars = [];
  var count = max == null ? 5 : int.parse(max);
  for(var i=1; i <= count; i++) {
    stars.add(i);
  }
}

Also, in starClass and starChar you access rating, which could be null:

String starClass(int star) {
  if (rating != null) {
    return star > rating ? _starOffClass : _starOnClass;
  }
}

Upvotes: 1

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