---
id: 587d7fa8367417b2b2512bc9
title: Update the Height of an Element Dynamically
required:
- src: 'https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js'
challengeType: 6
---
## 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.
## Tests
```yml
tests:
- text: The first div
should have a height
of 12 pixels.
testString: 'assert($(''div'').eq(0).css(''height'') == ''12px'', ''The first div
should have a height
of 12 pixels.'');'
- text: The second div
should have a height
of 31 pixels.
testString: 'assert($(''div'').eq(1).css(''height'') == ''31px'', ''The second div
should have a height
of 31 pixels.'');'
- text: The third div
should have a height
of 22 pixels.
testString: 'assert($(''div'').eq(2).css(''height'') == ''22px'', ''The third div
should have a height
of 22 pixels.'');'
- text: The fourth div
should have a height
of 17 pixels.
testString: 'assert($(''div'').eq(3).css(''height'') == ''17px'', ''The fourth div
should have a height
of 17 pixels.'');'
- text: The fifth div
should have a height
of 25 pixels.
testString: 'assert($(''div'').eq(4).css(''height'') == ''25px'', ''The fifth div
should have a height
of 25 pixels.'');'
- text: The sixth div
should have a height
of 18 pixels.
testString: 'assert($(''div'').eq(5).css(''height'') == ''18px'', ''The sixth div
should have a height
of 18 pixels.'');'
- text: The seventh div
should have a height
of 29 pixels.
testString: 'assert($(''div'').eq(6).css(''height'') == ''29px'', ''The seventh div
should have a height
of 29 pixels.'');'
- text: The eighth div
should have a height
of 14 pixels.
testString: 'assert($(''div'').eq(7).css(''height'') == ''14px'', ''The eighth div
should have a height
of 14 pixels.'');'
- text: The ninth div
should have a height
of 9 pixels.
testString: 'assert($(''div'').eq(8).css(''height'') == ''9px'', ''The ninth div
should have a height
of 9 pixels.'');'
```
## Challenge Seed
## Solution
```js
// solution required
```