NVD3.js - 如何向堆积图中的每个条形添加条形文本？

Question

我在 NVD3/AngularJS 中创建了一个多条形图。我想在每个矩形条内显示文本及其值，如下面的 JSON 所示。

如何在每个条形图中显示文本值？

NVD3 图表定义

multiBarChart: {
        options: function(){
          return {
            chart: {
              type: 'multiBarChart',
              stacked: true,
              x: function(d){return d.x;},
              y: function(d){return d.y;},
              text: function(d){return d.x;},
              showLabels: true,
              showLegend: false,
              transitionDuration: 500,
              forceX: ["Team", "Meeting", "Phase", "Source"],
              xAxis: {
                axisLabel: 'Category',
                axisLabelDistance: -8
              },
              yAxis: {
                axisLabel: 'Number Of Action Items',
              }
            }
          }
        },
        data: categoryChartData
      }

JSON 数据(categoryChartData)

  [ 
                                {"values" : [
                                    {
                                        "y" :10,
                                        "x" : "Team"
                                    }, {
                                        "y" : 0,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :0,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 0,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Team1"
                                },

                                {"values" : [
                                    {
                                        "y" :5,
                                        "x" : "Team"
                                    }, {
                                        "y" : 0,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :0,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 0,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Team2"
                                },
                                    {"values" : [
                                    {
                                        "y" :0,
                                        "x" : "Team"
                                    }, {
                                        "y" : 7,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :0,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 0,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Meeting1"
                                },
                                    {"values" : [
                                    {
                                        "y" :0,
                                        "x" : "Team"
                                    }, {
                                        "y" : 3,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :0,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 0,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Meeting2"
                                },
                                {"values" : [
                                    {
                                        "y" :0,
                                        "x" : "Team"
                                    }, {
                                        "y" : 0,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :9,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 0,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Phase1"
                                },
                                {"values" : [
                                    {
                                        "y" :0,
                                        "x" : "Team"
                                    }, {
                                        "y" : 0,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :5,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 0,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Phase1"
                                },
                                {"values" : [
                                    {
                                        "y" :0,
                                        "x" : "Team"
                                    }, {
                                        "y" : 0,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :0,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 2,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Internal"
                                },
                                {"values" : [
                                    {
                                        "y" :0,
                                        "x" : "Team"
                                    }, {
                                        "y" : 0,
                                        "x" : "Meeting"
                                    },
                                    {
                                        "y" :0,
                                        "x" : "Phase"
                                    }, {
                                        "y" : 1,
                                        "x" : "Source"
                                    }
                                    ],
                                    "key" : "Customer"
                                }


                                ];

Answer 1

由于动画堆叠条形图的一些复杂性，Angular-nvd3 本身不会对多条形图执行此操作，但它会对离散条形图执行此操作，如 How to display values in Stacked Multi-bar chart - nvd3 Graphs探索过。然而，在对该问题的回答的更新中，@Topicus 链接到 a gist they wrote这可以实现您正在寻找的目标。

我根据您的情况调整了要点；你可以在 this Plunker 中看到结果。如果标签显示有点不稳定，您可以稍微调整一下格式。关键是动画完成后需要附加标签，因此我设置的超时等于(也可以略大于)transitionDuration 图表属性的值。我还删除了所有零值，这样它们就不会掩盖非零值。

$scope.options = {
  chart: {
    type: 'multiBarChart',
    height: 500,
    transitionDuration: 500,
    ...
  }
};

$scope.data...

$timeout(function () {
  d3.selectAll('.nv-multibar .nv-group').each(function(group){
    var g = d3.select(this);
  
    // Remove previous labels if there is any
    g.selectAll('text').remove(); 
    g.selectAll('.nv-bar').each(function(bar) {
      var b = d3.select(this);
      var barWidth = b.attr('width');
      var barHeight = b.attr('height');

      g.append('text')
        // Transforms shift the origin point then the x and y of the bar
        // is altered by this transform. In order to align the labels
        // we need to apply this transform to those.
        .attr('transform', b.attr('transform'))
        .text(function() {
          // No decimals format and eliminate zero values
          if (bar.y === 0) {
            return;
          }
          return parseFloat(bar.y).toFixed(0);
        })
        .attr('y', function() {
          // Center label vertically
          var height = this.getBBox().height;
          return parseFloat(b.attr('y')) + 15; // 15 is the label's margin from the top of bar
        })
        .attr('x', function() {
          // Center label horizontally
          var width = this.getBBox().width;
          return parseFloat(b.attr('x')) + (parseFloat(barWidth) / 2) - (width / 2);
        })
        .style("stroke","black")
        .attr('class', 'bar-values');
    });
  });
}, 500);