compose.js

function sendCheck(e) {
	var body = document.getElementById('compose-body').value;
	if (body.indexOf('attach') !== -1 || body.indexOf('Attach') !== -1) {
		/* Message body includes a word with the prefix attach, did the user forget an attachment? */
		var attachfiles = document.getElementById('compose-attachments').files;
		console.debug(attachfiles.length + " attachment(s) detected");
		if (attachfiles.length === 0) {
			if (confirm("Looks like you might have forgotten an attachment - send anyways?") !== true) {
				e.preventDefault();
				return;
			}
		}
	}
}
document.getElementById('btn-send').addEventListener('click', sendCheck, true);

document.addEventListener('DOMContentLoaded', () => {
	document.getElementById('from-addr-select').addEventListener("change", (event) => {
		if (event.target.value === "custom-addr") {
			var oldAddress = document.getElementById('from-addr-current').innerText;
			document.getElementById('from-addr-picker').innerHTML = "<label for='from'>From</label><input type='text' id='from' name='from' value='" + oldAddress + "'></input>";
		} else {
			document.getElementById('from-addr-current').innerText = event.target.value;
		}
	});
});