JSFiddle - React, Tailwind, and code Playground
HTML
<div class="field_option">
<select class="field_option_select" name="item_1">
<option value="1" selected="true">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</div>
<div class="field_option">
<select class="field_option_select" name="item_2">
<option value="1" selected="true">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</div>
JavaScript
//this one doesn't work in IE 6,7,8 (didn't try 9)
console.log($('.field_option select [value="1"]').filter(':selected').length);
//this one works instead
console.log($('.field_option_select [value="1"]').filter(':selected').length);