javascript - jQuery $(this).attr ('data-id') -


i have jsp file wich display products, product class entity, , shopping cart written in js. in jsp have foreach added button, works first product others don't work @ all.

what wrote wrong? problem on jsp or in js?

jsp page

<c:foreach items="${produkt}" var="produkt"> <div class="produkt-container" style=" border: 1px solid #ccc; padding: 5px; width: 300px; margin: 10px ; display: inline-block;text-align:left;"> <a href="produkt${produkt.id}" >${produkt.model}</a> <%--<img src="${produkt.images[o]}" alt="">--%> <c:foreach items="${produkt.images}" var="image">     <img src="${image}" alt="" style="border: 1px solid black; width: 260px"> </c:foreach> <button id="buttonaddtocart"  data-art="${produkt.id}" style="margin: 5px; position: relative"> add cart </button> </div>

js page

console.log("test"); var cart = {}; $("#buttonaddtocart").click(function () {     var produktidforcart = $(this).attr('data-art');     if (cart[produktidforcart] != null) {         cart[produktidforcart]++;     }     else {         cart[produktidforcart] = 1;     }     console.log(cart); });

an important note:- id's need unique per element.so ask use class instead of id there below:-

<button class="buttonaddtocart" data-art="${produkt.id}" >

and change jquery code below:-

$(".buttonaddtocart").on('click',function(){     var produktidforcart = $(this).data('art');//prefer use .data     //...rest code

reference:- when better use .data() or .attr()?

in case if these buttons created dynamically use jquery event-delegation:-

$(document).on('click',".buttonaddtocart",function(){     var produktidforcart = $(this).data('art');//prefer use .data     //...rest code

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