Question

I have a problem with click event; here’s the code:

jQuery:

$(document).ready(function() {
    $('.myClass').click(function() {
        alert($(.myClass).attr("iditem"));
    });
});

HTML:

<div class="myClass" iditem="1">
    1 
</div>
<div class="myClass" iditem="2">
    2
</div>

Two DIV with same class, but different values for the same attribute, when I click on a DIV, alert print always “1” (it seems ignoring the declaration of second DIV). Why .attr() doesn’t take the right value for the second DIV?

Answer 1

Assuming you have $('.myClass').attr("iditem"), this will always return the attribute of the first element in the set, as described in the documentation ^{[docs] þ}:

Get the value of an attribute for the first element in the set of matched elements.

So instead of selecting all elements with class myClass (that’s what $('.myClass') does, no matter where/when it is called), you want to get a reference to the clicked element. Simply do:

$(this).attr('iditem');

this always refers to the element the event handler was bound to.

I suggest to use HTML5 data-* attributes instead of custom attributes, to have at least valid HTML5:

 <div class="myClass" data-item="1">

You can then use .data() ^[docs] to retrieve the value.

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þ: You really should read jQuery’s documentation. It provides many examples and a detailed description of how each method works. Make sure you also understand how selectors ^[docs] work.