Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<select multiple="multiple" id="idCountry" size=10>
    <optgroup label="ASIA">
      <option value="AUSTRALIA">AUSTRALIA</option>
      <option value="CHINA">CHINA</option>
    </optgroup>
    <optgroup label="EUROPE">
      <option value="FRANCE">FRANCE</option>
      <option value="UK">UK</option>
    </optgroup>
</select>

JavaScript

$('optgroup[label=EUROPE] option').prop('selected',true)

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