Adding additional data to select options using jQuery

Question

HTML Markup

<select id="select">
  <option value="1" data-foo="dogs">this</option>
  <option value="2" data-foo="cats">that</option>
  <option value="3" data-foo="gerbils">other</option>
</select>

Code

// JavaScript using jQuery
$(function(){
    $('select').change(function(){
       var selected = $(this).find('option:selected');
       var extra = selected.data('foo'); 
       ...
    });
});

// Plain old JavaScript
var sel = document.getElementById('select');
var selected = sel.options[sel.selectedIndex];
var extra = selected.getAttribute('data-foo');

See this as a working sample using jQuery here: http://jsfiddle.net/GsdCj/1/
See this as a working sample using plain JavaScript here: http://jsfiddle.net/GsdCj/2/

By using data attributes from HTML5 you can add extra data to elements in a syntactically-valid manner that is also easily accessible from jQuery.

To me, it sounds like you want to create a new attribute? Do you want

<option value="2" value2="somethingElse">...

To do this, you can do

$(your selector).attr('value2', 'the value');

And then to retrieve it, you can use

$(your selector).attr('value2')

It's not going to be valid code, but I guess it does the job.

I made two examples from what I think your question might be:

http://jsfiddle.net/grdn4/

Check this out for storing additional values. It uses data attributes to store the other value:

http://jsfiddle.net/27qJP/1/