The tooltip in nvd3 is displaying the index instead of the label

I'm encountering an NVD3 tooltip issue with my multichart (multiline chart). The XAxis labels are set as JAN, FEB, MAR... DEC. However, when I hover over the graph, it displays 0, 1, 2, 3... 11 as the tooltip title instead of the month names. Here is the code snippet for my chart options:

{
  "chart": {
    "type": "multiChart",
    "height": 400,
    "interpolate": "linear",
    "showLegend": false,
    "margin": {
      "top": 50,
      "right": 100,
      "bottom": 60,
      "left": 100
    },
    "reduceXTicks": false,
    "useVoronoi": false,
    "useInteractiveGuideline": true,
    "duration": 500,
    "xAxis": {
      "axisLabel": "MONTHLY",
      "tickPadding": 10,
      "tickSize": 1,
      "tickValues": [
        0,
        1,
        2,
        3,
        4,
        5,
        6
      ]
    },
    "yAxis1": {
      "axisLabel": "Left",
      "tickPadding": 10
    },
    "yAxis2": {
      "axisLabel": "Right",
      "width": 60,
      "tickPadding": 10
    },
    "yDomain1": [
      0,
      5
    ],
    "yDomain2": [
      0,
      100
    ]
  }
}

The problem can be seen in the images below: Image 1 (Showing 1 instead of FEB), Image 2 (Showing 2 instead of MAR).

If anyone could help identify the issue, it would be greatly appreciated.

Thank you in advance.

javascriptangularjsd3.jsnvd3.js

Answer №1

If you want to customize the label of the header, one way is to utilize the 

interactiveLayer.tooltip.headerFormatter
method. Here's an example:

chart.interactiveLayer.tooltip.headerFormatter(data => {
      if (typeof data === 'string') return data
    })

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