var get=document.getElementById("nameholder").value; var submit=document.getElementById("submit"); submit.addEventListener("click",function(){ console.log(get); });Prueba esto a continuación:
var submit = document.getElementById("submit"); submit.addEventListener("click", function() { var get = document.getElementById("nameholder").value; console.log(get); }); <input type='text' id="nameholder" /> <input type='submit' id="submit" />