Hiding button by "Id" works, but clicking it not

I execute the top portion here automatically.

In this script I can easily hide "showLine" via document.getElementById("showLine").style.visibility="hidden"; no problemo,

but document.getElementById("showLine").click(); will not fire no matter what I do…

The button does not press onload..

<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

//Autoexecute on pageload
<script type="text/javascript">
  $(document).ready(function () {
    document.getElementById("showLine").click();
    //document.getElementById("showLine").style.visibility="hidden";
  });
</script>

//script with button "showLine"
<script>
  var lines;
  var randomNumber;
  var lastRandomNumber;
  $(document.body).ready(function () {
    $.ajax({
      url: "https://ry3yr.github.io/OSTR/Diarykeepers_Homepage/Daymusic_array.js",
    }).done(function (content) {
      lines = content
        .replace(/\r\n|\r/g, "\n")
        .trim()
        .split("\n");
      lines = content
        .replace(/\r\n|\r/g, "quote")
        .trim()
        .split("quote");
      // ^^ line rmvl ^^^
      if (lines && lines.length) {
        $("#showLine").on("click", function () {
          while (randomNumber === lastRandomNumber) {
            randomNumber = parseInt(Math.random() * lines.length);
            if (lines.length === 1) {
              break;
            }
          }
          lastRandomNumber = randomNumber;
          $("#trivia").html(lines[randomNumber]);
        });
      }
    });
  });
</script>

<button id="showLine">CurrListening</button>
<p id="trivia"></p>

So how do I fix this clicking not working ?

PS:
I commented out the button, cause I used the visibility just for test purposes

>Solution :

You’re executing click() before the AJAX request resolves.

I would suggest simply triggering a click after registering the listener.

$("#showLine")
  .on("click", function () {
    while (randomNumber === lastRandomNumber) {
      randomNumber = parseInt(Math.random() * lines.length);
      if (lines.length === 1) {
        break;
      }
    }
    lastRandomNumber = randomNumber;
    $("#trivia").html(lines[randomNumber]);
  })
  .trigger("click");