javascript - JQuery UI resizable Resize 事件绑定(bind)/on resize 事件到 Backbone View

Question

我有一个 View ，不是窗口的大小，也不是窗口本身，当它调整大小时，我想比较调整大小的开始值和结束值。然而，JQ-UI 的 resize ui 对象只包含以前的状态，而不是原始状态，所以它只是按像素获取变化(尽管我认为这是因为我将代码放在调整大小函数中，而不是结束函数中，但是这不是真正的问题，因为一旦我知道如何将 var 返回到 Backbone View 本身，我就可以解决它)。如何将调整大小内的信息返回到主干 View ？ self 是全局 window 对象，this 是 this.el 选择器的 JQuery 结果。

define([ ... ], function( ... ){
  return Backbone.View.extend({
    // I also tried to use the event handlers from backbone
    events : {
      'resize' : 'info'
    },
    initialize: function(options){
      if (options) { ... }
        this.el = '#measure-rep-c55';
      }
      //Dispatch listeners
      ...
      //Binding
      this.model.bind('change', _.bind(this.render, this));
      $(this.el).on('resize', this.info);  // Here I am trying to attach the listener here according the API

      this.render();
    },
    info: function(){
      console.log('in info')
    },
    render: function(){ 
      ... //template and other stuff

      // JQ-UI resizable
      $(this.el).resizable({ 
        aspectRatio: true,
        start: function(e, ui) {
            // alert('resizing started');
        },
        resize: function( event, ui ) {
          // in here self = window
          // and this is the JQuery object
          var oldW = ui.originalSize.width;
          var newW = ui.size.width;
          var deltaWidth = newW - oldW;
          var deltaRatio = deltaWidth/oldW;
          //HOW TO SEND info (in this case var deltaRatio) back to the backbone view
          //I tried getting to the function info() so that I could access the View itself from there
        },
        stop: function(e, ui) {
            // alert('resizing stopped');
        }
      });
    },
  });
});

Answer 1

不要在可调整大小的调用中创建监听器，使用事件哈希来监听更改，然后您可以直接从回调访问您的 View 。

events : {
  'resizestart' : 'start',
  'resizestop' : 'stop',
  'resize' : 'resize'
},

render: function(){ 
  ... //template and other stuff

  // JQ-UI resizable
  this.$el.resizable({ 
    aspectRatio: true
  });
},

start: function(e, ui) {
        // alert('resizing started');
},
resize: function( event, ui ) {
      // this is the View
      var oldW = ui.originalSize.width;
      var newW = ui.size.width;
      var deltaWidth = newW - oldW;
      var deltaRatio = deltaWidth/oldW;
 },
 stop: function(e, ui) {
    // alert('resizing stopped');
 }