diff --git a/playground/html/root/cangrow.js b/playground/html/root/cangrow.js
new file mode 100644
index 0000000..becf034
--- /dev/null
+++ b/playground/html/root/cangrow.js
@@ -0,0 +1,35 @@
+function toggleDisplay(id) {
+  let el = document.getElementById(id);
+  let el_cs = getComputedStyle(el);
+  
+  if (el_cs.getPropertyValue('display') === 'none') {
+    el.style.display = 'inline';
+  } else {
+    el.style.display = 'none';
+  }
+} 
+
+function hideAllClass(classname) {
+  
+  const el = document.getElementsByClassName(classname);
+  
+  for(let i = 0; i < el.length ; i++) {
+    el[i].style.display = '';
+  }
+}
+
+function showSelect(selectId, prefix, hideClass = '') {
+  if(hideClass != '') {
+    hideAllClass(hideClass);
+  }
+  
+  let selVal = document.getElementById(selectId).value;
+  toggleId = prefix + selVal;
+  if(document.getElementById(toggleId) !== null ) {
+    toggleDisplay(toggleId);
+  }
+}
+
+function confirmDelete(name) {
+  return confirm('Delete ' + name + '?');
+}