angular Factory for String Format , so you can use .Net String Format Mode in your Angular javascript file. based on : https://github.com/ST-Software/Scripts/blob/master/Angular%20Modules/src/stringFormatterModule.js

angular-stringFormat.js

angular.module('myApp.stringFormat',[])
    .factory('stringFormat', function () {

        var stringFormat = {};
        stringFormat.formatString = function(format,values){
            var result = '';

            for (var i = 0; ; ) {
                // Find the next opening or closing brace
                var open = format.indexOf('{', i);
                var close = format.indexOf('}', i);
                if ((open < 0) && (close < 0)) {
                    // Not found: copy the end of the string and break
                    result += format.slice(i);
                    break;
                }
                if ((close > 0) && ((close < open) || (open < 0))) {

                    if (format.charAt(close + 1) !== '}') {
                        throw new Error('format stringFormatBraceMismatch');
                    }

                    result += format.slice(i, close + 1);
                    i = close + 2;
                    continue;
                }

                // Copy the string before the brace
                result += format.slice(i, open);
                i = open + 1;

                // Check for double braces (which display as one and are not arguments)
                if (format.charAt(i) === '{') {
                    result += '{';
                    i++;
                    continue;
                }

                if (close < 0) throw new Error('format stringFormatBraceMismatch');

                // Find the closing brace

                // Get the string between the braces, and split it around the ':' (if any)
                var brace = format.substring(i, close);
                var colonIndex = brace.indexOf(':');
                var argNumber = parseInt((colonIndex < 0) ? brace : brace.substring(0, colonIndex), 10);

                if (isNaN(argNumber)) throw new Error('format stringFormatInvalid');

                var argFormat = (colonIndex < 0) ? '' : brace.substring(colonIndex + 1);

                var arg = values[argNumber];
                if (typeof (arg) === "undefined" || arg === null) {
                    arg = '';
                }

                // If it has a toFormattedString method, call it.  Otherwise, call toString()
                if (arg.format) {
                    result += arg.format(argFormat);
                } else
                    result += arg.toString();

                i = close + 1;
            }

            return result;
        }

        return stringFormat;
    });