JQuery从点击功能中回溯数据属性

Question

I have a div structure like this:

<div class='bar'>
    <div class='contents'>
        <div class='element' data-big='join'>JOIN ME</div>
        <div class='element' data-big='play'>PLAY ME</div>
        <div class='element' data-big='list'>GO TO LIST</div>
        <div class='element' data-big='chart'>GO TO TOP 10</div>
    </div>
</div>

How can I refer to their data attribute by onClick function?

I tried with

$(".bar .element").on('click', ()=> {
    alert($(this).data('big'));
});

But it always alert "undefined".

EDIT:

My assertion was bad from the beginning, I was using a lambda (or arrow) expression from the Typescript language. That makes the different meaning of the keyword "this".

the snippet:

$(".bar .element").on('click', function(){
    alert($(this).data('big'));
});

works as espected.

Answer 1

You do not have a .barra ( as you had in your original JS -- $(".barra .element") ) element in your HTML and you've not written the callback properly:

$(".bar .element").on('click', function() {
    alert($(this).data('big'));
});

  $(".bar .element").on('click', function() { alert($(this).data('big')); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div class='bar'> <div class='contents'> <div class='element' data-big='join'>JOIN ME</div> <div class='element' data-big='play'>PLAY ME</div> <div class='element' data-big='list'>GO TO LIST</div> <div class='element' data-big='chart'>GO TO TOP 10</div> </div> </div> 

Answer 2

you should change your function like below

$(".bar .element").on('click', function() {
    alert($(this).attr('data-big'));
});

Answer 3

In TypeScript, the arrow function expression ( () => ) is used to preserve the lexical scope. This means that when you use this inside of an arrow function, it will refer to the same scope as using this outside of the function.

In your case, you want the function to run with the scope of the onclick event, not the lexical scope, so you should avoid using the arrow function and instead use function () .

Answer 4

Here is the working solution:

jQuery:

$(".bar .element").on('click', function() {
    alert($(this).attr('data-big'));
});

DEMO

Answer 5

you can use "id" to do it:

 <div id='div1' class='element' data-big='join'>JOIN ME</div> 

 $("#div1").on('click', ()=> { alert($(this).data('big')); });