Started a jQuery utilities file for Ghost jQuery plugins and helpers

ghost/admin/assets/lib/jquery-utils.js

@@ -0,0 +1,40 @@
+// # Ghost jQuery Utils
+
+/*global window, document, $ */
+
+(function () {
+    "use strict";
+
+    // UTILS
+
+    /**
+     * Allows to check contents of each element exactly
+     * @param obj
+     * @param index
+     * @param meta
+     * @param stack
+     * @returns {boolean}
+     */
+    $.expr[":"].containsExact = function (obj, index, meta, stack) {
+        return (obj.textContent || obj.innerText || $(obj).text() || "") === meta[3];
+    };
+
+    /**
+     * Center an element to the window vertically and centrally
+     * @returns {*}
+     */
+    $.fn.center = function () {
+        this.css({
+            'position': 'fixed',
+            'left': '50%',
+            'top': '50%'
+        });
+        this.css({
+            'margin-left': -this.outerWidth() / 2 + 'px',
+            'margin-top': -this.outerHeight() / 2 + 'px'
+        });
+
+        return this;
+    };
+
+}());