How do I retrieve the zero-based index of the selected option in a select box?

Let's say I have the following in my HTML code:

  <select name="Currency" id="Currency">
    <option value="0.85">Euro</option>
    <option value="110.33">Japanese Yen</option>
    <option value="1.2">Canadian Dollars</option>
  </select>

Using jQuery, I can use $("#Currency").val() to give me the selectd value, and I can开发者_如何学JAVA use $("#Currency :selected").text() to get the selected text.

What do I need to do to get the zero-based index (in this case, 0, 1, or 2) of the current selection?

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You can get the selectedIndex attribute:

var index = $("#Currency").attr("selectedIndex");

Check an example here.

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$("Currency").attr("selectedIndex")

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document.getElementById("Currency").selectedIndex;

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alternative method is to access the native javascript property.

$("#Currency")[0].selectedIndex