Vega 不按降序排序

问题描述

我正在构建一个 Vega 模板并试图将排序绑定到一个下拉框。我创建了一个带有下拉框的信号，下拉框中的值是对我的数据进行排序的属性。我在 window 属性上添加了一个绑定到该信号的 data 转换。该转换指定按 descending 顺序排序。这是排序，但不是按 descending 顺序。我错过了什么吗？如何让可视化按 descending 顺序排序？ 这是 visualization 的链接。

  "signals": [
    
    {
      "name": "sortby","value": "category","bind": {
        "input": "select","options": ["category","amount"]
      }
    },{
      "name": "tooltip","value": {},"on": [
        {"events": "rect:mouSEOver","update": "datum"},{"events": "rect:mouSEOut","update": "{}"}
      ]
    }  
  ],"data": [
    {
      "name": "table","values": [
        {"category": "A","amount": 28,"test": 9},{"category": "B","amount": 55,"test": 8},{"category": "C","amount": 43,"test": 7},{"category": "D","amount": 91,"test": 6},{"category": "E","amount": 81,"test": 5},{"category": "F","amount": 53,"test": 4},{"category": "G","amount": 19,"test": 3},{"category": "H","amount": 87,"test": 2}
      ],"transform": [
       {
         "type": "window","sort": {
           "field": {"signal": "sortby","order": "descending"}
         },"ops": ["rank"],"fields": [null],"as": ["rank"]
       }
      ]
    }
  ],

解决方法

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