Load lines into textarea

by Juan Lanus

HTML

<textarea autofocus id=laidTxt name=laidTxt class="laidTxt"
   rows="5" cols="33" wrap="off" placeholder="paste here">
</textarea>
<button
  onClick="
    const txtArea = getElementById( 'laidTxt' );
    let txt = txtArea.value.toUpperCase().split( '\n' );
    txtArea.value = txt.join( '\n' );
    txtArea.select();
  ">go</button>

JavaScript

const lines = [ 'line1', 'line2', 'line3' ];

window.addEventListener(
  'load',
  ( event ) => {
  	document.getElementById( 'laidTxt').value = lines.join( '\n' );
  }
);