How can I get the data-id attribute?

To get the contents of the attribute data-id (like in <a data-id="123">link</a>) you have to use

$(this).attr("data-id") // will return the string "123"

or .data() (if you use newer jQuery >= 1.4.3)

$(this).data("id") // will return the number 123

and the part after data- must be lowercase, e.g. data-idNum will not work, but data-idnum will.

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If we want to retrieve or update these attributes using existing, native JavaScript, then we can do so using the getAttribute and setAttribute methods as shown below:

Through JavaScript

<div id='strawberry-plant' data-fruit='12'></div>

<script>
// 'Getting' data-attributes using getAttribute
var plant = document.getElementById('strawberry-plant');
var fruitCount = plant.getAttribute('data-fruit'); // fruitCount = '12'

// 'Setting' data-attributes using setAttribute
plant.setAttribute('data-fruit','7'); // Pesky birds
</script>

Through jQuery

// Fetching data
var fruitCount = $(this).data('fruit');
OR 
// If you updated the value, you will need to use below code to fetch new value 
// otherwise above gives the old value which is intially set.
// And also above does not work in ***Firefox***, so use below code to fetch value
var fruitCount = $(this).attr('data-fruit');

// Assigning data
$(this).attr('data-fruit','7');

Read this documentation

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Important note. Keep in mind, that if you adjust the data- attribute dynamically via JavaScript it will not be reflected in the data() jQuery function. You have to adjust it via data() function as well.

<a data-id="123">link</a>

JavaScript:

$(this).data("id") // returns 123
$(this).attr("data-id", "321"); //change the attribute
$(this).data("id") // STILL returns 123!!!
$(this).data("id", "321")
$(this).data("id") // NOW we have 321

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If you are not concerned about old Internet Explorer browsers, you can also use HTML5 dataset API.

HTML

<div id="my-div" data-info="some info here" data-other-info="more info here">My Awesome Div</div>

JavaScript

var myDiv = document.querySelector('#my-div');

myDiv.dataset.info // "some info here"
myDiv.dataset.otherInfo // "more info here"

Demo: http://html5demos.com/dataset

Full browser support list: http://caniuse.com/#feat=dataset

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You can also use:

<select id="selectVehicle">
    <option value="1" data-year="2011">Mazda</option>
    <option value="2" data-year="2015">Honda</option>
    <option value="3" data-year="2008">Mercedes</option>
    <option value="4" data-year="2005">Toyota</option>
</select>

$("#selectVehicle").change(function () {
    alert($(this).find(':selected').data("year"));
});

Here is the working example: https://jsfiddle.net/ed5axgvk/1/

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This piece of code will return the value of the data attributes. For example: data-id, data-time, data-name, etc.

I have shown it for the id:

<a href="#" id="click-demo" data-id="a1">Click</a>

JavaScript: Get the value of the data-id -> a1

$(this).data("id");

JQuery: This will change the data-id -> a2

$(this).data("id", "a2");

JQuery: Get the value of the data-id -> a2

$(this).data("id");

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HTML

<span id="spanTest" data-value="50">test</span>

JavaScript

$(this).data().value;

or

$("span#spanTest").data().value;

ANS: 50

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Accessing the data attribute with its own id is a bit easy for me.

$("#Id").data("attribute");

function myFunction(){ alert($("#button1").data("sample-id")); } Clickhere

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var id = $(this).dataset.id

works for me!

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I use $.data:

//Set value 7 to data-id
$.data(this, 'id', 7);

//Get value from data-id
alert( $(this).data("id") ); // => outputs 7

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Using jQuery:

$(".myClass").load(function() {
  var myId = $(this).data("id");
  $('.myClass').attr('id', myId);
});

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Try

this.dataset.id

$("#list li").on('click', function() { alert( this.dataset.id ); });

• 

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for pure js

 let btn = document.querySelector('.your-btn-class');
 btn.addEventListener('click',function(){
 console.log(this.getAttribute('data-id'));
 })

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The issue is you are not specifying the option or selected option of dropdown or list, Here is an example for dropdown, i am assuming a data attribute data-record.

$('#select').on('change', function(){
        let element = $("#visiabletoID");
        element.val($(this).find(':selected').data('record'));
    });

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For those looking to dynamically remove and re-enable the tooltip, you can use the dispose and enable methods. See .tooltip('dispose').

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I have a span. I want to take the value of attribute data-txt-lang, which is used defined.

$(document).ready(function ()
{
    <span class="txt-lang-btn" data-txt-lang="en">EN</span>
    alert($('.txt-lang-btn').attr('data-txt-lang'));
});

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