JSFiddle - React, Tailwind, and code Playground

by agapetos

HTML

<select id="selEditRegion_1" multiple="multiple">
  <option value="4">Caribbean</option>
  <option value="8">Middle East</option>
  <option value="5">North America</option>
</select>

JavaScript

var res="4,5";
var trade_alert_id=1;
$.each(res.split(','), function(){
        var thisval = this
     
        $('#selEditRegion_' + trade_alert_id + ' option[value=' + thisval + ']').attr('selected','selected');
});