我在线制作棋盘游戏的网络界面.我想用Snap.load加载Snap.svg地图,即异步.

加载后,我想将一个监视添加到作用域的属性,并根据属性(这是一个对象)向地图添加一些颜色.我的代码基本上是这样的：

.controller('GameCtrl', [
  '$scope'
  '$routeParams'
  'GameService'
  (
    $scope
    $routeParams
    GameService
  ) ->
    $scope.game = GameService.get($routeParams.gameId)

    $scope.map = Snap("#map")
    Snap.load("img/classical.svg", (data) ->
      console.log "Loaded map!"
      data.select("#provinces").attr
        style: ""
      provinces = data.selectAll("#provinces path")
      for province in provinces
        province.attr
          style: ""
          fill: "#FFFFFF"
          "fill-opacity": "0"
      $scope.map.append(data)

      deregisterWatch = $scope.$watch('game', ->
        console.debug "Game loaded!", $scope.game.data.Id

        for provinceName,unit of $scope.game.data.Phase.Units
          provinceName = provinceName.replace '/', '-'

          province = $scope.map.select("##{provinceName}")

          province.attr
            style: ""
            fill: powers[unit.Nation].colour
            "fill-opacity": "0.8"

          deregisterWatch()
      )

    )

])

现在,问题是我想将地图移动到它自己的“类”或文件,但它必须以某种方式知道$scope,以便能够在加载后设置手表.

我的第一个天真的方法是提取地图并传递范围：

define([
  'snap'
], (
  Snap
) ->
  'use strict'

  Map = ($scope, selector, svgPath) ->

    that = {}
    that.provinces = {}

    ...

    that.snap = Snap(selector)
    Snap.load(svgPath, (data) ->
      console.log "Loaded map in Map!"

      data.select("#provinces").attr
        style: ""
      provinces = data.selectAll("#provinces path")
      for province in provinces

        that.provinces[province.attr("id")] = province

        province.attr
          style: ""
          fill: "#FFFFFF"
          "fill-opacity": "0"
      that.snap.append(data)

      deregisterWatch = $scope.$watch('game', ->
        console.debug "Game loaded!", $scope.game.data.Id

        for provinceName,unit of $scope.game.data.Phase.Units
          provinceName = provinceName.replace '/', '-'

          that.colourProvince(provinceName, that.powerColors[unit.Nation].colour)

          deregisterWatch()
      )
    )

    that.colourProvince = (abbr, colour) ->
      ...

    return that

  return Map
)

但我认为必须采取更有棱角的方式来做到这一点.我应该做一个指示吗？还有其他建议吗？

解决方法:

你应该考虑写一个指令.
指令旨在封装可重用组件,尤其是图形组件.

define [
  'app'  # or use any other way to get to your Angular module.
  'snap'
], (app, Snap) ->

  app.directive 'awesomeMap', ->
    # directive template: will be injected into controller ($element variable)
    template: "<svg></svg>"
    # will remplace hosting element
    replace: true
    # applicable as element and attribute
    restrict: 'EA'
    # here the "parameters" of your directive: can be parsed from HTML, or bound to parent scope (my example).
    scope:
      svgPath: '=?path'
    # controller
    controller: AwesomeMap

  class AwesomeMap

    # Controller dependencies: scope and HTML element
    @$inject: ['$scope', '$element']

    # Controller constructor: bind methods and attributes to current scope
    #
    # @param scope [Object] directive scope
    # @param element [Object] root element's HTML (angular.element)
    constructor: (@scope, element) -
      @snap = Snap(element[0])
      Snap.load(@scope.svgPath, (data) ->
        console.log "Loaded map in Map!">
        # do your stuff here !

您的指令需要在Angular的模块初始化之后加载(不要忘记在某处需要它),您只需在HTML中使用它.

<div data-ng-controller="AParentScope">
  My awesome map <awsome-map data-path="scopeAttribute"></awsome-map>

(使用Angular的CoffeeScript类是一个挑战,我很高兴找到别人尝试:))