SVG Linear Gradient with D3

This example demonstrates how to use gradients in SVG, defining the stop colors completely via CSS. The advantage of this approach is that we can use gradients in shapes without having to hardcode the stop-color attributes when defining the gradients in the SVG element.

References

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>SVG Linear Gradient with D3</title>
        <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>

.stop-right {
                stop-color: #009688;  /* Teal */
            }

.filled {
                fill: url(#mainGradient);
            }

.outlined {
                fill:   none;
                stroke: url(#mainGradient);
                stroke-width: 4;
            }
        </style>

</head>
    <body>

var div = d3.select('#svg-container'),
                svg = div.append('svg');

svg.attr('width', width).attr('height', height);

// Create the svg:defs element and the main gradient definition.
            var svgDefs = svg.append('defs');

var mainGradient = svgDefs.append('linearGradient')
                .attr('id', 'mainGradient');

// Create the stops of the main gradient. Each stop will be assigned
            // a class to style the stop using CSS.
            mainGradient.append('stop')
                .attr('class', 'stop-left')
                .attr('offset', '0');

mainGradient.append('stop')
                .attr('class', 'stop-right')
                .attr('offset', '1');

// Use the gradient to set the shape fill, via CSS.
            svg.append('rect')
                .classed('filled', true)
                .attr('x', padding)
                .attr('y', padding)
                .attr('width', (width / 2) - 1.5 * padding)
                .attr('height', height - 2 * padding);

// Use the gradient to set the shape stroke, via CSS.
            svg.append('rect')
                .classed('outlined', true)
                .attr('x', width / 2 + padding / 2)
                .attr('y', padding)
                .attr('width', (width / 2) - 1.5 * padding)
                .attr('height', height - 2 * padding);
        </script>
    </body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js