JSFiddle - React, Tailwind, and code Playground

HTML

<select id="Locations" name='Locations[]' style='width:100%;' data-placeholder='Type or select   
locations' multiple class='chosen-select-no-results'>
    <option value="1">Bangalore</option>
    <option value="2">Chennai</option>
    <option value="3">Delhi</option>
    <option value="4">Gurgaon</option>
    <option value="5">Hyderabad</option>
    <option value="6">Kolkata</option>
    <option value="7">Mumbai / Navi Mumbai</option>
</select>

JavaScript

$("#Locations").find("option").each(function () {
    if($(this).val() == 1)
    {
        $(this).prop('selected', true);
    }
    if($(this).val() == 2)
    {
        $(this).prop('selected', true);
    }
});