VTable Usage Issue: How to insert sparklines in table?

Question Description

A mini-line chart reflecting the dynamics of a set of data needs to be displayed in a cell in a column of the table. How to achieve this effect in VTable?

Solution

In VTable, you can specify the column to be a sparkline type cell by setting cellType to sparkline in columns.

sparkLine data The data specified by the sparkline type cell can be an array of numbers (the number will default to y field in the sparkline, and x field will be automatically filled in order), or it can be an array of x, y objects:

// ......
{
  lineData1: [10, 20, 30, 40, 60, 30, 10],
  lineData2: [
    { x: 0, y: 10 },
    { x: 1, y: 40 },
    { x: 2, y: 60 },
    { x: 3, y: 30 },
    { x: 4, y: 20 },
    { x: 5, y: 20 },
    { x: 6, y: 60 },
    { x: 7, y: 50 },
    { x: 8, y: 70 }
  ]
}

sparkline style In columns, in addition to configuring the cellType as sparkline, you can also configure the sparkline style spec through sparklineSpec (if not configured using default style), and the spec rules refer to VChart:

const baseSpec: TYPES.SparklineSpec = {
  type: 'line',
  xField: {
    field: 'x',
    domain: [0, 1, 2, 3, 4, 5, 6, 7, 8]
  },
  yField: {
    field: 'y',
    domain: [0, 80]
  },
  smooth: true,
  pointShowRule: 'all',
  line: {
    style: {
      stroke: '#2E62F1',
      strokeWidth: 2
    }
  },
  point: {
    hover: {
      stroke: 'blue',
      strokeWidth: 1,
      fill: 'red',
      shape: 'circle',
      size: 4
    },
    style: {
      stroke: 'red',
      strokeWidth: 1,
      fill: 'yellow',
      shape: 'circle',
      size: 2
    }
  },
  crosshair: {
    style: {
      stroke: 'gray',
      strokeWidth: 1
    }
  }
};

// option: ......
columns: [
  {
    field: 'lineData2',
    title: 'spark line2',
    cellType: 'sparkline',
    width: 250,
    sparklineSpec: baseSpec
  }
];

type: the type of sparkline, currently only supports line
xField: x-axis dimension information, configure the data field for x-axis mapping, x-axis data range, etc.
yField: y-axis dimension information, configure the data field for y-axis mapping, y-axis data range, etc.
smooth: whether the polyline is displayed smoothly
pointShowRule: The display rule of the vertex, which supports the following configurations:
- all: show all points
- none: do not display points
- isolatedPoint: Indicates that only isolated points are displayed (the front and rear values are empty)
line: polyline style
point: style of vertex
crosshair: interactively displayed crosshair style

Code Example

const baseSpec: TYPES.SparklineSpec = {
  type: 'line',
  xField: {
    field: 'x',
    domain: [0, 1, 2, 3, 4, 5, 6, 7, 8]
  },
  yField: {
    field: 'y',
    domain: [0, 80]
  },
  smooth: true,
  pointShowRule: 'all',
  line: {
    style: {
      stroke: '#2E62F1',
      strokeWidth: 2
    }
  },
  point: {
    hover: {
      stroke: 'blue',
      strokeWidth: 1,
      fill: 'red',
      shape: 'circle',
      size: 4
    },
    style: {
      stroke: 'red',
      strokeWidth: 1,
      fill: 'yellow',
      shape: 'circle',
      size: 2
    }
  },
  crosshair: {
    style: {
      stroke: 'gray',
      strokeWidth: 1
    }
  }
};

const records = generateRecords(10);

const columns = [
  {
    field: 'id',
    title: 'ID',
    width: 80
  },
  {
    field: 'lineData1',
    title: 'spark line1',
    cellType: 'sparkline',
    width: 250
  },
  {
    field: 'lineData2',
    title: 'spark line2',
    cellType: 'sparkline',
    width: 250,
    sparklineSpec: baseSpec
  }
];
const option: TYPES.ListTableConstructorOptions = {
  records,
  columns
};

Results

Online demo