1 files changed, 141 insertions, 0 deletions
diff --git a/library/fullcalendar/demos/js/theme-chooser.js b/library/fullcalendar/demos/js/theme-chooser.js
new file mode 100644
index 000000000..92a7c4753
--- /dev/null
+++ b/library/fullcalendar/demos/js/theme-chooser.js
@@ -0,0 +1,141 @@
+
+function initThemeChooser(settings) {
+  var isInitialized = false;
+  var currentThemeSystem; // don't set this directly. use setThemeSystem
+  var currentStylesheetEl;
+  var loadingEl = document.getElementById('loading');
+  var systemSelectEl = document.querySelector('#theme-system-selector select');
+  var themeSelectWrapEls = Array.prototype.slice.call( // convert to real array
+    document.querySelectorAll('.selector[data-theme-system]')
+  );
+
+  systemSelectEl.addEventListener('change', function() {
+    setThemeSystem(this.value);
+  });
+
+  setThemeSystem(systemSelectEl.value);
+
+  themeSelectWrapEls.forEach(function(themeSelectWrapEl) {
+    var themeSelectEl = themeSelectWrapEl.querySelector('select');
+
+    themeSelectWrapEl.addEventListener('change', function() {
+      setTheme(
+        currentThemeSystem,
+        themeSelectEl.options[themeSelectEl.selectedIndex].value
+      );
+    });
+  });
+
+
+  function setThemeSystem(themeSystem) {
+    var selectedTheme;
+
+    currentThemeSystem = themeSystem;
+
+    themeSelectWrapEls.forEach(function(themeSelectWrapEl) {
+      var themeSelectEl = themeSelectWrapEl.querySelector('select');
+
+      if (themeSelectWrapEl.getAttribute('data-theme-system') === themeSystem) {
+        selectedTheme = themeSelectEl.options[themeSelectEl.selectedIndex].value;
+        themeSelectWrapEl.style.display = 'inline-block';
+      } else {
+        themeSelectWrapEl.style.display = 'none';
+      }
+    });
+
+    setTheme(themeSystem, selectedTheme);
+  }
+
+
+  function setTheme(themeSystem, themeName) {
+    var stylesheetUrl = generateStylesheetUrl(themeSystem, themeName);
+    var stylesheetEl;
+
+    function done() {
+      if (!isInitialized) {
+        isInitialized = true;
+        settings.init(themeSystem);
+      }
+      else {
+        settings.change(themeSystem);
+      }
+
+      showCredits(themeSystem, themeName);
+    }
+
+    if (stylesheetUrl) {
+      stylesheetEl = document.createElement('link');
+      stylesheetEl.setAttribute('rel', 'stylesheet');
+      stylesheetEl.setAttribute('href', stylesheetUrl);
+      document.querySelector('head').appendChild(stylesheetEl);
+
+      loadingEl.style.display = 'inline';
+
+      whenStylesheetLoaded(stylesheetEl, function() {
+        if (currentStylesheetEl) {
+          currentStylesheetEl.parentNode.removeChild(currentStylesheetEl);
+        }
+        currentStylesheetEl = stylesheetEl;
+        loadingEl.style.display = 'none';
+        done();
+      });
+    } else {
+      if (currentStylesheetEl) {
+        currentStylesheetEl.parentNode.removeChild(currentStylesheetEl);
+        currentStylesheetEl = null
+      }
+      done();
+    }
+  }
+
+
+  function generateStylesheetUrl(themeSystem, themeName) {
+    if (themeSystem === 'bootstrap') {
+      if (themeName) {
+        return 'https://bootswatch.com/4/' + themeName + '/bootstrap.min.css';
+      }
+      else { // the default bootstrap theme
+        return 'https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css';
+      }
+    }
+  }
+
+
+  function showCredits(themeSystem, themeName) {
+    var creditId;
+
+    if (themeSystem.match('bootstrap')) {
+      if (themeName) {
+        creditId = 'bootstrap-custom';
+      }
+      else {
+        creditId = 'bootstrap-standard';
+      }
+    }
+
+    Array.prototype.slice.call( // convert to real array
+      document.querySelectorAll('.credits')
+    ).forEach(function(creditEl) {
+      if (creditEl.getAttribute('data-credit-id') === creditId) {
+        creditEl.style.display = 'block';
+      } else {
+        creditEl.style.display = 'none';
+      }
+    })
+  }
+
+
+  function whenStylesheetLoaded(linkNode, callback) {
+    var isReady = false;
+
+    function ready() {
+      if (!isReady) { // avoid double-call
+        isReady = true;
+        callback();
+      }
+    }
+
+    linkNode.onload = ready; // does not work cross-browser
+    setTimeout(ready, 2000); // max wait. also handles browsers that don't support onload
+  }
+}