如何从 angular.dart 组件内部调用 jquery 插件? [英] how to call a jquery plugin from inside an angular.dart component?

问题描述

我正在通过尝试制作一个可以访问现有 jquery 插件的组件来了解 angular.dart 组件.我正在尝试类似以下内容:

I am learning about angular.dart components by trying to make one that will access an existing jquery plugin. I am trying something like the following:

library mylib;

import 'dart:html'; // querySelector
import 'package:js/js.dart'; // javascript 
import 'package:angular/angular.dart';

@NgComponent(
    selector: 'aSelector',
    templateUrl: 'partial.html',
    cssUrl: 'style.css',
    publishAs: 'ctrl',
    map: const {
      'param': '=>param'
    }
)
class myComponent extends NgShadowRootAware {
  String param;
  Compiler compiler;
  Injector injector;
  Scope scope;

  MyComponent(this.compiler, this.injector, this.scope);

  void onShadowRoot(ShadowRoot shadowRoot) {
    this.scope.$watch((int) => shadowRoot.querySelector('.myContainer').text.length, (currentValue, previousValue, Scope scope) {
      if (currentValue != previousValue) {
        var container = context.jQuery('.myContainer', shadowRoot);
        var options = map({
          'p1': 1,
          'p2': 2
        });
        container.jqplugin(options);
      }
    });
  }
}

不幸的是，容器"似乎是空的......如何让 jQuery 选择一个组件内的元素，即在 shadow dom 中?

Unfortunately, the 'container' seems to be empty... How to make jQuery select an element that is inside a component, i.e. in shadow dom?

顺便说一句，目前推荐的 js 导入方式是什么?我发现了这个:

BTW, what is the currently recomended way to import js? I have found this:

import 'package:js/js.dart' as js;

但是现在包 js 的部分功能被移到 dart:js 中，我不确定应该做什么.

but now that some part of the functionality of package js being moved into dart:js, I'm not sure what one is supposed to do.

推荐答案

问题似乎是 jQuery 问题.也许它适用于:

The problem seems to be a jQuery problem. Perhaps it would work with :

var container = context.jQuery(shadowRoot.querySelector('.myContainer'));

关于 dart:js 与 package:js(参见 你是如何与 dart 中的 js 交互的?) :

About dart:js versus package:js (see How do you interact with js from dart?) :

package:js 提供了一个更简单的 Api，但代价是增加了 js 的大小(因为 package:js 使用了 dart:mirrorsem> 和 noSuchMethod).

package:js provides a simpler Api that comes at the cost of an increase of the js size (because package:js uses dart:mirrors and noSuchMethod).

关于 js 命名空间，您可以随心所欲.我个人更喜欢使用前缀来更好地查看与 Js 的交互何时完成.但这是一个品味问题.

About js namespace you can do what you want. I personnaly prefer to use a prefix to better see when interaction with Js is done. But it's a matter of taste.

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