JavaScript Reference
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Quick Reference

The Element style property sets or returns the values of an element’s style attribute.

<!-- html element to place output -->
<p id="my_output" style="border-top: red solid thin;"></p>

Get the value:

// variable
let my_value = document.getElementById('my_output').style.borderTopColor;

// output to the HTML element
document.getElementById('my_output').innerHTML = my_value;

Set the value:

document.getElementById('my_output').style.borderTopColor = 'red';

Note

When referring to element element’s style attribute using JavaScript, the hyphen is not used, and words following the first word have their first letter capitalized. The following shows the CSS value and it’s JavaScript counterpart.

border-top = borderTop
border-color = borderColor
border-top-color = borderTopColor

Output

red

Syntax

Get the value:

element.style.property

Set the value:

element.style.property = value

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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