Question

    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">

    </head>

    <body>

    <div id = "selectbox"> </div>
    <div id = "chart1"> </div>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.5.0/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crossfilter/1.3.12/crossfilter.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dc/3.0.6/dc.min.js"></script>



 <script>   
    var facts = crossfilter([
    {"Period":"Jan-18","Department":"Dept 1","Percentage":0.2098},
    {"Period":"Feb-18","Department":"Dept 1","Percentage":0.6058},
    {"Period":"Mar-18","Department":"Dept 1","Percentage":0.691},
    {"Period":"Jan-18","Department":"Dept 2","Percentage":0.2705},
    {"Period":"Feb-18","Department":"Dept 2","Percentage":0.4113},
    {"Period":"Mar-18","Department":"Dept 2","Percentage":0.3698},
    {"Period":"Jan-18","Department":"Dept 3","Percentage":0.3239},
    {"Period":"Feb-18","Department":"Dept 3","Percentage":0.4638},
    {"Period":"Mar-18","Department":"Dept 3","Percentage":0.4036},
    {"Period":"Jan-18","Department":"Dept 4","Percentage":0.8288},
    {"Period":"Feb-18","Department":"Dept 4","Percentage":0.0809},
    {"Period":"Mar-18","Department":"Dept 4","Percentage":0.9152},
    {"Period":"Jan-18","Department":"All","Percentage":0.6104},
    {"Period":"Feb-18","Department":"All","Percentage":0.3348},
    {"Period":"Mar-18","Department":"All","Percentage":0.8257},
    ])

    var PeriodDimension = facts.dimension( function (d) {return d.Period} );
    var DeptDimension = facts.dimension( function (d) {return d.Department} );

    dc.selectMenu("#selectbox")
        .dimension(DeptDimension)
        .group(DeptDimension.group())
        .promptText("removethisline")
        .controlsUseVisibility(true);

     dc.renderAll();
 </script>

</body>

JS Fiddle Here

两个问题

1）如果您在JSFiddle中注意到，我们将在下拉列表中获取键和值。我们只需要键，即下拉菜单中只需要All，Dept 1，Dept 2等。

2）由于我已经有一个内置数据的“全部”选项，如何从下拉菜单中删除hintText值？

Answer 1

有点buried in the documentation，但根示例显示了如何使用Optional<String>来设置选项文本，就像这样：
```
.title()
```
第一个元素似乎在其中进行了硬编码，因此我会听.title(kv => kv.key)事件并使用attribute selector选择带有空白的pretransition值并将其删除：
```
option
```

注意：如果您的行不是完全不同的，则可能会遇到其他图表无法正确加总的情况。

Fork of your fiddle.

Answer 2

为了后代，使用CboxMenu对我来说上述答案不起作用，但这确实可行：

cbox.filter("Dept 1")
.on('pretransition', function() {
  cbox.selectAll('li:not(.dc-cbox-item)').remove();
})

设置适当的dc.selectMenu下拉选项

2 个答案: