JSFiddle - React, Tailwind, and code Playground
by reporter
HTML
<form>
<p>
Selecet 1 <select name="sel1" onChange="sel(this.name,'sel2')">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</p>
<p>
Selecet 2 <select name="sel2" onChange="sel(this.name,'sel1')">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</p>
</form>
JavaScript
function sel(sourceList, targetList)
{
}