How can I trigger a JavaScript download image action for a canvas PNG without complicated file system APIs or requiring direct user clicks?

General Discussions
4

Good points from both sides! If you prefer a jQuery approach, you can make this even easier. The jQuery code will ensure that the download action happens only after the user click:

$('#downloadBtn').on('click', function() {
  const canvas = $('#myCanvas')[0];
  const image = canvas.toDataURL('image/png');
  $('<a>')
    .attr('href', image)
    .attr('download', 'output.png')
    .appendTo('body')
    .get(0)
    .click();
  $('a').last().remove();
});

With this method, you’re wrapping everything in a nice jQuery handler. The download is triggered by a genuine click, which browsers are happy to accept, and you won’t run into any issues with user interaction!