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D3.js axis.tickFormat() Function
  • Last Updated : 05 Aug, 2020

The d3.axis.tickFormat() Function in D3.js is used to control which ticks are labelled. This function is used to implement your own tick format function.

Syntax:

axis.tickFormat([format])

Parameters: This function accepts the following parameter.

  • format: These parameters are format to set the tick format function.

Return Value: This function returns the currently set tick format function, which defaults to null.

Below programs illustrate the d3.axis.tickFormat() function in D3.js:



Example 1:




<!DOCTYPE html> 
<html
  
<head
    <title
        D3.js | D3.axis.tickFormat() Function 
    </title
    <script type="text/javascript"
        src="https://d3js.org/d3.v4.min.js"
    </script
      
    <style
        svg text { 
            fill: green; 
            font: 15px sans-serif; 
            text-anchor: center; 
        
    </style
</head
  
<body
    <script
        var width = 400, height = 400; 
        var svg = d3.select("body") 
            .append("svg") 
            .attr("width", width) 
            .attr("height", height); 
  
        var yscale = d3.scaleLinear() 
            .domain([0, 1]) 
            .range([height - 50, 0]); 
  
        var y_axis = d3.axisLeft().scale(yscale)
        .tickValues([0, .2, .5, .70, 1])
        .tickFormat((d, i) => ['a', 'e', 'i', 'o', 'u'][i]); 
  
  
        svg.append("g") 
            .attr("transform", "translate(100, 20)") 
            .call(y_axis) 
    </script>
</body
</html>

Output:

Example 2:




<!DOCTYPE html> 
<html
  
<head
    <title
        D3.js | D3.axis.tickFormat() Function 
    </title
    <script type="text/javascript"
        src="https://d3js.org/d3.v4.min.js"
    </script
      
    <style
        svg text { 
            fill: green; 
            font: 15px sans-serif; 
            text-anchor: center; 
        
    </style
</head
  
<body
    <script
        var width = 600, height = 400; 
        var svg = d3.select("body") 
            .append("svg") 
            .attr("width", width) 
            .attr("height", height); 
  
        var xscale = d3.scaleLinear() 
            .domain([0, 10]) 
            .range([0, width - 100]); 
  
        var x_axis = d3.axisBottom(xscale).ticks(4)
        .tickFormat(x => `(${x.toFixed(1)})`); 
  
        var xAxisTranslate = height / 2; 
  
        svg.append("g") 
            .attr("transform", "translate(50, " 
            + xAxisTranslate + ")") 
            .call(x_axis) 
    </script
</body
</html>

Output:

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