D3.js scaleOrdinal ordinal() Function

Last Updated : 23 Sep, 2020

The ordinal() function in d3.js library is used to return a value from the specified range on giving an input corresponding to the specified domain.

Syntax:

ordinal(value);

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

Value: This parameter accepts a value from the given domain.

Return Value: This function return a value from the range corresponding to the given input.

Below given are a few examples of the function given above.

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> 
        // Creating the Ordinal scale. 
        var ordinal = d3.scaleThreshold() 
          
            // Setting domain for the scale 
            .domain([0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8]) 
          
            // Setting the range for the scale. 
            .range([10, 20, 30, 40, 50, 60, 70, 80, 90]); 
        console.log("ordinal(0.1)", ordinal(0.1)); 
        console.log("ordinal(0.2)", ordinal(0.2)); 
        console.log("ordinal(0.3)", ordinal(0.3)); 
        console.log("ordinal(0.4)", ordinal(0.4)); 
        console.log("ordinal(0.5)", ordinal(0.5)); 
        console.log("ordinal(0.6)", ordinal(0.6)); 
        console.log("ordinal(0.7)", ordinal(0.7)); 
        console.log("ordinal(0.8)", ordinal(0.8)); 
    </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> 
        // Creating the Ordinal scale. 
        var ordinal = d3.scaleThreshold() 
  
            // Setting domain for the scale 
            .domain([1, 2, 3, 4, 5, 6, 7, 8]) 
          
            // Setting the range for the scale. 
            .range(["one", "two", "three", "four", 
                50, 60, 70, 80, 90]); 
        console.log("ordinal(1)", ordinal(1)); 
        console.log("ordinal(2)", ordinal(2)); 
        console.log("ordinal(3)", ordinal(3)); 
        console.log("ordinal(4)", ordinal(4)); 
    </script> 
</body> 
  
</html> 