D3.js axisLeft() Function

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Axes can be drawn using built-in D3 functions. It is made of Lines, Ticks and Labels. Axis API can be configured using the following script.

<script src = "https://d3js.org/d3-axis.v1.min.js"></script>

The d3.axisLeft() function in D3.js is used to create a left vertical axis. This function will construct a new left-oriented axis generator for the given scale, with empty tick arguments, a tick size of 6 and padding of 3.

Syntax:

d3.axisLeft( scale )

Parameters: This function accepts only one parameter as mentioned above and described below:

scale: This parameter holds the used scale.

Return Value: This function returns a created left vertical axis.

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

Example 1:

HTML

<html> 
  
<head> 
    <title> 
        D3.js d3.axisLeft() Function 
    </title> 
  
    <script type="text/javascript" 
        src="https://d3js.org/d3.v4.min.js"> 
    </script> 
</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, 100]) 
            .range([height - 50, 0]); 
  
        var y_axis = d3.axisLeft(yscale); 
  
        svg.append("g") 
            .attr("transform", "translate(100, 10)") 
            .call(y_axis) 
    </script> 
</body> 
  
</html>

Output:

Example 2:

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        D3.js d3.axisLeft() 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 data = [10, 12, 14, 16, 18, 20]; 
        var svg = d3.select("body") 
            .append("svg") 
            .attr("width", width) 
            .attr("height", height); 
  
        var yscale = d3.scaleLinear() 
            .domain([d3.min(data), d3.max(data)]) 
            .range([height - 50, 0]); 
  
        var y_axis = d3.axisLeft(yscale); 
  
        svg.append("g") 
            .attr("transform", "translate(100, 20)") 
            .call(y_axis) 
    </script> 
</body> 
  
</html>

Output:

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