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D3.js mouse() Function

  • Last Updated : 13 Aug, 2020

The d3.mouse() function in D3.js is used to return the x-coordinate and y-coordinate of the current event. If the event is clicked then it returns the x and y position of the click.

Syntax:

d3.mouse(container);

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

  • container: It is the name of the container or the HTML tag to which the event is attached.

Return Values: It returns the array of coordinates x and y.

Below examples illustrate the D3.js mouse() function In JavaScript:



Example1:

HTML




<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta
            name="viewport"
            path1tent="width=device-width, 
                       initial-scale=1.0"/>
        <title>D3.js mouse() Function</title>
    </head>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: green;
        }
    </style>
    <body>
        <div></div>
        <script src=
        </script>
        <script src=
        </script>
        <script>
            let btn = document.querySelector("div");
            var div = d3.select("div");
            div.on("click", createDot);
            function createDot() {
                
                // Using d3.mouse() function
                let pos = d3.mouse(this);
                console.log(pos);
            }
        </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"/>
        <title>D3.js mouse() Function</title>
    </head>
    <style>
        .div {
            width: 200px;
            height: 200px;
            background-color: green;
            overflow: hidden;
        }
        div {
            background-color: red;
            width: 10px;
            height: 10px;
        }
    </style>
    <body>
        <h2>click on the box</h2>
        <div class="div"></div>
        <script src=
        </script>
        <script src=
        </script>
        <script>
            let btn = document.querySelector("div");
            var div = d3.select("div");
            div.on("click", createDot);
            function createDot() {
                
                // Using d3.mouse() function
                let pos = d3.mouse(this);
                console.log(pos);
                d3.select("div")
                    .append("div")
                    .style("background-color", "white")
                    .style("position", "absolute")
                    .style("margin-left", `${pos[0] - 10}px`)
                    .style("margin-right", `${pos[0] - 10}px`)
                    .style("margin-top", `${pos[1] - 10}px`)
                    .style("margin-bottom", `${pos[1] - 10}px`);
            }
        </script>
    </body>
</html>

Output:

Before clicking the box:

After clicking the box:




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