使用本机javascript从select读取数据属性

Question

Problem is simple, I found some answers using jquery but none in native JS.

Not able to read the value of label, it should work in IE8+

var select = document.getElementById('test');

select.onchange = function() {
    //Value works fine 
    //alert(select.options[0].value);

    //How can I read data attribute?
    alert(select.options[0].data-label);
}

HTML:

<select id="test">
    <option data-label="label-1" value="HK">Hong Kong</option>
    <option data-label="label-2" value="CH">China</option>
</select>   

http://jsfiddle.net/Lnybn/

Answer 1

Because there is no native getData, you need to just say

getAttribute("data-label");

https://developer.mozilla.org/en-US/docs/Web/API/Element.getAttribute

The newer version of this (check browser support! IE 11!)

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dataset

element.dataset.label

Answer 2

You can use getAttribute .

Like this:

alert(select.options[0].getAttribute('data-label'));

Demo: http://jsfiddle.net/Lnybn/1/