Merge pull request #2 from stargate/add-tab-blocks

add tabs codeblock ui

src/css/site.css

@@ -16,3 +16,4 @@
 @import "highlight.css";
 @import "print.css";
 @import "typeface-nunito.css";
+@import "tabs.css";

src/css/tabs.css

@@ -0,0 +1,72 @@
+.tabset {
+  margin-bottom: 20px;
+  margin-top: 20px;
+}
+
+.tabs ul {
+  display: flex;
+  flex-wrap: wrap;
+  list-style: none;
+  margin: 0 -0.25rem 0 0;
+  padding: 0;
+}
+
+.tabs li {
+  align-items: center;
+  border-bottom: 0;
+  border: 1px solid #808080;
+  cursor: pointer;
+  display: flex;
+  font-weight: bold;
+  height: 2.5rem;
+  line-height: 1;
+  margin-right: 0.25rem;
+  padding: 0 1.5rem;
+  position: relative;
+}
+
+.tabs.ulist li {
+  margin-bottom: 0;
+  border-top-left-radius: 3px;
+  border-top-right-radius: 3px;
+}
+
+.tabs li + li {
+  margin-top: 0;
+}
+
+.tabset.is-loading .tabs li:not(:first-child),
+.tabset:not(.is-loading) .tabs li:not(.is-active) {
+  background-color: #fafafa;
+  color: #8e8e8e;
+  font-weight: normal;
+}
+
+.tabset.is-loading .tabs li:first-child::after,
+.tabs li.is-active::after {
+  background-color: white;
+  content: "";
+  display: block;
+  height: 3px; /* Chrome doesn't always paint the line accurately, so add a little extra */
+  position: absolute;
+  bottom: -1.5px;
+  left: 0;
+  right: 0;
+}
+
+.tabset > .content {
+  border: 1px solid gray;
+  padding: 1.25rem;
+  border-bottom-left-radius: 3px;
+  border-bottom-right-radius: 3px;
+  border-top-right-radius: 3px;
+}
+
+.tabset.is-loading .tab-pane:not(:first-child),
+.tabset:not(.is-loading) .tab-pane:not(.is-active) {
+  display: none;
+}
+
+.tab-pane > :first-child {
+  margin-top: 0;
+}

src/js/06-tabs-block.js

@@ -0,0 +1,50 @@
+;(function () {
+  'use strict'
+
+  var hash = window.location.hash
+  find('.tabset').forEach(function (tabset) {
+    var active
+    var tabs = tabset.querySelector('.tabs')
+    if (tabs) {
+      var first
+      find('li', tabs).forEach(function (tab, idx) {
+        var id = (tab.querySelector('a[id]') || tab).id
+        if (!id) return
+        var pane = getPane(id, tabset)
+        if (!idx) first = { tab: tab, pane: pane }
+        if (!active && hash === '#' + id && (active = true)) {
+          tab.classList.add('is-active')
+          if (pane) pane.classList.add('is-active')
+        } else if (!idx) {
+          tab.classList.remove('is-active')
+          if (pane) pane.classList.remove('is-active')
+        }
+        tab.addEventListener('click', activateTab.bind({ tabset: tabset, tab: tab, pane: pane }))
+      })
+      if (!active && first) {
+        first.tab.classList.add('is-active')
+        if (first.pane) first.pane.classList.add('is-active')
+      }
+    }
+    tabset.classList.remove('is-loading')
+  })
+
+  function activateTab (e) {
+    var tab = this.tab
+    var pane = this.pane
+    find('.tabs li, .tab-pane', this.tabset).forEach(function (it) {
+      it === tab || it === pane ? it.classList.add('is-active') : it.classList.remove('is-active')
+    })
+    e.preventDefault()
+  }
+
+  function find (selector, from) {
+    return Array.prototype.slice.call((from || document).querySelectorAll(selector))
+  }
+
+  function getPane (id, tabset) {
+    return find('.tab-pane', tabset).find(function (it) {
+      return it.getAttribute('aria-labelledby') === id
+    })
+  }
+})()