c3 类别刻度格式

Question

我有一个 c3 条形图类别。我想格式化类别标签以便能够将其截断到一定长度。但我想不通。

这是图形定义：

var chart;
chart = c3.generate({
                    padding: {
                        top: 20,
                        bottom: 20

                    },
                    data: {

                        columns: [
                                  ["Listeners",4,2,0],
                                  ["Listens",4,2,0]],
                        type: 'bar',
                        groups:[["Listeners", "Listens"]]
                    },
                    axis: {
                        x: {
                            type: 'category',
                            categories: ["012345678890", "012345678890", "012345678890"],
                            
                        }
                    },
                    bar: {
                        width: {
                            ratio: 0.5 // this makes bar width 50% of length between ticks
                        }
                    },
                    legend: {
                        show: false
                    }
                });

<link href="https://raw.githubusercontent.com/c3js/c3/0.4.11/c3.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://raw.githubusercontent.com/c3js/c3/0.4.11/c3.js"></script>

<div id="chart" class="c3" style="max-height: 280px; position: relative;"></div>

我尝试添加它以格式化 x 轴定义内的刻度，但它抱怨图表未定义

tick:{format:function (x) { return chart.categories()[x].substring(0, 10); }}

提前致谢！

Answer 1

当然，您只需声明没有值的变量var chart; 是未定义的。 尝试在函数c3.generate() 之前创建图表配置，然后将配置作为参数传递。

var config = {
        padding : {
            top : 20,
            bottom : 20
        },
        data : {
            columns : [ [ "Listeners", 4, 2, 0 ], [ "Listens", 4, 2, 0 ] ],
            type : 'bar',
            groups : [ [ "Listeners", "Listens" ] ]
        },
        axis : {
            x : {
                type: 'category',
                categories: ["012345678890", "012345678890","012345678890"],
            }
        },
        bar : {
            width : {
                ratio : 0.5
            }
        },
        legend : {
            show : false
        }
    };

    config.axis.x.tick = {
        format : function(x) {
            return config.axis.x.categories[x].substring(0,10)
        }
    };

    var chart = c3.generate(config);

Answer 2

在您的代码中，您在 x 轴定义中命名了类别，我不确定您为什么不只更改标签？

** 示例 **

var chart;
chart = c3.generate({
                    padding: {
                        top: 20,
                        bottom: 20

                    },
                    data: {

                        columns: [
                                  ["Listeners",4,2,0],
                                  ["Listens",4,2,0]],
                        type: 'bar',
                        groups:[["Listeners", "Listens"]]
                    },
                    axis: {
                        x: {
                            type: 'category',
                            _comment: "THIS IS WHERE YOU SET YOUR CATEGORY LABELS",
                            categories: ["Label1", "Label2", "Label3"],
                            
                        }
                    },
                    bar: {
                        width: {
                            ratio: 0.5 // this makes bar width 50% of length between ticks
                        }
                    },
                    legend: {
                        show: false
                    }
                });

<link href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.11/c3.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.4.11/c3.min.js"></script>

<div id="chart" class="c3" style="max-height: 280px; position: relative;"></div>