--- id: 587d7faa367417b2b2512bd6 title: Add a Tooltip to a D3 Element required: - src: 'https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js' challengeType: 6 --- ## 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 title element. title pairs with the text() method to dynamically add data to the bars.
## Instructions
Append a title element under each rect node. Then call the text() method with a callback function so the text displays the data value.
## Tests
```yml tests: - text: Your code should have 9 title elements. testString: 'assert($("title").length == 9, "Your code should have 9 title elements.");' - text: The first title element should have tooltip text of 12. testString: 'assert($("title").eq(0).text() == "12", "The first title element should have tooltip text of 12.");' - text: The second title element should have tooltip text of 31. testString: 'assert($("title").eq(1).text() == "31", "The second title element should have tooltip text of 31.");' - text: The third title element should have tooltip text of 22. testString: 'assert($("title").eq(2).text() == "22", "The third title element should have tooltip text of 22.");' - text: The fourth title element should have tooltip text of 17. testString: 'assert($("title").eq(3).text() == "17", "The fourth title element should have tooltip text of 17.");' - text: The fifth title element should have tooltip text of 25. testString: 'assert($("title").eq(4).text() == "25", "The fifth title element should have tooltip text of 25.");' - text: The sixth title element should have tooltip text of 18. testString: 'assert($("title").eq(5).text() == "18", "The sixth title element should have tooltip text of 18.");' - text: The seventh title element should have tooltip text of 29. testString: 'assert($("title").eq(6).text() == "29", "The seventh title element should have tooltip text of 29.");' - text: The eighth title element should have tooltip text of 14. testString: 'assert($("title").eq(7).text() == "14", "The eighth title element should have tooltip text of 14.");' - text: The ninth title element should have tooltip text of 9. testString: 'assert($("title").eq(8).text() == "9", "The ninth title element should have tooltip text of 9.");' ```
## Challenge Seed
```html ```
## Solution
```js // solution required ```