Archive: Namaste PHP AMQP framework v1.0 (2017-2020)

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html/js/modules (optional)/jquery.jsticky.js

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+/* jSticky Plugin
+ * =============
+ * Author: Andrew Henderson (@AndrewHenderson)
+ * Date: 9/7/2012
+ * Update: 02/14/2013
+ * Website: http://github.com/andrewhenderson/jsticky/
+ * Description: A jQuery plugin that keeps select DOM
+ * element(s) in view while scrolling the page.
+ */
+
+;(function($) {
+
+  $.fn.sticky = function(options) {
+
+    var defaults = {
+        topSpacing: 0, // No spacing by default
+        zIndex: '', // No default z-index
+        stopper: '.sticky-stopper' // Default stopper class, also accepts number value
+      },
+      settings = $.extend({}, defaults, options); // Accepts custom stopper id or class
+
+    // Checks if custom z-index was defined
+    function checkIndex() {
+
+      if (typeof settings.zIndex == 'number') {
+        return true;
+      } else {
+        return false;
+      }
+    }
+    var hasIndex = checkIndex(); // True or false
+
+    // Checks if a stopper exists in the DOM or number defined
+    function checkStopper() {
+
+      if ( 0 < $(settings.stopper).length || typeof settings.stopper === 'number' ) {
+        return true;
+      } else {
+        return false;
+      }
+    }
+    var hasStopper = checkStopper(); // True or false
+
+    return this.each(function() {
+
+      var $this          = $(this),
+          thisHeight     = $this.outerHeight(),
+          thisWidth      = $this.outerWidth(),
+          topSpacing     = settings.topSpacing,
+          zIndex         = settings.zIndex,
+          pushPoint      = $this.offset().top - topSpacing, // Point at which the sticky element starts pushing
+          placeholder    = $('<div></div>').width(thisWidth).height(thisHeight).addClass('sticky-placeholder'), // Cache a clone sticky element
+          stopper        = settings.stopper,
+          $window        = $(window);
+
+      function stickyScroll() {
+
+        var windowTop  = $window.scrollTop(); // Check window's scroll position
+        
+        if ( hasStopper && typeof stopper === 'string' ) {
+          var stopperTop = $(stopper).offset().top,
+              stopPoint  = (stopperTop - thisHeight) - topSpacing;
+        } else if (hasStopper && typeof stopper === 'number') {
+          var stopPoint = stopper;
+        }
+
+        if (pushPoint < windowTop) {
+          // Create a placeholder for sticky element to occupy vertical real estate
+          $this.after(placeholder).css({
+            position: 'fixed',
+            top: topSpacing
+          });
+          
+          if (hasIndex) {
+            $this.css({ zIndex: zIndex });
+          }
+
+          if (hasStopper) {
+            if (stopPoint < windowTop) {
+              var diff = (stopPoint - windowTop) + topSpacing;
+              $this.css({ top: diff });
+            }
+          }
+        } else {
+          $this.css({
+            position: 'static',
+            top: null,
+            left: null
+          });
+
+          placeholder.remove();
+        }
+      };
+
+      $window.bind("scroll", stickyScroll);
+    });
+  };
+})(jQuery);