Data attribute inside "select"
by chridam
HTML
<select id="company_select" class="dates">
<option value="ABC" data-company_system_name="ABC">ABC</option>
<option value="DEF" data-company_system_name="1/2/11">DEF</option>
<option value="GHI" data-company_system_name="GHI">GHI</option>
</select>
<input type="text" class="system_name" value="" />
JavaScript
var optData = $("#company_select option").filter(function(){
return $(this).text() === val;
}).data("company_system_name");
console.log(optData);
$('input.system_name').val(optData);