JSFiddle - React, Tailwind, and code Playground

HTML

<select id="selectBox">
    <option value="">Select</option>
    <option value="all">all</option>
    <option value="0">Number 0</option>
    <option value="1">Number 1</option>
    <option value="2">Number 2</option>
    <option value="3">Number 3</option>
    <option value="4">Number 4</option>
    <option value="5">Number 5</option>
    <option value="6">Number 6</option>
    <option value="7">Number 7</option>
</select>

JavaScript

$("#selectBox").live('change',function(){
    var val=this.value;
    var allValues = null;

    if (val=="all") {
        allValues = $("#selectBox > option:not(:first):not('[value=all]')").map(function() {
           return this.value;
      }).get();  //[0,1,2,3,4,5,6,7]
    }
    
    alert(allValues);
});