D3.js log.domain() Function

Last Updated : 26 Aug, 2020

The log.domain() function is used to set the scale’s domain to the specified array of numbers. The array specified here must contain two or more than two elements. By default, the domain is [1,10].

Syntax:

log.domain([domain]);

Parameters: This function accepts single parameter as mentioned above and described below.

[domain]: This is an array that takes two or more values that specifies the domain.

Return Values: This function does not return any value.

Below examples illustrate the log.domain() function in D3.js:

Example 1:

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" path1tent= 
        "width=device-width, initial-scale=1.0"/> 
    <script src="https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        var log = d3.scaleLog() 
          
            // Setting domain for the scale. 
            // Domain can not be less than one. 
            .domain([1, 20]) 
            .range(["1", "2", "3", "4", "5"]); 
        console.log("The domain of this is [1,20]: "); 
        console.log("log(0): " + log(0)); 
        console.log("log(1): " + log(1)); 
        console.log("log(2): " + log(2)); 
    </script> 
</body> 
  
</html> 

Output:

Example 2:

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" path1tent= 
        "width=device-width,initial-scale=1.0" /> 
  
    <script src="https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        var log = d3.scaleLog() 
          
            // Setting domain for the scale. 
            .domain([-1, +1]) 
            .range(["1", "2", "3", "4", "5"]); 
        console.log("When domain is less than one."); 
        console.log("The domain of this is [-1,+1]: "); 
        console.log("log(0): " + log(0)); 
        console.log("log(1): " + log(1)); 
        console.log("log(0.5): " + log(0.5)); 
    </script> 
</body> 
  
</html> 