176 lines
3.5 KiB
Markdown
176 lines
3.5 KiB
Markdown
---
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id: 587d7faa367417b2b2512bd6
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title: Add a Tooltip to a D3 Element
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challengeType: 6
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forumTopicId: 301470
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dashedName: add-a-tooltip-to-a-d3-element
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---
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# --description--
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A tooltip shows more information about an item on a page when the user hovers over that item. There are several ways to add a tooltip to a visualization, this challenge uses the SVG `title` element.
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`title` pairs with the `text()` method to dynamically add data to the bars.
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# --instructions--
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Append a `title` element under each `rect` node. Then call the `text()` method with a callback function so the text displays the data value.
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# --hints--
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Your code should have 9 `title` elements.
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```js
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assert($('title').length == 9);
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```
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The first `title` element should have tooltip text of 12.
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```js
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assert($('title').eq(0).text() == '12');
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```
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The second `title` element should have tooltip text of 31.
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```js
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assert($('title').eq(1).text() == '31');
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```
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The third `title` element should have tooltip text of 22.
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```js
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assert($('title').eq(2).text() == '22');
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```
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The fourth `title` element should have tooltip text of 17.
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```js
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assert($('title').eq(3).text() == '17');
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```
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The fifth `title` element should have tooltip text of 25.
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```js
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assert($('title').eq(4).text() == '25');
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```
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The sixth `title` element should have tooltip text of 18.
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```js
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assert($('title').eq(5).text() == '18');
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```
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The seventh `title` element should have tooltip text of 29.
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```js
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assert($('title').eq(6).text() == '29');
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```
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The eighth `title` element should have tooltip text of 14.
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```js
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assert($('title').eq(7).text() == '14');
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```
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The ninth `title` element should have tooltip text of 9.
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```js
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assert($('title').eq(8).text() == '9');
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```
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# --seed--
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## --seed-contents--
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```html
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<style>
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.bar:hover {
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fill: brown;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h);
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svg.selectAll("rect")
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.data(dataset)
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.enter()
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.append("rect")
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - 3 * d)
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.attr("width", 25)
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.attr("height", (d, i) => d * 3)
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.attr("fill", "navy")
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.attr("class", "bar")
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// Add your code below this line
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// Add your code above this line
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svg.selectAll("text")
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.data(dataset)
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.enter()
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.append("text")
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.text((d) => d)
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - (d * 3 + 3))
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</script>
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</body>
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```
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# --solutions--
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```html
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<style>
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.bar:hover {
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fill: brown;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h);
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svg.selectAll("rect")
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.data(dataset)
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.enter()
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.append("rect")
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - 3 * d)
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.attr("width", 25)
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.attr("height", (d, i) => d * 3)
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.attr("fill", "navy")
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.attr("class", "bar")
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.append("title")
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.text((d) => d)
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svg.selectAll("text")
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.data(dataset)
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.enter()
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.append("text")
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.text((d) => d)
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - (d * 3 + 3))
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</script>
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</body>
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```
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