162 lines
3.7 KiB
Markdown
162 lines
3.7 KiB
Markdown
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---
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id: 587d7fa8367417b2b2512bca
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title: Change the Presentation of a Bar Chart
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challengeType: 6
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forumTopicId: 301481
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dashedName: change-the-presentation-of-a-bar-chart
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---
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# --description--
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The last challenge created a bar chart, but there are a couple of formatting changes that could improve it:
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1) Add space between each bar to visually separate them, which is done by adding a margin to the CSS for the `bar` class
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2) Increase the height of the bars to better show the difference in values, which is done by multiplying the value by a number to scale the height
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# --instructions--
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First, add a `margin` of `2px` to the `bar` class in the `style` tag. Next, change the callback function in the `style()` method so it returns a value `10` times the original data value (plus the `px`).
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**Note:** Multiplying each data point by the *same* constant only alters the scale. It's like zooming in, and it doesn't change the meaning of the underlying data.
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# --hints--
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The first `div` should have a `height` of `120` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(0).css('height') == '120px' &&
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$('div').eq(0).css('margin-right') == '2px'
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);
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```
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The second `div` should have a `height` of `310` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(1).css('height') == '310px' &&
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$('div').eq(1).css('margin-right') == '2px'
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);
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```
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The third `div` should have a `height` of `220` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(2).css('height') == '220px' &&
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$('div').eq(2).css('margin-right') == '2px'
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);
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```
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The fourth `div` should have a `height` of `170` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(3).css('height') == '170px' &&
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$('div').eq(3).css('margin-right') == '2px'
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);
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```
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The fifth `div` should have a `height` of `250` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(4).css('height') == '250px' &&
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$('div').eq(4).css('margin-right') == '2px'
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);
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```
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The sixth `div` should have a `height` of `180` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(5).css('height') == '180px' &&
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$('div').eq(5).css('margin-right') == '2px'
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);
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```
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The seventh `div` should have a `height` of `290` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(6).css('height') == '290px' &&
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$('div').eq(6).css('margin-right') == '2px'
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);
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```
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The eighth `div` should have a `height` of `140` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(7).css('height') == '140px' &&
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$('div').eq(7).css('margin-right') == '2px'
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);
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```
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The ninth `div` should have a `height` of `90` pixels and a `margin` of `2` pixels.
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```js
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assert(
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$('div').eq(8).css('height') == '90px' &&
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$('div').eq(8).css('margin-right') == '2px'
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);
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```
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# --seed--
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## --seed-contents--
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```html
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<style>
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.bar {
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width: 25px;
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height: 100px;
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/* Add your code below this line */
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/* Add your code above this line */
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display: inline-block;
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background-color: blue;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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d3.select("body").selectAll("div")
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.data(dataset)
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.enter()
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.append("div")
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.attr("class", "bar")
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.style("height", (d) => (d + "px")) // Change this line
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</script>
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</body>
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```
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# --solutions--
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```html
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<style>
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.bar {
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width: 25px;
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height: 100px;
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margin: 2px;
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display: inline-block;
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background-color: blue;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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d3.select("body").selectAll("div")
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.data(dataset)
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.enter()
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.append("div")
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.attr("class", "bar")
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.style("height", (d) => (d * 10 + "px"))
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</script>
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</body>
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```
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