jQuery选择更改 [英] Jquery select change

问题描述

<select id="Nazione" name="Nazione">
    <option prefix='+93' value='AF' >Afghanistan </option>
    <option prefix='+355' value='AL' >Albania </option>
    <option prefix='+213' value='DZ' >Algeria </option>
    <option prefix='+376' value='AD' >Andorra .... etc
</select>

和这个js

$(document).ready(function() {  
    $('#Nazione').change(function(){

        alert( $(this).find("option:selected").attr('prefix') );
        alert( $(this).attr('prefix') );
    });
  });

我有警报NULL ... 为什么?

I have alert NULL... WHy?

推荐答案

您的代码很好.这是一个演示: http://jsfiddle.net/hKktc/1/

Your code is fine. Here's a demo : http://jsfiddle.net/hKktc/1/

您没有获得第二次警报调用的值的原因是因为select不存在属性prefix，而对于option

The reason you're not getting a value for the second alert call is because the attribute prefix doesn't exist for the select and only exists for the option

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