JSFiddle - React, Tailwind, and code Playground
by hescano
HTML
<select multiple="multiple" class="options" id="textarea">
<option value="item1">Item 1</option>
<option value="item2">Item 2</option>
<option value="item3">Item 3</option>
<option value="item4">Item 4</option>
<option value="item5">Item 5</option>
</select>
<select id="textarea2" multiple class="remove">
</select>
<input type="button" value="Copy Selected" id="copy" />
<input type="button" value="Move" id="remove" />
JavaScript
$("#copy").on("click", function()
{
$("#textarea2").append($("#textarea option:selected").clone());
});
$("#remove").on("click", function(){
$("#textarea2").append($("#textarea option:selected"));
});