Triggering saveAs from browser. https://stackoverflow.com/questions/283956/is-there-any-way-to-specify-a-suggested-filename-when-using-data-uri

saveAs.js

function saveAs(uri, filename) {
	var link = document.createElement('a');
	if (typeof link.download === 'string') {
		link.href = uri;
		link.download = filename;

		//Firefox requires the link to be in the body
		document.body.appendChild(link);

		//simulate click
		link.click();

		//remove the link when done
		document.body.removeChild(link);
	} else {
		window.open(uri);
	}
};