2018-10-10 18:03:03 -04:00
|
|
|
---
|
|
|
|
|
id: 587d7faa367417b2b2512bd6
|
2021-03-04 09:49:46 -08:00
|
|
|
title: 给 D3 元素添加工具提示
|
2018-10-10 18:03:03 -04:00
|
|
|
challengeType: 6
|
2020-09-18 00:13:05 +08:00
|
|
|
forumTopicId: 301470
|
2021-01-13 03:31:00 +01:00
|
|
|
dashedName: add-a-tooltip-to-a-d3-element
|
2018-10-10 18:03:03 -04:00
|
|
|
---
|
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
# --description--
|
|
|
|
|
|
2021-03-04 09:49:46 -08:00
|
|
|
当用户在一个对象上悬停时，提示框可以显示关于这个对象更多的信息。 在可视化中有多种方法添加提示框，这个挑战将使用 SVG 的 `title` 元素。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
2021-03-04 09:49:46 -08:00
|
|
|
`title` 和 `text()` 方法一起给每组动态添加数据。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
# --instructions--
|
|
|
|
|
|
2021-03-04 09:49:46 -08:00
|
|
|
在每个 `rect` 节点下附加 `title` 元素。 然后用回调函数调用 `text()` 方法使它的文本显示数据值。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
# --hints--
|
|
|
|
|
|
2021-03-04 09:49:46 -08:00
|
|
|
你应该有 9 个 `title` 元素。
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
```js
|
|
|
|
|
assert($('title').length == 9);
|
2018-10-10 18:03:03 -04:00
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第一个 `title` 元素的提示框文本应为 `12`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(0).text() == '12');
|
|
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第二个 `title` 元素的提示框文本应为 `31`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(1).text() == '31');
|
2018-10-10 18:03:03 -04:00
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第三个 `title` 元素的提示框文本应为 `22`。
|
2020-09-18 00:13:05 +08:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
```js
|
|
|
|
|
assert($('title').eq(2).text() == '22');
|
2018-10-10 18:03:03 -04:00
|
|
|
```
|
2020-08-13 17:24:35 +02:00
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第四个 `title` 元素的提示框文本应为 `17`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(3).text() == '17');
|
|
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第五个 `title` 元素的提示框文本应为 `25`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(4).text() == '25');
|
|
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第六个 `title` 元素的提示框文本应为 `18`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(5).text() == '18');
|
|
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第七个 `title` 元素的提示框文本应为 `29`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(6).text() == '29');
|
|
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第八个 `title` 元素的提示框文本应为 `14`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(7).text() == '14');
|
|
|
|
|
```
|
|
|
|
|
|
2021-03-08 07:28:46 -07:00
|
|
|
第九个 `title` 元素的提示框文本应为 `9`。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
```js
|
|
|
|
|
assert($('title').eq(8).text() == '9');
|
|
|
|
|
```
|
|
|
|
|
|
2021-01-13 03:31:00 +01:00
|
|
|
# --seed--
|
|
|
|
|
|
|
|
|
|
## --seed-contents--
|
|
|
|
|
|
|
|
|
|
```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>
|
|
|
|
|
```
|
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
# --solutions--
|
|
|
|
|
|
2021-01-13 03:31:00 +01:00
|
|
|
```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")
|
|
|
|
|
.append("title")
|
|
|
|
|
.text((d) => d)
|
2021-02-06 04:42:36 +00:00
|
|
|
|
2021-01-13 03:31:00 +01:00
|
|
|
|
|
|
|
|
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>
|
|
|
|
|
```
|
