javascript – 为什么音频事件不是用BackboneJS触发的,而是其他的？

我不明白为什么点击事件是正常的,但不是timeupdate.

没有任何事件从< audio>开始,我尝试了canplay,播放,暂停,timeupdate,…
如果我在模板中显示控件,如果我点击播放器,则会点击.audio事件.

var PlayerView = Backbone.View.extend({
    tagName : 'div',

    template: _.template($('#player-template').html()),

    initialize: function() {
        this.$el.html(this.template(this.model.toJSON()));
    }

    events: {
        'timeupdate .audio': 'onTimeUpdate',
        'click .btn_play': 'onClickPlay',
        'click .btn_pause': 'onClickPause'
    },

    onTimeUpdate: function () {
        console.log('player ' + this.model.get('id') + ' : event = onTimeUpdate');
    },

    onClickPlay: function () {
        console.log('player ' + this.model.get('id') + ' : event = onClickPlay');
    },

    onClickPause: function () {
        console.log('player ' + this.model.get('id') + ' : event = onClickPause');
    },

});


$(function(){
    var model = new PlayerModel({'id' : 1});
    var view = new PlayerView({'model' : model});
    $("#players").append(view.el);
})

模板：

<script type="text/template" id="player-template">
    <div id="player<%= id %>" class="player">
        <audio class="audio">
          <source src="<%= track_url %>" type="audio/mp3" />
        </audio>
        <div class="control">
            <button class="btn_play">Play</button>
            <button class="btn_pause">Pause</button>
        </div>
    </div>
</script>

解决方法:

Backbone在内部转换事件对象和binds the events by delegation.这意味着

events: {
        'timeupdate .audio': 'onTimeUpdate',
        'click .btn_play': 'onClickPlay'
}

结束为

this.$el.delegate('.audio','timeupdate', this.onTimeUpdate);
this.$el.delegate('.btn_play','click', this.onClickPlay);

但有一个问题：

Uses event delegation for efficiency. […] This only works for
delegate-able events: not focus, blur, and not change, submit, and
reset in Internet Explorer.

并且看起来音频事件不是委托能的.

但是,直接设置回调确实有效,例如,您可以替换初始化函数

initialize: function() {
    this.$el.html(this.template(this.model.toJSON()));
    _.bindAll(this,'onTimeUpdate');
    this.$('.audio').on('timeupdate', this.onTimeUpdate);
}

标签：javascript,backbone-js,html5-audio
来源： https://codeday.me/bug/20191005/1856515.html