后退导航未在主干 js 和 rails 3 应用程序中重新加载 jwplayer

我的应用程序是一个使用骨干的rails 3应用程序.js和jw播放器，用于播放视频播放列表。视频index_view将所有视频加载到 jw 播放器的播放列表中。当我离开索引页面时，我的问题就来了，比如说单个视频的show_view。当我单击浏览器的后退按钮时，当 jw 播放器尝试再次加载时出现错误。

Uncaught TypeError: Object #<Object> has no method 'setup'

我相信问题是模板没有加载播放器用来实例化的 html 元素。这是我目前的理论。如果你看index_view.js.coffee你会发现在render方法中，我使用 JQuery $(document).read -> 方法来加载播放器。如果我删除它，播放器不会加载，我看到同样的错误。

Uncaught TypeError: Object #<Object> has no method 'setup'

只需在不存在的 CSS ID 上调用 jwplayer 即可重现此错误，即jwplayer('non-existant-id').setup(...)会产生相同的错误。我对主干网很陌生，但我假设 JQuery document.ready 方法在初始加载索引页后不起作用。一旦我使用#路由，DOM 永远不会重新加载，因此当我导航回索引页面时，ID "my-video"尚不存在，因此调用jwplayer('my-video')会产生错误。有没有Backbone.ready的方法？ :)

所以这里有一些代码，如果你需要其他东西，我知道：

index.html.erb 视频的边栏视图

<div id="videos"></div>
<script type="text/javascript">
  $(function() {
    // Blog is the app name
    window.router = new SeehearmeWebapp.Routers.VideosRouter({videos: <%= @videos.to_json.html_safe -%>, users: <%= @users.to_json.html_safe -%>, questions: <%= @questions.to_json.html_safe -%>});
    Backbone.history.start();
  });
</script>

videos_router.js.coffee

class SeehearmeWebapp.Routers.VideosRouter extends Backbone.Router
  initialize: (options) ->
    @videos = new SeehearmeWebapp.Collections.VideosCollection()
    @videos.reset options.videos
    @users = new SeehearmeWebapp.Collections.UsersCollection()
    @users.reset options.users
    @playlist = []
    @questions = options.questions
    for i in [0..@videos.length-1]
      video = @videos.models[i]
      versions = video.attributes.versions[6]
      images = video.attributes.thumbnails[0]
      question = @questions[parseInt(video.attributes.question_id)-1]
      if !(question == undefined)
        title = question.text
      else
        title = ""
      if !(versions == undefined)
        creator_id = video.attributes.creator_id.toString()
        @playlist.push {file: versions.url, creator_id: creator_id, gender: @users.get(creator_id).attributes.gender, question: title ,  image: images.url}
  routes:
    "new"      : "newVideo"
    "index"    : "index"
    ":id/edit" : "edit"
    ":id"      : "show"
    ".*"        : "index"
  newVideo: ->
    @view = new SeehearmeWebapp.Views.Videos.NewView(collection: @videos)
    $("#videos").html(@view.render().el)
  index: ->
    @view = new SeehearmeWebapp.Views.Videos.IndexView(videos: @videos, users: @users, playlist: @playlist)
    $("#videos").html(@view.render().el)
  show: (id) ->
    video = @videos.get(id)
    @view = new SeehearmeWebapp.Views.Videos.ShowView(model: video)
    $("#videos").html(@view.render().el)
  edit: (id) ->
    video = @videos.get(id)
    @view = new SeehearmeWebapp.Views.Videos.EditView(model: video)
    $("#videos").html(@view.render().el)

index_view.js.coffee

SeehearmeWebapp.Views.Videos ||= {}
class SeehearmeWebapp.Views.Videos.IndexView extends Backbone.View
  template: JST["backbone/templates/videos/index"]
  playerHeight = '360'
  playerWidth = '640'
  defaultVersion = 0
  playlist = []
  initialize: () ->
    @options.videos.bind('reset', @addAll)
    playlist = @options.playlist
  addAll: () =>
    @options.videos.each(@addOne)
  addOne: (video) =>
    view = new SeehearmeWebapp.Views.Videos.VideoView({model : video})
    @$("tbody").append(view.render().el)
  render: =>
    $(@el).html(@template(videos: @options.videos.toJSON() ))
    @addAll()
    $(document).ready ->
      player = jwplayer('my-video')
      player.setup({playlist: playlist,  width: playerWidth, height: playerHeight, skin: "/jwplayer/skins/six/six.xml"})
    return this

index.jst.ejs

<div class="video-container">
    <div class="row gender-toggle-row">
        <div class="gender-toggle-label span1">Show Me: </div>
        <div class="btn-group gender-dropdown-group">
            <button class="btn btn-extra-large gender-dropdown gender-dropdown-display">Women and Men</button>
            <button class="btn btn-extra-large dropdown-toggle gender-dropdown" data-toggle="dropdown">
                <img src="assets/down-arrow.png" />
            </button>
            <ul class="dropdown-menu gender-dropdown-menu">
                <li><a class="gender-toggle-element" href="#">Women</a></li>
                <li><a class="gender-toggle-element" href="#">Men</a></li>
                <li><a class="gender-toggle-element" href="#">Women and Men</a></li>
            </ul>
        </div>
    </div>
    <div class="cinema-ribbon-sides"></div>
    <div class="cinema-ribbon"><h2 id="question-text" class="white centered-text">seehear.me</h2></div>
    <div id='my-video'></div>
    <div class="cinema-shadow"></div>
    <div class="cinema-controls">
        <a id="prev-video" class="cinema-prev"></a>
        <a href="#/71" role="button" class="meet"><div class="meet-btn-text">meet her</div></a>
        <a id="next-video" class="cinema-next"></a>
    </div>
</div>
<br />

show_view.js.coffee

SeehearmeWebapp.Views.Videos ||= {}
class SeehearmeWebapp.Views.Videos.ShowView extends Backbone.View
  template: JST["backbone/templates/videos/show"]
  render: ->
    $(@el).html(@template(@model.toJSON() ))
    return this

show_view.js.coffee

<h1>THIS IS A VIDEO</h1>
<a href="#/">Back</a>

谢谢！

当您呈现主干视图并以这种方式将其添加到页面时：

$("#videos").html(@view.render().el)

您正在呈现到尚未添加到页面的 DOM 元素。由于您尝试在 render() 中设置 jwplayer，jwplayer 可能找不到该元素。

如果先将视图添加到页面，然后呈现，则它可能会起作用。

$("#videos").html(@view.el)
@view.render()

现在，当您渲染模板时，它实际上在jwplayer尝试查找该元素之前就在页面上。

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