D3.js threshold.invertExtent() Function

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:

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> 
    <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 geeks</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:

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> 
    <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 geeks</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:

D3.js threshold.invertExtent() Function

Explore