Search still works after deleting a user + cells keep being created without an input

been working on some basic contacts app and got stuck in two places. Cells keep being created in the table even if there’s no input (I’ve tried if statements) + after deleting a contact I can still search for it. How to remove it from the database? Is it possible to make the create button appear after all the fields have input in it? How can I remove the elements from db array after deleting the cells?

let db = [];
let contact = {};
// ADD CONTACT
$(document).ready(function() {
$("#create-contact").on("click", function(event) {
  event.preventDefault();

  contact.firstName = $('#name').val();
  contact.surname = $('#surname').val();
  contact.phone = $("#phone").val();
  contact.address = $("#address").val();

  let row = document.createElement("tr");
  $("table").append(row);
  let cell1 = document.createElement("td");
  let cell2 = document.createElement("td");
  let cell3 = document.createElement("td");
  let cell4 = document.createElement("td");
  let dltBtn = document.createElement("button");
  /* ^ https://stackoverflow.com/questions/268490/jquery-document-createelement-equivalent
     Fastest method */

  $(dltBtn).text("X")
  .css("width", "8.5rem")
  .css("color", "white")
  .css("background-color", "black")
  .attr("class", "dltBtn");


  $(cell1).html(contact.firstName);
  $(cell2).html(contact.surname);
  $(cell3).html(contact.phone);
  $(cell4).html(contact.address);

  row.append(cell1, cell2, cell3, cell4,dltBtn);


  db.push(contact.firstName, contact.surname, contact.phone, contact.address);

  console.log(db);

  $('.dltBtn').on('click', function(event) {
      event.preventDefault();

    row.remove(dltBtn)
    .deleteCell();

  });

});

// SEARCH
function search(name) {
  for (i = 0; i < db.length; i++) {
    if (!isNaN(name) && db[i] === name) {
      return db[i-2] + "  " + db[i-1] + "   " + db[i] + "  " + db[i+1];
    }
    if (db[i].toUpperCase() === name.toUpperCase()) {
      return db[i] + "  " + db[i+1] + "   " + db[i+2] + "  " + db[i+3];
    }
    $("#found").text("User not found!");
  }


};

$('.searchbutton').on('click', function(event) {
    event.preventDefault();

    var findUserName = $('#query').val();
    var userFound = search(findUserName);

    $("#found").text(userFound);
    console.log(db);
});
});
```  ^ JS