disqus-lazy_load-1508786-5_fit_in_other_patches.patch

diff --git a/disqus.admin.inc b/disqus.admin.inc
index 94a2346..2a1016b 100644
--- a/disqus.admin.inc
+++ b/disqus.admin.inc
@@ -195,6 +195,45 @@ function disqus_admin_settings() {
       ),
     ),
   );
+  $form['advanced']['lazy_loading'] = array(
+    '#weight' => 6,
+    '#type' => 'fieldset',
+    '#title' => t('Lazy Loading'),
+    '#collapsible' => FALSE,
+    '#collapsed' => FALSE,
+  );
+  $form['advanced']['lazy_loading']['disqus_lazy_load'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Use Lazy Loading'),
+    '#description' => t('Prevent the Disqus script from loading until triggered by user activity.'),
+    '#default_value' => variable_get('disqus_lazy_load', 0),
+  );
+  $form['advanced']['lazy_loading']['disqus_lazy_load_method'] = array(
+    '#type' => 'select',
+    '#title' => t('Lazy Loading Trigger'),
+    '#description' => t('The type of user activity used to determine when the Disqus script is loaded.'),
+    '#default_value' => variable_get('disqus_lazy_load_method', DISQUS_LAZY_LOAD_ON_SCROLL),
+    '#options' => array(
+      DISQUS_LAZY_LOAD_ON_SCROLL => t('When the Disqus block scrolls into view'),
+      DISQUS_LAZY_LOAD_ON_CLICK => t('When the user clicks on an HTML element'),
+    ),
+    '#states' => array(
+      'visible' => array(
+        'input[name="disqus_lazy_load"]' => array('checked' => TRUE),
+      ),
+    ),
+  );
+  $form['advanced']['lazy_loading']['disqus_lazy_load_class'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Triggering Class'),
+    '#description' => t('The HTML class of the elements that trigger the lazy loading.'),
+    '#default_value' => variable_get('disqus_lazy_load_class', 'disqus-lazy-load'),
+    '#states' => array(
+      'visible' => array(
+        'select[name="disqus_lazy_load_method"]' => array('value' => DISQUS_LAZY_LOAD_ON_CLICK),
+      ),
+    ),
+  );
   // Make sure the validation is called to handle the custom sso logo.
   $form['#submit'][] = 'disqus_admin_settings_submit';
   return system_settings_form($form);
diff --git a/disqus.install b/disqus.install
index e4eeb37..cca05c3 100644
--- a/disqus.install
+++ b/disqus.install
@@ -51,6 +51,9 @@ function disqus_uninstall() {
     'disqus_developer',
     'disqus_domain',
     'disqus_inherit_login',
+    'disqus_lazy_load',
+    'disqus_lazy_load_class',
+    'disqus_lazy_load_method',
     'disqus_localization',
     'disqus_location',
     'disqus_logo',
diff --git a/disqus.js b/disqus.js
index 7332e3f..1dce7c2 100644
--- a/disqus.js
+++ b/disqus.js
@@ -15,11 +15,32 @@ var disqus_config;
 
 (function ($) {
 
+Drupal.disqus = {
+  loadCommentScript: function (shortname) {
+    // Make the AJAX call to get the Disqus comments.
+    this.loadScript(shortname, 'embed.js')
+  },
+  loadCountScript: function (shortname) {
+    // Make the AJAX call to get the number of comments.
+    this.loadScript(shortname, 'count.js');
+  },
+  loadScript: function (shortname, scriptName) {
+    $.ajax({
+      type: 'GET',
+      url: '//' + shortname + '.disqus.com/' + scriptName,
+      dataType: 'script',
+      cache: false
+    });
+  }
+};
+
 /**
  * Drupal Disqus behavior.
  */
 Drupal.behaviors.disqus = {
   attach: function (context, settings) {
+    var disqus = Drupal.disqus;
+
     $('body').once('disqus', function() {
       // Load the Disqus comments.
       if (settings.disqus || false) {
@@ -54,7 +75,7 @@ Drupal.behaviors.disqus = {
                 for (var j = 0; j < callback.length; j++) {
                   fn = fn[callback[j]];
                 }
-                if(typeof fn === 'function') {
+                if (typeof fn === 'function') {
                   this.callbacks[key].push(fn);
                 }
               }
@@ -63,24 +84,34 @@ Drupal.behaviors.disqus = {
         };
 
         // Make the AJAX call to get the Disqus comments.
-        jQuery.ajax({
-          type: 'GET',
-          url: '//' + disqus_shortname + '.disqus.com/embed.js',
-          dataType: 'script',
-          cache: false
-        });
+        if (settings.disqus.lazyLoadMethod || '') {
+          switch (settings.disqus.lazyLoadMethod) {
+            case 'click':
+              $('.' + (settings.disqus.lazyLoadClass || ''))
+                .css('cursor', 'pointer')
+                .bind('click', function (event) {
+                  $(event.currentTarget).remove();
+                  disqus.loadCommentScript(disqus_shortname);
+                });
+              break;
+            case 'scroll':
+              $(window).scroll(function scrollHandler(event) {
+                if ($(window).scrollTop() + $(window).height() > $('#disqus_thread').offset().top) {
+                  disqus.loadCommentScript(disqus_shortname);
+                  $(window).unbind('scroll', scrollHandler);
+                }
+              });
+              break;
+          }
+        }
+        else {
+          disqus.loadCommentScript(disqus_shortname);
+        }
       }
 
       // Load the comment numbers JavaScript.
       if (settings.disqusComments || false) {
-        disqus_shortname = settings.disqusComments;
-        // Make the AJAX call to get the number of comments.
-        jQuery.ajax({
-          type: 'GET',
-          url: '//' + disqus_shortname + '.disqus.com/count.js',
-          dataType: 'script',
-          cache: false
-        });
+        disqus.loadCountScript(settings.disqusComments);
       }
     });
   }
diff --git a/disqus.module b/disqus.module
index 2b80720..4bf61ba 100644
--- a/disqus.module
+++ b/disqus.module
@@ -21,6 +21,16 @@ define('DISQUS_API_CLOSE', 1);
 define('DISQUS_API_REMOVE', 2);
 
 /**
+ * Lazy load the Disqus script when the Disqus comment block becomes visible.
+ */
+define('DISQUS_LAZY_LOAD_ON_SCROLL', 0);
+
+/**
+ * Lazy load the Disqus script when an element is clicked.
+ */
+define('DISQUS_LAZY_LOAD_ON_CLICK', 1);
+
+/**
  * Implements hook_help().
  */
 function disqus_help($path, $arg) {
@@ -101,7 +111,7 @@ function disqus_closewindow() {
 function disqus_element_info() {
   $types['disqus'] = array(
     '#disqus' => array(),
-    '#theme_wrappers' => array('disqus_noscript', 'container'),
+   '#theme_wrappers' => array('disqus_noscript', 'disqus_lazy_load', 'container'),
     '#attributes' => array('id' => 'disqus_thread'),
     '#post_render' => array('disqus_element_post_render'),
   );
@@ -144,6 +154,10 @@ function disqus_element_post_render($children, &$element) {
     $disqus += disqus_sso_disqus_settings($user);
   }
 
+  if (variable_get('disqus_lazy_load', FALSE)) {
+    $disqus += disqus_lazy_load_settings();
+  }
+
   /**
    * Pass callbacks on if needed. Callbacks array is two dimensional array
    * with callback type as key on first level and array of JS callbacks on the
@@ -759,6 +773,9 @@ function disqus_theme() {
     'disqus_noscript' => array(
       'variables' => array('disqus' => NULL),
     ),
+    'disqus_lazy_load' => array(
+      'variables' => array('children' => NULL),
+    ),
   );
 }
 
@@ -779,6 +796,24 @@ function theme_disqus_noscript($variables = array()) {
 }
 
 /**
+ * Prepares the comment load prompt when lazy loading is enabled.
+ *
+ * @param $variables
+ *   An array containing a "children" element, which may contain
+ *   rendered content.
+ *
+ * @return string
+ */
+function theme_disqus_lazy_load($variables) {
+  if (variable_get('disqus_lazy_load', FALSE) && variable_get('disqus_lazy_load_method', '') == DISQUS_LAZY_LOAD_ON_CLICK) {
+    return '<p class="disqus-lazy-load">' . t('View the discussion thread.') . '</p>' . $variables['children'];
+  }
+  else {
+    return $variables['children'];
+  }
+}
+
+/**
  * Implements hook_libraries_info().
  */
 function disqus_libraries_info() {
@@ -922,6 +957,14 @@ function disqus_variable_info($options) {
         'default' => '',
         'group' => 'disqus'
     );
+    $variable['disqus_lazy_load'] = array(
+        'type' => 'string',
+        'title' => t('Lazy Load'),
+        'description' => t('Prevent the Disqus script from loading until triggered by user activity.'),
+        'default' => '',
+        'group' => 'disqus'
+    );
+
     return $variable;
 }
 
@@ -986,6 +1029,27 @@ function disqus_sso_disqus_settings($account = NULL) {
 }
 
 /**
+ * Assembles data about lazy loading.
+ *
+ * @return array
+ */
+function disqus_lazy_load_settings() {
+  $data = array();
+
+  switch (variable_get('disqus_lazy_load_method', NULL)) {
+    case DISQUS_LAZY_LOAD_ON_SCROLL:
+      $data['lazyLoadMethod'] = 'scroll';
+      break;
+    case DISQUS_LAZY_LOAD_ON_CLICK:
+      $data['lazyLoadClass'] = check_plain(variable_get('disqus_lazy_load_class', 'disqus-lazy-load'));
+      $data['lazyLoadMethod'] = 'click';
+      break;
+  }
+
+  return $data;
+}
+
+/**
  * Assembles the full private key for use in SSO authentication.
  *
  * @param array $data