D3.js threshold.invertExtent() Function

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The threshold.invertExtent() function in d3.js is used to return the extent of the values in the specified domain.

Syntax:

threshold.invertExtent(value);

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

value: This parameter takes a value from the given range.

Return Values: This function returns a value from the domain corresponding to the given input value.

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>  
    <script src= 
    "https://d3js.org/d3-color.v1.min.js"> 
    </script>  
    <script src= 
    "https://d3js.org/d3-interpolate.v1.min.js"> 
    </script>  
    <script src= 
    "https://d3js.org/d3-scale-chromatic.v1.min.js"> 
    </script>  
</head>  
<body>  
    <h2 style="color:green;">Geeks for zambiatek</h2> 
    <p>threshold.invertExtent() Function </p> 
    <script>  
        var threshold = d3.scaleThreshold() 
                    // Setting domain for the scale. 
                    .domain([1, 2, 3, 4]) 
                    .range(["red", "green", "blue"]); 
        let val1=threshold.invertExtent("green"); 
        let val2=threshold.invertExtent("blue"); 
        document.write("<h4>["+val1+"]</h4>"); 
        document.write("<h4>["+val2+"]</h4>"); 
    </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>  
    <script src= 
    "https://d3js.org/d3-color.v1.min.js"> 
    </script>  
    <script src= 
    "https://d3js.org/d3-interpolate.v1.min.js"> 
    </script>  
    <script src= 
    "https://d3js.org/d3-scale-chromatic.v1.min.js"> 
    </script>  
</head>  
<body>  
    <h2 style="color:green;">Geeks for zambiatek</h2> 
    <p>threshold.invertExtent() Function </p> 
    <script>  
        var threshold = d3.scaleThreshold() 
                    // Setting domain for the scale. 
                    .domain([1, 2, 3, 4]) 
                    .range([10, 20, 30, 40, 50]); 
        let val1=threshold.invertExtent(10); 
        let val2=threshold.invertExtent(50); 
        let val3=threshold.invertExtent(20); 
        document.write("<h4>["+val1+"]</h4>"); 
        document.write("<h4>["+val2+"]</h4>"); 
        document.write("<h4>["+val3+"]</h4>"); 
    </script>  
</body>  
</html> 

Output:

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