javascript-d3How do I add a label to the Y axis of a D3.js chart?

To add a label to the Y axis of a D3.js chart, you need to use the axisLeft method. This method takes an optional argument for the label.

For example:

const yAxis = d3.axisLeft()
  .scale(yScale)
  .tickFormat(d3.format('.2s'))
  .tickSize(-width)
  .tickPadding(10)
  .tickValues(yTicks)
  .tickSizeOuter(0)
  .tickFormat(d3.format('.2s'))
  .tickSizeInner(0)
  .tickSize(0)
  .tickPadding(10)
  .tickSizeOuter(0)
  .tickSizeInner(0)
  .tickLabel('Label');

This will add the label 'Label' to the Y axis.

Code explanation

• d3.axisLeft() - creates the Y axis
• .scale(yScale) - sets the scale for the Y axis
• .tickFormat(d3.format('.2s')) - sets the format for the ticks
• .tickSize(-width) - sets the size of the ticks
• .tickPadding(10) - sets the padding of the ticks
• .tickValues(yTicks) - sets the values for the ticks
• .tickSizeOuter(0) - sets the outer size of the ticks
• .tickFormat(d3.format('.2s')) - sets the format for the ticks
• .tickSizeInner(0) - sets the inner size of the ticks
• .tickSize(0) - sets the size of the ticks
• .tickPadding(10) - sets the padding of the ticks
• .tickSizeOuter(0) - sets the outer size of the ticks
• .tickSizeInner(0) - sets the inner size of the ticks
• .tickLabel('Label') - sets the label of the Y axis

Helpful links

• D3.js Documentation
• AxisLeft Method

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