});
+// We need {{attr '@name'}} because Handlebars can't parse {{@name}}
+Handlebars.registerHelper('attr', function(attrName) {
+ return this[attrName];
+});
+
+
+/*
+ * Use as follows: {{#if-any NAME1 having="NAME2"}}
+ * Applicable when NAME1 is the name of an array
+ * The guarded code runs only if at least one element of the NAME1
+ * array has a subelement called NAME2.
+ */
+Handlebars.registerHelper('if-any', function(items, options) {
+ var having = options.hash.having;
+ for (var i in items) {
+ var item = items[i]
+ if (!having || item[having]) {
+ return options.fn(this);
+ }
+ }
+ return "";
+});
+
+
Handlebars.registerHelper('first', function(items, options) {
- return options.fn(items[0]);
+ var having = options.hash.having;
+ for (var i in items) {
+ var item = items[i]
+ if (!having || item[having]) {
+ return options.fn(item);
+ }
+ }
+ return "";
});