Data Visualization with D3: Add a Tooltip to a D3 Element
A tool-tip shows more information about an item on a page when the user hovers over that item. There are several ways to add a tool-tip to a visualization, here uses the SVG
title element.title pairs with the text() method to dynamically add data to the bars.
<style>
.bar:hover {
fill: brown;
}
</style>
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - 3 * d)
.attr("width", 25)
.attr("height", (d, i) => d * 3)
.attr("fill", "navy")
.attr("class", "bar")
.append("title")
.text((d)=>d)
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text((d) => d)
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - (d * 3 + 3))
</script>
</body>
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