1 files changed, 32 insertions, 0 deletions

diff --git a/assets_src/js/lib/dom.js b/assets_src/js/lib/dom.js
index 33845af..bfbeea7 100644
--- a/assets_src/js/lib/dom.js
+++ b/assets_src/js/lib/dom.js
@@ -5,10 +5,42 @@ export function ready(fn) {
 }
 
 export function closest(el, fn) {
+        if (!el) {
+                return null;
+        }
         while (el) {
                 if (fn(el)) {
                         return el;
                 }
                 el = el.parentNode
         }
+        return null;
+}
+
+export function next(el, fn) {
+        if (!el) {
+                return null;
+        }
+        el = el.nextSibling;
+        while (el) {
+                if (fn(el)) {
+                        return el;
+                }
+                el = el.nextSibling;
+        }
+        return null;
+}
+
+export function previous(el, fn) {
+        if (!el) {
+                return null;
+        }
+        el = el.previousSibling;
+        while (el) {
+                if (fn(el)) {
+                        return el;
+                }
+                el = el.previousSibling;
+        }
+        return null;
 }