从JavaScript获取变量到Dart [英] Get variable from JavaScript into Dart

问题描述

我有一个JavaScript库被导入我的HTML文档头。如何从此库中访问对象？

谢谢。

解决方案

p> JavaScript的互操作在文章'使用JavaScript from Dart：the js Library'

简而言之，您必须：

  //导入JS互操作库
 import'package：js / js.dart'as js; 
 
 //访问页面的JS上下文
 var context = js.context; 
 
 //然后使用上下文来访问JS对象
 var canvas = query（'＃map_canvas'）; 
 var googlemaps = js.context.google.maps; 
 
 //并创建通过代理访问的JS对象
 var googlemap = new js.Proxy（googlemaps.Map，canvas）; 
  

有关详细信息（范围，生命周期，回调等）和示例， / p>

I have a JavaScript library being imported in my HTML Documents head. How can I access objects from this library?

Thank you.

解决方案

The interop with JavaScript is desribed in article 'Using JavaScript from Dart: The js Library'

In short, you have to:

//import the JS interop lib
import 'package:js/js.dart' as js;

// access the JS context for the page
var context = js.context;

// then use context to access JS object
var canvas = query('#map_canvas');
var googlemaps = js.context.google.maps;

// and create JS objects accessed through proxies
var googlemap = new js.Proxy(googlemaps.Map, canvas);

For more details (scopes, lifetimes, callbacks, etc) and examples, refer to linked article.

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