112 lines
3.8 KiB
Markdown
112 lines
3.8 KiB
Markdown
---
|
|
id: 587d7faa367417b2b2512bd6
|
|
title: Add a Tooltip to a D3 Element
|
|
challengeType: 6
|
|
---
|
|
|
|
## Description
|
|
<section id='description'>
|
|
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 <code>title</code> element.
|
|
<code>title</code> pairs with the <code>text()</code> method to dynamically add data to the bars.
|
|
</section>
|
|
|
|
## Instructions
|
|
<section id='instructions'>
|
|
Append a <code>title</code> element under each <code>rect</code> node. Then call the <code>text()</code> method with a callback function so the text displays the data value.
|
|
</section>
|
|
|
|
## Tests
|
|
<section id='tests'>
|
|
|
|
```yml
|
|
tests:
|
|
- text: Your code should have 9 <code>title</code> elements.
|
|
testString: assert($('title').length == 9, 'Your code should have 9 <code>title</code> elements.');
|
|
- text: The first <code>title</code> element should have tooltip text of 12.
|
|
testString: assert($('title').eq(0).text() == '12', 'The first <code>title</code> element should have tooltip text of 12.');
|
|
- text: The second <code>title</code> element should have tooltip text of 31.
|
|
testString: assert($('title').eq(1).text() == '31', 'The second <code>title</code> element should have tooltip text of 31.');
|
|
- text: The third <code>title</code> element should have tooltip text of 22.
|
|
testString: assert($('title').eq(2).text() == '22', 'The third <code>title</code> element should have tooltip text of 22.');
|
|
- text: The fourth <code>title</code> element should have tooltip text of 17.
|
|
testString: assert($('title').eq(3).text() == '17', 'The fourth <code>title</code> element should have tooltip text of 17.');
|
|
- text: The fifth <code>title</code> element should have tooltip text of 25.
|
|
testString: assert($('title').eq(4).text() == '25', 'The fifth <code>title</code> element should have tooltip text of 25.');
|
|
- text: The sixth <code>title</code> element should have tooltip text of 18.
|
|
testString: assert($('title').eq(5).text() == '18', 'The sixth <code>title</code> element should have tooltip text of 18.');
|
|
- text: The seventh <code>title</code> element should have tooltip text of 29.
|
|
testString: assert($('title').eq(6).text() == '29', 'The seventh <code>title</code> element should have tooltip text of 29.');
|
|
- text: The eighth <code>title</code> element should have tooltip text of 14.
|
|
testString: assert($('title').eq(7).text() == '14', 'The eighth <code>title</code> element should have tooltip text of 14.');
|
|
- text: The ninth <code>title</code> element should have tooltip text of 9.
|
|
testString: assert($('title').eq(8).text() == '9', 'The ninth <code>title</code> element should have tooltip text of 9.');
|
|
|
|
```
|
|
|
|
</section>
|
|
|
|
## Challenge Seed
|
|
<section id='challengeSeed'>
|
|
|
|
<div id='html-seed'>
|
|
|
|
```html
|
|
<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")
|
|
// Add your code below this line
|
|
|
|
|
|
|
|
// Add your code above this line
|
|
|
|
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>
|
|
```
|
|
|
|
</div>
|
|
|
|
|
|
|
|
</section>
|
|
|
|
## Solution
|
|
<section id='solution'>
|
|
|
|
```js
|
|
// solution required
|
|
```
|
|
</section>
|