How just select folder directory not file directory?

I using js to create my from, my problem is how to just select folder directory not file directory?

Belows is my coding:

<input type="file" id="real-file" hidden="hidden" />
<button type="button" id="custom-button">CHOOSE A FILE</button>
<span id="custom-text">No file chosen, yet.</span>

<script type="text/javascript">
const realFileBtn = document.getElementById("real-file");
const customBtn = document.getElementById("custom-button");
const customTxt = document.getElementById("custom-text");

customBtn.addEventListener("click", function() {
  realFileBtn.click();
});

realFileBtn.addEventListener("change", function() {
  if (realFileBtn.value) {
    customTxt.innerHTML = realFileBtn.value;
  } else {
    customTxt.innerHTML = "No file chosen, yet.";
  }
});
</script>

Below is my output:

Actually I want the output not select the file, just select the folder, because the next step I need store file in this folder directory. If success the output is folder directory name is C:\Staff Import Folder\Source

Hope someone can help me solve this problem. Thanks.