how can automatically event is trigger when alert-box is show on page in javascript?

<input type="text" value="Hello World"><br><br>
<button>Trigger the select event for the input field</button>
</br></br>

$("input").click(function(){
       $("input").after(" Text marked!");
   });
   $("button").click(function(){
       alert("This is a alert");
       $("input").trigger("click");
   });