how to get element by attribute in javascript code example

Example 1: javascript get attribute

//HTML
//<div id="elem" data-id="4hJ3s"></div>

var elem = document.getElementById("elem");
elem.getAttribute("data-id"); // "4hJ3s"

Example 2: how to get element by attribute value in javascript

document.querySelectorAll('[data-foo="value"]');

Example 3: js get element by attribute

//find first element with "someAttr" attribute
document.querySelector('[someAttr]')

Example 4: js get element by attribute

//find all elements with "someAttr" attribute
document.querySelectorAll('[someAttr]')

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