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Editorial Team
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Asked: 2026-06-08T23:09:48+00:00

In the following getElementsByTagName(p)[0] and getElementById(demo) access the same element. Both of the following

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In the following getElementsByTagName("p")[0] and getElementById("demo") access the same element.

Both of the following work, so I can’t figure out why the jquery data function is even needed. Is the second not portable to all browsers.

$(document.getElementsByTagName("p")[0]).data("funcZ", function() {console.log("ZZZZZ")})

$(document.getElementById("demo")).data("funcZ")()

document.getElementsByTagName("p")[0].funcX = function() {console.log("XXXXX")}

document.getElementById("demo").funcX()
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1 Answer

  1. Editorial Team

    According the the jQuery website:

    The jQuery.data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore free from memory leaks. jQuery ensures that the data is removed when DOM elements are removed via jQuery methods, and when the user leaves the page.

    It’s possible that by attaching random fields to a DOM element, when the DOM element disappears, the fields remain in memory. It looks like jQuery handles that for you.

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