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>
136 lines
2.8 KiB
Markdown
136 lines
2.8 KiB
Markdown
---
|
|
id: 587d7fa8367417b2b2512bc9
|
|
title: Update the Height of an Element Dynamically
|
|
challengeType: 6
|
|
forumTopicId: 301493
|
|
dashedName: update-the-height-of-an-element-dynamically
|
|
---
|
|
|
|
# --description--
|
|
|
|
The previous challenges covered how to display data from an array and how to add CSS classes. You can combine these lessons to create a simple bar chart. There are two steps to this:
|
|
|
|
1) Create a `div` for each data point in the array
|
|
|
|
2) Give each `div` a dynamic height, using a callback function in the `style()` method that sets height equal to the data value
|
|
|
|
Recall the format to set a style using a callback function:
|
|
|
|
`selection.style("cssProperty", (d) => d)`
|
|
|
|
# --instructions--
|
|
|
|
Add the `style()` method to the code in the editor to set the `height` property for each element. Use a callback function to return the value of the data point with the string `px` added to it.
|
|
|
|
# --hints--
|
|
|
|
The first `div` should have a `height` of `12` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(0)[0].style.height === '12px');
|
|
```
|
|
|
|
The second `div` should have a `height` of `31` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(1)[0].style.height === '31px');
|
|
```
|
|
|
|
The third `div` should have a `height` of `22` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(2)[0].style.height === '22px');
|
|
```
|
|
|
|
The fourth `div` should have a `height` of `17` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(3)[0].style.height === '17px');
|
|
```
|
|
|
|
The fifth `div` should have a `height` of `25` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(4)[0].style.height === '25px');
|
|
```
|
|
|
|
The sixth `div` should have a `height` of `18` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(5)[0].style.height === '18px');
|
|
```
|
|
|
|
The seventh `div` should have a `height` of `29` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(6)[0].style.height === '29px');
|
|
```
|
|
|
|
The eighth `div` should have a `height` of `14` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(7)[0].style.height === '14px');
|
|
```
|
|
|
|
The ninth `div` should have a `height` of `9` pixels.
|
|
|
|
```js
|
|
assert($('div').eq(8)[0].style.height === '9px');
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```html
|
|
<style>
|
|
.bar {
|
|
width: 25px;
|
|
height: 100px;
|
|
display: inline-block;
|
|
background-color: blue;
|
|
}
|
|
</style>
|
|
<body>
|
|
<script>
|
|
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
|
|
|
|
d3.select("body").selectAll("div")
|
|
.data(dataset)
|
|
.enter()
|
|
.append("div")
|
|
.attr("class", "bar")
|
|
// Add your code below this line
|
|
|
|
|
|
|
|
// Add your code above this line
|
|
</script>
|
|
</body>
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```html
|
|
<style>
|
|
.bar {
|
|
width: 25px;
|
|
height: 100px;
|
|
display: inline-block;
|
|
background-color: blue;
|
|
}
|
|
</style>
|
|
<body>
|
|
<script>
|
|
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
|
|
|
|
d3.select("body").selectAll("div")
|
|
.data(dataset)
|
|
.enter()
|
|
.append("div")
|
|
.attr("class", "bar")
|
|
.style('height', d => `${d}px`)
|
|
</script>
|
|
</body>
|
|
```
|