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(function main() {
/* Takes control of the form if javascript is enabled, so that adding stuff to a playlist will not cause things to stop loading, and will display a status message. If javascript is disabled, the form will still work using regular HTML methods, but causes things on the page (such as the video) to stop loading. */
const playlistAddForm = document.getElementById('playlist-edit');
function setStyle(element, property, value){
element.style[property] = value;
}
function removeMessage(messageBox){
messageBox.parentNode.removeChild(messageBox);
}
function displayMessage(text, error=false){
let currentMessageBox = document.getElementById('message-box');
if(currentMessageBox !== null){
currentMessageBox.parentNode.removeChild(currentMessageBox);
}
let messageBox = document.createElement('div');
if(error){
messageBox.setAttribute('role', 'alert');
} else {
messageBox.setAttribute('role', 'status');
}
messageBox.setAttribute('id', 'message-box');
let textNode = document.createTextNode(text);
messageBox.appendChild(textNode);
document.querySelector('main').appendChild(messageBox);
let currentstyle = window.getComputedStyle(messageBox);
let removalDelay;
if(error){
removalDelay = 5000;
} else {
removalDelay = 1500;
}
window.setTimeout(setStyle, 20, messageBox, 'opacity', 1);
window.setTimeout(setStyle, removalDelay, messageBox, 'opacity', 0);
window.setTimeout(removeMessage, removalDelay+300, messageBox);
}
// https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Sending_forms_through_JavaScript
function sendData(event){
let clicked_button = document.activeElement;
if(clicked_button === null || clicked_button.getAttribute('type') !== 'submit' || clicked_button.parentElement != event.target){
console.log('ERROR: clicked_button not valid');
return;
}
if(clicked_button.getAttribute('value') !== 'add'){
return; // video(s) are being removed from playlist, just let it refresh the page
}
event.preventDefault();
let XHR = new XMLHttpRequest();
let FD = new FormData(playlistAddForm);
if(FD.getAll('video_info_list').length === 0){
displayMessage('Error: No videos selected', true);
return;
}
if(FD.get('playlist_name') === ""){
displayMessage('Error: No playlist selected', true);
return;
}
// https://stackoverflow.com/questions/48322876/formdata-doesnt-include-value-of-buttons
FD.append('action', 'add');
XHR.addEventListener('load', function(event){
if(event.target.status == 204){
displayMessage('Added videos to playlist "' + FD.get('playlist_name') + '"');
} else {
displayMessage('Error adding videos to playlist: ' + event.target.status.toString(), true);
}
});
XHR.addEventListener('error', function(event){
if(event.target.status == 0){
displayMessage('XHR failed: Check that XHR requests are allowed', true);
} else {
displayMessage('XHR failed: Unknown error', true);
}
});
XHR.open('POST', playlistAddForm.getAttribute('action'));
XHR.send(FD);
}
playlistAddForm.addEventListener('submit', sendData);
}());
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