---
id: 587d7fa8367417b2b2512bc9
title: Update the Height of an Element Dynamically
challengeType: 6
forumTopicId: 301493
---
## 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($('div').eq(0)[0].style.height === '12px');
- text: The second div should have a height of 31 pixels.
testString: assert($('div').eq(1)[0].style.height === '31px');
- text: The third div should have a height of 22 pixels.
testString: assert($('div').eq(2)[0].style.height === '22px');
- text: The fourth div should have a height of 17 pixels.
testString: assert($('div').eq(3)[0].style.height === '17px');
- text: The fifth div should have a height of 25 pixels.
testString: assert($('div').eq(4)[0].style.height === '25px');
- text: The sixth div should have a height of 18 pixels.
testString: assert($('div').eq(5)[0].style.height === '18px');
- text: The seventh div should have a height of 29 pixels.
testString: assert($('div').eq(6)[0].style.height === '29px');
- text: The eighth div should have a height of 14 pixels.
testString: assert($('div').eq(7)[0].style.height === '14px');
- text: The ninth div should have a height of 9 pixels.
testString: assert($('div').eq(8)[0].style.height === '9px');
```
## Challenge Seed
## Solution