Javascript : Get dropdownlist value by text

Javascript
=========
var i ;
var searchtext = "Yangon";
var citycode;
var ddl = document.getElementById("ddlCity");
for (i = 0; i < ddl.options.length; i++) {
if (ddl.options[i].text == searchtext ) {
              citycode = ddl.options[j].value;
}
}