How to filter record by custom value from any dimension in dc.js?

Question

How to remove custom records from any dimension. In the below case how do I filter only category 'S' and allow rest of them in dimension ?

Example

let data = [
{category:'A',value:10},
{category:'B',value:11},
{category:'S',value:12},
{category:'A',value:14},
{category:'B',value:12},
]

let ndx = crossfilter(data);

let dim= ndx.dimension(function(d){
    if(d.category != "S") return d.category;
})

This above code runs into loop and the application crashes. I don't want to create separate data for this dimension rather link it with other cross filters.

Answer 1

I guess its pretty simple, I did little research after posting the question.

Just manipulate the group parameter being passed to the chart. The code goes something like this.

Since I am trying to remove the value by key lets first write a function for further uses as well.

function removeByKey(source_group, value) {
    return {
        all: function() {
            return source_group.all().filter(function(d) {
                return d.key != value;
            });
        }
    };
}

Once this is done the place where you call the group method for the charts call this method. The first parameter of removeByKey method is the group itself the second is the key value which is supposed to be removed from the chart.

 chart
   .dimension(dimension_data)
   .group(removeByKey(dimension_data_group, 'S'))

Thanks :)