To open the select file dialog via JavaScript, we call the file input’s click method.
For instance, we write
<button onclick="document.getElementById('file-input').click();">Open</button>
<input id="file-input" type="file" name="name" style="display: none" />
to add a button and set its onclick attribute to select the file input with getElementById on click.
And we call click to open the select file dialog.
We add a file input and hide it with display: none.
