所以有一段时间我一直在努力如何在不影响其他维度的情况下在dc.js中过滤dataTable。这似乎违反直觉，因为它与哪种交叉过滤器（dc.js后面的数据过滤器）最有效相抵触，但是我将解释为什么这可能是相关的。
假设我有一个人名年龄和性别的数据集。在我的一个数据表中，我只想显示男性。使用一个交叉过滤器，男性将不得不过滤所有其他数据表。
假设我还有一个饼图，其中列出了每个人姓名的首字母，并且我希望能够过滤出 M。我有一张男性用桌子，一张女性用桌子。我不希望这些表影响饼图的分布，但我希望能够单击饼图并过滤dc.js数据表。或多或少的一种单向过滤器。
dc.js数据表接受交叉过滤器尺寸。我通过如下扩展尺寸来解决这个问题。
function preFilter（dim，okey，oval）{
return {
top：function（x）{
var a1 = dim.top（x）.filter（function（v）{
return v [okey ] ===椭圆形；
}）；
返回a1；
}
};
}
这对我来说效果很好，希望它能对其他人有所帮助。
So for a while I had struggled with how to filter a dataTable in dc.js without affecting other dimensions. This seems counter-intuitive, as it goes against what crossfilter(the data filter behind dc.js) does best, but I'll explain why this can be relevant.
Suppose I have a dataset of peoples name age and gender. In one of my datatables, I only want to display males; using one crossfilter, I would be forced to filter all my other datatables by males.
Suppose I also have a pie chart that lists the first letter of each person's name, and I want to be able to filter on the 'M's. I have a table for males, and a table for females. I don't want these tables to affect the distribution of the pie chart, but I want to be able to click on the pie chart and have it filter the dc.js datatables. More or a less a one way filter.
What is the way to achieve this?
dc.js datatables accept crossfilter dimensions. I got around the problem by extending the dimension as follows.
function preFilter(dim,okey,oval){
return{
top:function(x){
var a1 = dim.top(x).filter(function(v){
return v[okey] === oval;
});
return a1;
}
};
}
This worked well for me, I hope it can help others.
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