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jaws.js
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jaws.js
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// https://github.com/linkdata/jaws
var jaws = null;
var jawsIdPrefix = 'Jid.';
function jawsContains(a, v) {
return a.indexOf(String(v).trim().toLowerCase()) !== -1;
}
function jawsIsCheckable(v) {
return jawsContains(['checkbox', 'radio'], v);
}
function jawsHasSelection(v) {
return jawsContains(['text', 'search', 'url', 'tel', 'password'], v);
}
function jawsIsInputTag(v) {
return jawsContains(['input', 'select', 'textarea'], v);
}
function jawsIsTrue(v) {
return jawsContains(['true', 't', 'on', '1', 'yes', 'y', 'selected'], v);
}
function jawsGetName(e) {
var elem = e;
while (elem != null) {
var name = elem.getAttribute('name');
if (name == null && elem.tagName.toLowerCase() === 'button') {
name = elem.textContent;
}
if (name != null) {
return name.replaceAll('\t', ' ');
}
elem = elem.parentElement;
}
return e.id;
}
function jawsClickHandler(e) {
if (jaws instanceof WebSocket && e instanceof Event) {
e.stopPropagation();
var elem = e.target;
var val = jawsGetName(elem);
while (elem != null) {
if (elem.id.startsWith(jawsIdPrefix) && !jawsIsInputTag(elem.tagName)) {
val += "\t" + elem.id;
}
elem = elem.parentElement;
}
jaws.send("Click\t\t" + JSON.stringify(val) + "\n");
}
}
function jawsInputHandler(e) {
if (jaws instanceof WebSocket && e instanceof Event) {
e.stopPropagation();
var val;
var elem = e.currentTarget;
if (jawsIsCheckable(elem.getAttribute('type'))) {
val = elem.checked;
} else if (elem.tagName.toLowerCase() === 'option') {
val = elem.selected;
} else {
val = elem.value;
}
jaws.send("Input\t" + elem.id + "\t" + JSON.stringify(val) + "\n");
}
}
function jawsRemoving(topElem) {
var elements = topElem.querySelectorAll('[id^="' + jawsIdPrefix + '"]');
if (elements.length == 0) return;
var val = '';
for (var i = 0; i < elements.length; i++) {
if (i > 0) {
val += '\t';
}
val += elements[i].id;
}
jaws.send("Remove\t" + topElem.id + "\t" + JSON.stringify(val) + "\n");
}
function jawsAttach(elem) {
if (elem.hasAttribute("data-jawsname")) {
var name = elem.dataset.jawsname;
window.jawsNames[name] = elem.id;
if (elem.hasAttribute("data-jawsdata")) {
jawsVar(name, JSON.parse(elem.dataset.jawsdata), 'Set');
}
return;
}
if (jawsIsInputTag(elem.tagName)) {
elem.addEventListener('input', jawsInputHandler, false);
return;
}
elem.addEventListener('click', jawsClickHandler, false);
}
function jawsAttachChildren(topElem) {
topElem.querySelectorAll('[id^="' + jawsIdPrefix + '"]').forEach(jawsAttach);
return topElem;
}
function jawsAlert(data) {
var lines = data.split('\n');
var type = lines.shift();
var message = lines.join('\n');
if (typeof bootstrap !== 'undefined') {
var alertsElem = document.getElementById('jaws-alerts');
if (alertsElem) {
var wrapper = document.createElement('div');
wrapper.innerHTML = '<div class="alert alert-' + type + ' alert-dismissible" role="alert">' + message +
'<button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button></div>';
alertsElem.append(wrapper);
return;
}
}
console.log("jaws: " + type + ": " + message);
}
function jawsList(idlist) {
var i;
var elements = [];
var idstrings = idlist.split(' ');
for (i = 0; i < idstrings.length; i++) {
var elem = document.getElementById(idstrings[i]);
if (elem) {
elem.dataset.jidsort = i;
elements.push(elem);
}
}
elements.sort(function (a, b) {
return +a.dataset.jidsort - +b.dataset.jidsort;
});
for (i = 0; i < elements.length; i++) {
delete elements[i].dataset.jidsort;
}
return elements;
}
function jawsOrder(idlist) {
var i;
var elements = jawsList(idlist);
for (i = 0; i < elements.length; i++) {
elements[i].parentElement.appendChild(elements[i]);
}
}
function jawsSetValue(elem, str) {
var elemtype = elem.getAttribute('type');
if (jawsIsCheckable(elemtype)) {
elem.checked = jawsIsTrue(str);
return;
}
if (elem.tagName.toLowerCase() === 'option') {
elem.selected = jawsIsTrue(str);
return;
}
if (elem.tagName.toLowerCase() === 'textarea') {
if (elem.textContent != str) {
elem.textContent = str;
// work around browser bug where textContent
// and textLength go out of sync sometimes
if (elem.textLength != elem.textContent.length) {
var parent = elem.parentNode;
var clone = document.createElement(elem.tagName);
for (var i = 0; i < elem.attributes.length; i++) {
clone.setAttribute(elem.attributes[i].nodeName, elem.attributes[i].nodeValue);
}
clone.textContent = str;
parent.insertBefore(clone, elem);
elem.remove();
jawsAttach(clone);
}
}
return;
}
if (elem.value == str) {
return;
}
if (jawsHasSelection(elemtype)) {
var ss = elem.selectionStart;
var se = elem.selectionEnd;
var oldVal = elem.value;
var delta = str.indexOf(oldVal);
elem.value = str;
if (delta == -1) {
delta = oldVal.indexOf(str);
if (delta == -1) return;
delta = -delta;
}
elem.selectionStart = ss + delta;
elem.selectionEnd = se + delta;
return;
}
elem.value = str;
}
function jawsLost() {
var delay = 1;
var innerHTML = 'Server connection lost';
if (jaws instanceof Date) {
var elapsed = Math.floor((new Date() - jaws) / 1000);
if (elapsed > 0) {
var units = ' second';
delay = elapsed;
if (elapsed >= 60) {
delay = 60;
units = ' minute';
elapsed = Math.floor(elapsed / 60);
if (elapsed >= 60) {
units = ' hour';
elapsed = Math.floor(elapsed / 60);
}
}
if (elapsed > 1) units += 's';
innerHTML += ' ' + elapsed + units + ' ago';
}
}
innerHTML += '. Trying to reconnect.';
var elem = document.getElementById('jaws-lost');
if (elem == null) {
elem = jawsElement('<div id="jaws-lost" class="jaws-alert">' + innerHTML + '</div>');
document.body.prepend(elem);
document.body.scrollTop = document.documentElement.scrollTop = 0;
} else {
elem.innerHTML = innerHTML;
}
setTimeout(jawsReconnect, delay * 1000);
}
function jawsHandleReconnect(e) {
if (e.currentTarget.readyState == 4) {
if (e.currentTarget.status == 204) {
window.location.reload();
} else {
jawsLost();
}
}
}
function jawsReconnect() {
var req = new XMLHttpRequest();
req.open("GET", window.location.protocol + "//" + window.location.host + "/jaws/.ping", true);
req.addEventListener('readystatechange', jawsHandleReconnect);
req.send(null);
}
function jawsFailed(e) {
if (jaws instanceof WebSocket) {
jaws = new Date();
jawsReconnect();
}
}
function jawsUnloading() {
if (jaws instanceof WebSocket) {
jaws.removeEventListener('close', jawsFailed);
jaws.removeEventListener('error', jawsFailed);
jaws.close();
jaws = null;
}
}
function jawsElement(html) {
var template = document.createElement('template');
template.innerHTML = html;
return template.content;
}
function jawsWhere(elem, pos) {
var where = null;
if (pos && pos !== 'null') {
where = document.getElementById(pos);
if (where == null) {
where = elem.children[parseInt(pos)];
}
}
if (!(where instanceof Node)) {
console.log("jaws: id " + elem.id + " has no position " + pos);
}
return where;
}
function jawsInsert(elem, data) {
var idx = data.indexOf('\n');
var where = jawsWhere(elem, data.substring(0, idx));
if (where instanceof Node) {
elem.insertBefore(jawsAttachChildren(jawsElement(data.substring(idx + 1))), where);
}
}
function jawsSetAttr(elem, data) {
var idx = data.indexOf('\n');
elem.setAttribute(data.substring(0, idx), data.substring(idx + 1));
}
function jawsMessage(e) {
var orders = e.data.split('\n');
var i;
for (i = 0; i < orders.length; i++) {
if (orders[i]) {
var parts = orders[i].split('\t');
jawsPerform(parts.shift(), parts.shift(), parts.shift());
}
}
}
function jawsVar(name, data, operation) {
var keys = name.split('.');
if (keys.length > 0) {
var obj = window;
var lastkey = keys[keys.length - 1];
var i;
for (i = 0; i < keys.length - 1; i++) {
if (!obj.hasOwnProperty(keys[i])) {
throw "jaws: object undefined: " + name;
}
obj = obj[keys[i]];
}
switch (operation) {
case undefined:
if (data === undefined) {
data = obj[lastkey];
} else {
obj[lastkey] = data;
}
break;
case 'Call':
data = obj[lastkey](data);
break;
case 'Set':
if (typeof obj[lastkey] !== 'function') {
obj[lastkey] = data;
}
return data;
default:
throw "jaws: unknown operation: " + operation;
}
if (jaws instanceof WebSocket && jaws.readyState === 1) {
jaws.send("Set\t" + window.jawsNames[name] + "\t" + JSON.stringify(data) + "\n");
}
return data;
}
}
function jawsPerform(what, id, data) {
data = JSON.parse(data);
switch (what) {
case 'Reload':
window.location.reload();
return;
case 'Redirect':
window.location.assign(data);
return;
case 'Alert':
jawsAlert(data);
return;
case 'Order':
jawsOrder(data);
return;
}
var elem = document.getElementById(id);
if (elem === null) {
throw "jaws: element not found: " + id;
}
var where = null;
switch (what) {
case 'Inner':
jawsRemoving(elem);
elem.innerHTML = data;
jawsAttachChildren(elem);
return;
case 'Value':
jawsSetValue(elem, data);
return;
case 'Append':
elem.appendChild(jawsAttachChildren(jawsElement(data)));
return;
case 'Replace':
jawsRemoving(elem);
elem.replaceWith(jawsAttachChildren(jawsElement(data)));
return;
case 'Delete':
jawsRemoving(elem);
elem.remove();
return;
case 'Remove':
where = jawsWhere(elem, data);
if (where instanceof Node) {
jawsRemoving(where);
elem.removeChild(where);
}
return;
case 'Insert':
jawsInsert(elem, data);
return;
case 'SAttr':
jawsSetAttr(elem, data);
return;
case 'RAttr':
elem.removeAttribute(data);
return;
case 'SClass':
elem.classList.add(data);
return;
case 'RClass':
elem.classList.remove(data);
return;
case 'Set':
case 'Call':
jawsVar(elem.dataset.jawsname, data, what);
return;
}
throw "jaws: unknown operation: " + what;
}
function jawsPageshow(e) {
if (e.persisted) {
window.location.reload();
}
}
function jawsConnect() {
var wsScheme = 'ws://';
if (window.location.protocol === 'https:') {
wsScheme = 'wss://';
}
window.jawsNames = {};
window.addEventListener('beforeunload', jawsUnloading);
window.addEventListener('pageshow', jawsPageshow);
jaws = new WebSocket(wsScheme + window.location.host + '/jaws/' + encodeURIComponent(jawsKey));
jaws.addEventListener('open', function () { jawsAttachChildren(document); });
jaws.addEventListener('message', jawsMessage);
jaws.addEventListener('close', jawsFailed);
jaws.addEventListener('error', jawsFailed);
}
if (document.readyState === 'complete' || document.readyState === 'interactive') {
jawsConnect();
} else {
window.addEventListener('DOMContentLoaded', jawsConnect);
}