luci-base: rework ui tabbing code

 - Instantiate tab menus on the client side
 - Simplify server side markup generation
 - Show error indicators in cbi tabs

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

2 files changed, 180 insertions, 74 deletions

diff --git a/modules/luci-base/htdocs/luci-static/resources/cbi.js b/modules/luci-base/htdocs/luci-static/resources/cbi.js
index 635740a70c..61b83e8294 100644
--- a/modules/luci-base/htdocs/luci-static/resources/cbi.js
+++ b/modules/luci-base/htdocs/luci-static/resources/cbi.js
@@ -12,7 +12,6 @@
 */
 
 var cbi_d = [];
-var cbi_t = [];
 var cbi_strings = { path: {}, label: {} };
 
 function s8(bytes, off) {
@@ -727,13 +726,13 @@ function cbi_d_update() {
 			parent.parentNode.style.display = (parent.options.length <= 1) ? 'none' : '';
 	}
 
-	if (entry && entry.parent) {
-		if (!cbi_t_update())
-			cbi_tag_last(parent);
-	}
+	if (entry && entry.parent)
+		cbi_tag_last(parent);
 
 	if (state)
 		cbi_d_update();
+	else if (parent)
+		parent.dispatchEvent(new CustomEvent('dependency-update', { bubbles: true }));
 }
 
 function cbi_init() {
@@ -1045,75 +1044,6 @@ function cbi_dynlist_init(dl, datatype, optional, choices)
 cbi_dynlist_init.prototype = CBIDynamicList;
 
 
-function cbi_t_add(section, tab) {
-	var t = document.getElementById('tab.' + section + '.' + tab);
-	var c = document.getElementById('container.' + section + '.' + tab);
-
-	if (t && c) {
-		cbi_t[section] = (cbi_t[section] || [ ]);
-		cbi_t[section][tab] = { 'tab': t, 'container': c, 'cid': c.id };
-	}
-}
-
-function cbi_t_switch(section, tab) {
-	if (cbi_t[section] && cbi_t[section][tab]) {
-		var o = cbi_t[section][tab];
-		var h = document.getElementById('tab.' + section);
-
-		for (var tid in cbi_t[section]) {
-			var o2 = cbi_t[section][tid];
-
-			if (o.tab.id != o2.tab.id) {
-				o2.tab.classList.remove('cbi-tab');
-				o2.tab.classList.add('cbi-tab-disabled');
-				o2.container.style.display = 'none';
-			}
-			else {
-				if(h)
-					h.value = tab;
-
-				o2.tab.classList.remove('cbi-tab-disabled');
-				o2.tab.classList.add('cbi-tab');
-				o2.container.style.display = 'block';
-			}
-		}
-	}
-
-	return false;
-}
-
-function cbi_t_update() {
-	var hl_tabs = [ ];
-	var updated = false;
-
-	for (var sid in cbi_t)
-		for (var tid in cbi_t[sid]) {
-			var t = cbi_t[sid][tid].tab;
-			var c = cbi_t[sid][tid].container;
-
-			if (!c.firstElementChild) {
-				t.style.display = 'none';
-			}
-			else if (t.style.display == 'none') {
-				t.style.display = '';
-				t.classList.add('cbi-tab-highlighted');
-				hl_tabs.push(t);
-			}
-
-			cbi_tag_last(c);
-			updated = true;
-		}
-
-	if (hl_tabs.length > 0)
-		window.setTimeout(function() {
-			for (var i = 0; i < hl_tabs.length; i++)
-				hl_tabs[i].classList.remove('cbi-tab-highlighted');
-		}, 750);
-
-	return updated;
-}
-
-
 function cbi_validate_form(form, errmsg)
 {
 	/* if triggered by a section removal or addition, don't validate */
diff --git a/modules/luci-base/htdocs/luci-static/resources/luci.js b/modules/luci-base/htdocs/luci-static/resources/luci.js
index c1c1b0dd3c..4cb8bf4e5d 100644
--- a/modules/luci-base/htdocs/luci-static/resources/luci.js
+++ b/modules/luci-base/htdocs/luci-static/resources/luci.js
@@ -181,6 +181,175 @@
 		}
 	};
 
+	/* Tabs */
+	LuCI.prototype.tabs = {
+		init: function() {
+			var groups = [], prevGroup = null, currGroup = null;
+
+			document.querySelectorAll('[data-tab]').forEach(function(tab) {
+				var parent = tab.parentNode;
+
+				if (!parent.hasAttribute('data-tab-group'))
+					parent.setAttribute('data-tab-group', groups.length);
+
+				currGroup = +parent.getAttribute('data-tab-group');
+
+				if (currGroup !== prevGroup) {
+					prevGroup = currGroup;
+
+					if (!groups[currGroup])
+						groups[currGroup] = [];
+				}
+
+				groups[currGroup].push(tab);
+			});
+
+			for (var i = 0; i < groups.length; i++)
+				this.initTabGroup(groups[i]);
+
+			document.addEventListener('dependency-update', this.updateTabs.bind(this));
+
+			this.updateTabs();
+
+			if (!groups.length)
+				this.setActiveTabId(-1, -1);
+		},
+
+		initTabGroup: function(panes) {
+			if (!Array.isArray(panes) || panes.length === 0)
+				return;
+
+			var menu = E('ul', { 'class': 'cbi-tabmenu' }),
+			    group = panes[0].parentNode,
+			    groupId = +group.getAttribute('data-tab-group'),
+			    selected = null;
+
+			for (var i = 0, pane; pane = panes[i]; i++) {
+				var name = pane.getAttribute('data-tab'),
+				    title = pane.getAttribute('data-tab-title'),
+				    active = pane.getAttribute('data-tab-active') === 'true';
+
+				menu.appendChild(E('li', {
+					'class': active ? 'cbi-tab' : 'cbi-tab-disabled',
+					'data-tab': name
+				}, E('a', {
+					'href': '#',
+					'click': this.switchTab.bind(this)
+				}, title)));
+
+				if (active)
+					selected = i;
+			}
+
+			group.parentNode.insertBefore(menu, group);
+
+			if (selected === null) {
+				selected = this.getActiveTabId(groupId);
+
+				if (selected < 0 || selected >= panes.length)
+					selected = 0;
+
+				menu.childNodes[selected].classList.add('cbi-tab');
+				menu.childNodes[selected].classList.remove('cbi-tab-disabled');
+				panes[selected].setAttribute('data-tab-active', 'true');
+
+				this.setActiveTabId(groupId, selected);
+			}
+		},
+
+		getActiveTabState: function() {
+			var page = document.body.getAttribute('data-page');
+
+			try {
+				var val = JSON.parse(window.sessionStorage.getItem('tab'));
+				if (val.page === page && Array.isArray(val.groups))
+					return val;
+			}
+			catch(e) {}
+
+			window.sessionStorage.removeItem('tab');
+			return { page: page, groups: [] };
+		},
+
+		getActiveTabId: function(groupId) {
+			return +this.getActiveTabState().groups[groupId] || 0;
+		},
+
+		setActiveTabId: function(groupId, tabIndex) {
+			try {
+				var state = this.getActiveTabState();
+				    state.groups[groupId] = tabIndex;
+
+			    window.sessionStorage.setItem('tab', JSON.stringify(state));
+			}
+			catch (e) { return false; }
+
+			return true;
+		},
+
+		updateTabs: function(ev) {
+			document.querySelectorAll('[data-tab-title]').forEach(function(pane) {
+				var menu = pane.parentNode.previousElementSibling,
+				    tab = menu.querySelector('[data-tab="%s"]'.format(pane.getAttribute('data-tab'))),
+				    n_errors = pane.querySelectorAll('.cbi-input-invalid').length;
+
+				if (!pane.firstElementChild) {
+					tab.style.display = 'none';
+					tab.classList.remove('flash');
+				}
+				else if (tab.style.display === 'none') {
+					tab.style.display = '';
+					requestAnimationFrame(function() { tab.classList.add('flash') });
+				}
+
+				if (n_errors) {
+					tab.setAttribute('data-errors', n_errors);
+					tab.setAttribute('data-tooltip', _('%d invalid field(s)').format(n_errors));
+					tab.setAttribute('data-tooltip-style', 'error');
+				}
+				else {
+					tab.removeAttribute('data-errors');
+					tab.removeAttribute('data-tooltip');
+				}
+			});
+		},
+
+		switchTab: function(ev) {
+			var tab = ev.target.parentNode,
+			    name = tab.getAttribute('data-tab'),
+			    menu = tab.parentNode,
+			    group = menu.nextElementSibling,
+			    groupId = +group.getAttribute('data-tab-group'),
+			    index = 0;
+
+			ev.preventDefault();
+
+			if (!tab.classList.contains('cbi-tab-disabled'))
+				return;
+
+			menu.querySelectorAll('[data-tab]').forEach(function(tab) {
+				tab.classList.remove('cbi-tab');
+				tab.classList.remove('cbi-tab-disabled');
+				tab.classList.add(
+					tab.getAttribute('data-tab') === name ? 'cbi-tab' : 'cbi-tab-disabled');
+			});
+
+			group.childNodes.forEach(function(pane) {
+				if (L.dom.matches(pane, '[data-tab]')) {
+					if (pane.getAttribute('data-tab') === name) {
+						pane.setAttribute('data-tab-active', 'true');
+						L.tabs.setActiveTabId(groupId, index);
+					}
+					else {
+						pane.setAttribute('data-tab-active', 'false');
+					}
+
+					index++;
+				}
+			});
+		}
+	};
+
 	/* DOM manipulation */
 	LuCI.prototype.dom = {
 		elem: function(e) {
@@ -316,6 +485,11 @@
 		}
 	};
 
+	/* Setup */
+	LuCI.prototype.setupDOM = function(ev) {
+		this.tabs.init();
+	};
+
 	function LuCI(env) {
 		this.env = env;
 
@@ -329,6 +503,8 @@
 		document.addEventListener('mouseout', this.hideTooltip.bind(this), true);
 		document.addEventListener('focus', this.showTooltip.bind(this), true);
 		document.addEventListener('blur', this.hideTooltip.bind(this), true);
+
+		document.addEventListener('DOMContentLoaded', this.setupDOM.bind(this));
 	}
 
 	window.LuCI = LuCI;