禁用多选dc.js

Question

我正在尝试删除dc.js图表​​中启用的默认多选。 使用renderlet：

past_linechart
  .xUnits(dc.units.ordinal)
  .width(1000).height(300)
  .dimension(dayDim)
  .group(day_count)
  .filter(weekday[current_time.getDay()])                    .x(d3.scale.ordinal().domain(["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]))
  .y(d3.scale.linear())
  .xAxisLabel("Date")
  .yAxisLabel("People in campus on average")
  .transitionDuration(500)
  .centerBar(true)    
  .gap(65)
  .elasticY(true)
  .elasticX(true)
  .xAxisPadding(10)
   .renderlet(function(chart) {
               chart.selectAll('rect.bar').on("click", function (d) {
                   chart.filter(null);
                   chart.filter(d.key);
         })
      })
  .xAxis().tickFormat();`

让我对未定义的错误进行过滤。 并且还与事件监听器合作： on("filtered",function(chart,filter){ dc.events.trigger(function(){ chart.filterAll(); chart.filter(filter); }); 错误