Add custom button

[DKMiller71]

Is there a way to have it add a custom button to the button set and link to a function?

For example: for a puzzle with specially marked cells, have a custom button "Get Marked Cells" that pops up the content of those cells?

I know this could be done in the preamble section or similar, but I'd like it be in the buttons group and follow the button formatting.

[viresh-ratnakar]

Sure, I've done it myself in this puzzle. You do it from the customizeExolve() method that gets called automatically when using createExolve() (the Exolve(...) constructor also provides a parameter for such a function, if you're using the constructor directly).

function customizeExolve(puz) {
  const b = document.createElement('button');
  b.className = 'xlv-button';
  b.innerHTML = 'Dkm!';
  b.title = 'Click for Dkm!'
  b.addEventListener('click', (evt) => {
    alert('You clicked on Dkm!');
  });
  /**
   * You can append to puz.buttonRow1 if you prefer,
   * which you'd have to if the puzzle does not provide
   * solutions as there is no second row then.
   */
  puz.buttonRow2.appendChild(b);
}