Axes can be drawn using built-in D3 functions. This is made of Lines, Ticks and Labels. The d3.axisTop() function in D3.js is used to create a top horizontal axis. This function will construct a new top-oriented axis generator for the given scale, with empty tick arguments, a tick size of 6 and padding of 3.
Axis API can be configured using the following script.
<script src = "https://d3js.org/d3-axis.v1.min.js"></script>
Syntax:
d3.axisTop(scale)
Parameters: This function accepts only one parameter as mentioned above and described below:
- scale: This parameter is the scale used.
Return Value: This function returns a top horizontal axis.
Below programs illustrate the d3.axisTop() function in D3.js:
Example 1:
HTML
<!DOCTYPE html> <html>   <head>     <title>         D3.js | d3.axisTop() Function     </title>     <script type="text/javascript"     </script> </head>   <body>     <script>         var width = 400, height = 400;         var svg = d3.select("body")             .append("svg")             .attr("width", width)             .attr("height", height);           var xscale = d3.scaleLinear()             .domain([0, 100])             .range([0, width - 50]);           var x_axis = d3.axisTop(xscale);           svg.append("g")             .attr("transform", "translate(20,100)")             .call(x_axis)     </script> </body>   </html> |
Output:
Example 2:
HTML
<!DOCTYPE html> <html>   <head>     <title>         D3.js | d3.axisTop() Function     </title>           <script type="text/javascript"     </script>           <style>         svg text {             fill: green;             font: 15px sans-serif;             text-anchor: end;         }     </style> </head>   <body>     <script>         var width = 400, height = 400;         var data = [10, 12, 14, 16, 18, 20];         var svg = d3.select("body")             .append("svg")             .attr("width", width)             .attr("height", height);           var xscale = d3.scaleLinear()             .domain([d3.min(data), d3.max(data)])             .range([0, width - 60]);           var x_axis = d3.axisTop(xscale);           var xAxisTranslate = height / 2;           svg.append("g")             .attr("transform", "translate(50, "             + xAxisTranslate + ")")             .call(x_axis)     </script> </body>   </html> |
Output:
Reference: https://devdocs.io/d3~5/d3-axis#axisTop
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