16e420021c
* chore(learn): audit d3 projects * chore: audit data vis * chore: audit json apis * Update curriculum/challenges/english/04-data-visualization/data-visualization-projects/visualize-data-with-a-scatterplot-graph.md Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * fix: apply suggestions Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> * fix: no colour backticks Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * Update curriculum/challenges/english/04-data-visualization/json-apis-and-ajax/get-geolocation-data-to-find-a-users-gps-coordinates.md Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> * Apply suggestions from code review Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> Co-authored-by: Shaun Hamilton <51722130+ShaunSHamilton@users.noreply.github.com> Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com>
121 lines
2.7 KiB
Markdown
121 lines
2.7 KiB
Markdown
---
|
|
id: 587d7fa7367417b2b2512bc5
|
|
title: Work with Dynamic Data in D3
|
|
challengeType: 6
|
|
forumTopicId: 301498
|
|
dashedName: work-with-dynamic-data-in-d3
|
|
---
|
|
|
|
# --description--
|
|
|
|
The last two challenges cover the basics of displaying data dynamically with D3 using the `data()` and `enter()` methods. These methods take a data set and, together with the `append()` method, create a new DOM element for each entry in the data set.
|
|
|
|
In the previous challenge, you created a new `h2` element for each item in the `dataset` array, but they all contained the same text, `New Title`. This is because you have not made use of the data that is bound to each of the `h2` elements.
|
|
|
|
The D3 `text()` method can take a string or a callback function as an argument:
|
|
|
|
`selection.text((d) => d)`
|
|
|
|
In the example above, the parameter `d` refers to a single entry in the dataset that a selection is bound to.
|
|
|
|
Using the current example as context, the first `h2` element is bound to 12, the second `h2` element is bound to 31, the third `h2` element is bound to 22, and so on.
|
|
|
|
# --instructions--
|
|
|
|
Change the `text()` method so that each `h2` element displays the corresponding value from the `dataset` array with a single space and the string `USD`. For example, the first heading should be `12 USD`.
|
|
|
|
# --hints--
|
|
|
|
The first `h2` should have the text `12 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(0).text() == '12 USD');
|
|
```
|
|
|
|
The second `h2` should have the text `31 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(1).text() == '31 USD');
|
|
```
|
|
|
|
The third `h2` should have the text `22 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(2).text() == '22 USD');
|
|
```
|
|
|
|
The fourth `h2` should have the text `17 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(3).text() == '17 USD');
|
|
```
|
|
|
|
The fifth `h2` should have the text `25 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(4).text() == '25 USD');
|
|
```
|
|
|
|
The sixth `h2` should have the text `18 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(5).text() == '18 USD');
|
|
```
|
|
|
|
The seventh `h2` should have the text `29 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(6).text() == '29 USD');
|
|
```
|
|
|
|
The eighth `h2` should have the text `14 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(7).text() == '14 USD');
|
|
```
|
|
|
|
The ninth `h2` should have the text `9 USD`.
|
|
|
|
```js
|
|
assert($('h2').eq(8).text() == '9 USD');
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```html
|
|
<body>
|
|
<script>
|
|
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
|
|
|
|
d3.select("body").selectAll("h2")
|
|
.data(dataset)
|
|
.enter()
|
|
.append("h2")
|
|
// Add your code below this line
|
|
|
|
.text("New Title");
|
|
|
|
// Add your code above this line
|
|
</script>
|
|
</body>
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```html
|
|
<body>
|
|
<script>
|
|
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
|
|
|
|
d3.select("body").selectAll("h2")
|
|
.data(dataset)
|
|
.enter()
|
|
.append("h2")
|
|
.text((d) => `${d} USD`);
|
|
|
|
</script>
|
|
</body>
|
|
```
|