How can I get the data-id attribute?

Question

I'm using the jQuery Quicksand plugin. I need to get the data-id of the clicked item and pass it to a webservice.

How do I get the data-id attribute? I'm using the .on() method to re-bind the click event for sorted items.

$("#list li").on('click', function() {
  //  ret = DetailsView.GetProject($(this).attr("#data-id"), OnComplete, OnTimeOut, OnError);
  alert($(this).attr("#data-id"));
});

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>

<ul id="list" class="grid">
  <li data-id="id-40" class="win">
    <a id="ctl00_cphBody_ListView1_ctrl0_SelectButton" class="project" href="#">
      <img src="themes/clean/images/win.jpg" class="project-image" alt="get data-id" />
    </a>
  </li>
</ul>

Solution 1

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.

Solution 2

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

Solution 3

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

Solution 4

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

Solution 5

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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