D3.js band.rangeRound() Function

Namachila October 31, 2025

0 0 1 minute read

The band.rangeRound() function is used to set the range of the scale to the specified two-element array along with this it also set the round to true.

Syntax:

band.rangeRound([range])

Parameters: This function accepts single parameters as given above and described below:

range: This parameter accepts a two-element array of numbers.

Return Values: This function does not return anything.

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

Example 1:

<!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 band scale with 
    // specified domain and range. 
        var band = d3.scaleBand() 
                    .domain([10, 20, 30, 40, 50]) 
                    .range([0, 1]); 
  
        console.log("Without rangeRound function:"); 
        console.log("band(10): ", band(10)); 
        console.log("band(20): ", band(20)); 
        
        console.log("With rangeRound function:"); 
        
        var band = d3.scaleBand() 
                    .domain([10, 20, 30, 40, 50]) 
                    .rangeRound([0, 1]); 
        
        console.log("band(10): ", band(10)); 
        console.log("band(20): ", band(20)); 
    </script>  
</body>  
</html>

Output:

Example 2:

<!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 band scale with 
     // specified domain and range. 
        var band = d3.scaleBand() 
                    .domain([1, 2, 3, 4]) 
        // When range is in string 
                    .range(["0", "10"]); 
        console.log("Without rangeRound function:"); 
        console.log("band(1): ", band(1)); 
        console.log("band(2): ", band(2)); 
        
        console.log("With rangeRound function:"); 
        
        var band = d3.scaleBand() 
                    .domain([1, 2, 3, 4, 5]) 
                    .rangeRound(["0", "10"]); 
        
        console.log("band(1): ", band(1)); 
        console.log("band(2): ", band(2)); 
    </script>  
</body>  
</html>

Output:

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