JSFiddle - React, Tailwind, and code Playground

HTML

<select class="liste"  size="5">
                    	
						<option value="Minor">Minor</option>
						<option value="Single">Single</option>
						<option value="Married">Married</option>
						<option value="Divorced">Divorced</option>
						<option value="Widowed">Widowed</option>
                    </select>

<div id="absenden" style="display:none;">
    <input type="submit" value="senden" />
 </div>

JavaScript

jQuery("select.liste option").mosueup(function(){ 
    alert("test");
    if(jQuery("select.liste option:selected").length != 0){
    jQuery("#absenden").css("display", "block");
    }
    else{
    jQuery("#absenden").css("display", "none");
    }
   });