How can I get the values of data attributes in JavaScript code

Question

I have next html   lt span data-typeId  quot 123 quot  data-type  quot topic quot  data-points  quot -1 quot  data-important  quot true quot       id  quot the-span quot  gt  lt  span gt   Is it possible to get the attributes that beginning with data-  and use it in the JavaScript code like code below  For now I get null as result  document getElementById  quot the-span quot   addEventListener  quot click quot   function        var json   JSON stringify           id  parseInt this typeId           subject  this datatype          points  parseInt this points           user   quot H  Pauwelyn quot

User · Answer

Modern browsers accepts HTML and SVG DOMnode.dataset

Using pure Javascript's DOM-node dataset property.

It is an old Javascript standard for HTML elements (since Chorme 8 and Firefox 6) but new for SVG (since year 2017 with Chorme 55.x and Firefox 51)... It is not a problem for SVG because in nowadays (2019) the version's usage share is dominated by modern browsers.

The values of dataset's key-values are pure strings, but a good practice is to adopt JSON string format for non-string datatypes, to parse it by JSON.parse().

Using the dataset property in any context

Code snippet to get and set key-value datasets at HTML and SVG contexts.

_x000D_

console.log("-- GET values --")_x000D_
var x = document.getElementById('html_example').dataset;_x000D_
console.log("s:", x.s );_x000D_
for (var i of JSON.parse(x.list)) console.log("list_i:",i)_x000D_
_x000D_
var y = document.getElementById('g1').dataset;_x000D_
console.log("s:", y.s );_x000D_
for (var i of JSON.parse(y.list)) console.log("list_i:",i)_x000D_
_x000D_
console.log("-- SET values --");_x000D_
y.s="BYE!"; y.list="null";_x000D_
console.log( document.getElementById('svg_example').innerHTML )

_x000D_

<p id="html_example" data-list="[1,2,3]" data-s="Hello123">Hello!</p>_x000D_
<svg id="svg_example">_x000D_
  <g id="g1" data-list="[4,5,6]" data-s="Hello456 SVG"></g>_x000D_
</svg>

_x000D_

User · Answer

if you are targeting data attribute in Html element   document dataset will not work  you should use   document querySelector  html   dataset pbUserId   or   document getElementsByTagName  html   0  dataset pbUserId

User · Answer

You need to access the dataset property   document getElementById  the-span   addEventListener  click   function       var json   JSON stringify       id  parseInt this dataset typeid       subject  this dataset type      points  parseInt this dataset points       user   Lu  s              Result      json would equal     id   123   subject    topic    points   -1   user    Lu  s

User · Answer

Try this instead of your code   var type     the-span   attr  data-type    alert type

User · Answer

You could also grab the attributes with the getAttribute   method which will return the value of a specific HTML attribute    x000D   x000D  var elem   document getElementById  the-span    x000D   x000D  var typeId   elem getAttribute  data-typeId    x000D  var type     elem getAttribute  data-type    x000D  var points   elem getAttribute  data-points    x000D  var important   elem getAttribute  data-important    x000D   x000D  console log  typeId    typeId    type    type    points    points    important    important   x000D     x000D   lt span data-typeId  123  data-type  topic  data-points  -1  data-important  true  id  the-span  gt  lt  span gt  x000D   x000D   x000D

User · Answer

Circa 2019  using jquery  this can be accessed using     DOMId   data  typeId   where     DOMId   is the jquery selector for your span element

User · Answer

Because the dataset property wasn t supported by Internet Explorer until version 11  you may want to use getAttribute   instead   document getElementById  the-span   addEventListener  click   function      console log this getAttribute  data-type           Dataset documentation  getAttribute documentation

User · Answer

You can access it as  element dataset points   etc  So in this case  this dataset points

[javascript] How can I get the values of data attributes in JavaScript code?

Modern browsers accepts HTML and SVG DOMnode.dataset

Using the dataset property in any context

Examples related to javascript

Examples related to html

Examples related to custom-data-attribute