TruncateFilter.js

// add the filter to your application module
angular.module('yourAppName', ['filters']);

/**
 * Truncate Filter
 * @Param string
 * @Param int, default = 10
 * @Param string, default = "..."
 * @return string
 */
angular.module('filters', []).
    filter('truncate', function () {
        return function (text, length, end) {
            if (isNaN(length))
                length = 10;

            if (end === undefined)
                end = "...";

            if (text.length <= length || text.length - end.length <= length) {
                return text;
            }
            else {
                return String(text).substring(0, length-end.length) + end;
            }

        };
    });


/**
 * Example - see the jsfiddle: http://jsfiddle.net/tUyyx/
 *
 * var myText = "This is an example.";
 *
 * {{myText|truncate}}
 * {{myText|truncate:5}}
 * {{myText|truncate:25:" ->"}}
 * 
 * Output
 * "This is..."
 * "Th..."
 * "This is an e ->"
 *
 */