data key html js code example

Example 1: html5 prefix

<!DOCTYPE html> <!-- This tag shows that it is running HTML5 -->

Example 2: html javascript find data attribute

//javascript get html data attribute
<button data-id="1" >Click</button>
<button data-id="2" >Click</button>
<button data-id="3" >Click</button>
const btns=document.querySelectorAll('button[data-id]');
[...btns].forEach(btn => console.log(btn.getAttribute('data-id')))

Example 3: get data attribute javascript

// <div id="element" data-name="john"></div>

const el = document.querySelector('#element')
el.dataset.name // 'john'

Example 4: data attribute html

<!-- data-* attritubes can be used on any html element -->
<div data-my-custom-data="true"></div>

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