JSFiddle - React, Tailwind, and code Playground
HTML
<select multiple id="selected_available_segments">
<option>test</option>
</select>
JavaScript
if ( $("#selected_available_segments option").length ) {
console.log("Im there!");
};
<select multiple id="selected_available_segments">
<option>test</option>
</select>
if ( $("#selected_available_segments option").length ) {
console.log("Im there!");
};