D3.js axis.tickFormat() Function

0 0 1 minute read

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>