new Angular Truncate Filter, that supports Legacy version from Umbraco Forms, plus updated code for even prettier truncated content.

src/Umbraco.Web.UI.Client/src/common/filters/truncate.filter.js

@@ -4,28 +4,52 @@
  * @namespace truncateFilter
  * 
  * param {any} wordwise if true, the string will be cut after last fully displayed word.
- * param {any} max max length of the outputtet string
- * param {any} tail option tail, defaults to: ' ...'
- *
+ * param {any} max where to cut the string.
+ * param {any} tail option tail, defaults to: '…'
+ * 
+ * Legacy version:
+ * parameter noOfChars(wordwise) Where to cut the string.
+ * parameter appendDots(max) If true dots will be appended in the end.
+ * 
  * @description
  * Limits the length of a string, if a cut happens only the string will be appended with three dots to indicate that more is available.
  */
 angular.module("umbraco.filters").filter('truncate', 
     function () {
         return function (value, wordwise, max, tail) {
+            
             if (!value) return '';
+            
+            // Overload-fix to support Forms Legacy Version:
+            if (typeof(wordwise) !== 'boolean') {
+                // switch arguments around to fit Forms version.
+                if (max !== true) {
+                    tail = '';
+                }
+                max = wordwise;
+                wordwise = false;
+            }
+            // !end of overload fix.
+            
             max = parseInt(max, 10);
             if (!max) return value;
             if (value.length <= max) return value;
-
+            
+            tail = (!tail && tail !== '') ? '…' : tail;
+            
+            if (wordwise && value.substr(max, 1) === ' ') {
+                max++;
+            }
             value = value.substr(0, max);
+            
             if (wordwise) {
                 var lastspace = value.lastIndexOf(' ');
-                if (lastspace != -1) {
-                    value = value.substr(0, lastspace);
+                if (lastspace !== -1) {
+                    value = value.substr(0, lastspace+1);
                 }
             }
-            return value + (tail || (wordwise ? ' …' : '…'));
+            
+            return value + tail;
         };
     }
 );