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In this article, we will discuss some of the AngularJS features. You can follow this AngularJS cheat sheet to build your application. We’ve tried to cover Angular Filter, Services, Directives, Module, Global Functions and a lot more in this post.
Angular is a JavaScript front-end framework, which is used to develop web and mobile apps. As the name suggests, it is a declarative approach to developing an application. It is, therefore, different from other JavaScript frameworks like React, which is an application of higher-order JavaScript.
Filters
| Keyword | Uses |
| amount | currency[:symbol] | Formats a number as a currency (ie $1,234.56). |
| date | date[:format] | |
| array | filter:expression | Selects a subset of items from array. Expression takes string|Object|function() |
| data | json | Convert a JavaScript object into JSON string. |
| array | limitTo:limit | Creates a new array containing only a specified number of elements in an array. |
| text | linky 1 | Finds links in text input and turns them into html links. |
| string | lowercase | Converts string to lowercase. |
| number | number[:fractionSize] | Formats a number as text. If the input is not a number an empty string is returned. |
| array | orderBy:predicate[:reverse] | Predicate is function(*)|string|Array. Reverse is boolean |
| string | uppercase | Converts string to uppercase. |
| You can inject the $filter service and do $filter(‘filterName’)(value[, :optionalParam][, :optionalParam]) in use it in your javascript. 1 Requires ngSanitize Module | |
Services
| Keyword |
| $anchorScroll |
| $cacheFactory |
| compiledHtml = $compile(html)(scope) |
| $controller |
| $cookieStore |
| $document |
| $exceptionHandler(exception[, cause]) |
| $filter(name) |
| $http[(options)] |
| $httpBackend |
| $injector |
| $interpolate(text[, mustHaveExpression]) |
| $locale |
| $location |
| $log |
| $parse(expression) |
| $provide |
| $q |
| $resource(url[, paramDefaults][, actions]) |
| $rootElement |
| $rootScope |
| $route |
| $routeParams |
| $routeProvider |
| $sanitize(html) |
| $scope See $rootScope |
| $templateCache |
| $timeout(fn[, delay][, invokeApply]) |
| $window |
Directive Definition Object
| Keyword | Uses |
| name {string} | Name of the current scope. Optional defaults to the name at registration. |
| priority {integer} | Specifies order multiple directives apply on single DOM element (higher = first) |
| terminal {true} | Current priority will be last set of directives to execute |
| scope {true | object} | True – create child scope. Undefined|false – use parent scope. {} – isolate scope (with specified attributes/scope variables passed): @ or @attr – bind local model to value of DOM attribute (string), = or =attr – bi-directional binding between local model and the parent scope, & or &attr – execute an expression in context of parent. Reference attr OR assumes model of same name |
| controller function($scope, $element, $attrs, $transclude) | Controller constructor function instantiated before pre-linking phase and shared with other directives if requested by name |
| require {string | array[strings]} | Require another controller (ngModel). Prefixes: ? – Don’t raise error. ^ – Look on parent elements too |
| restrict {string: ‘EACM’} | E – Element: <my-directive />. A – Attribute (default): <div my-directive=”exp” />. C – Class: <div class=”my-directive: exp;” />. M – Comment: <!– directive: my-directive exp –> |
| template {string} | Replace current element with contents and migrates all attributes / classes |
| templateUrl {string} | Same as template but the template is loaded from the specified URL |
| replace {boolean} | true: template replaces element instead of appending |
| transclude {boolean} | Compiles contents on parent (pre-isolate) scope. Usually used with ngTransclude & templates. |
| compile function(tElement, tAttrs, fn transclude(function(scope, cloneLinkingFn) ) returns link() | For transforming the template (rare, run once per template instance). |
| link function(scope, iElement, iAttrs, controller) | Executed after template is cloned (run once per clone). Contains most logic (DOM listeners, etc). Controller can be an array. |
| http://docs.angularjs.org/guide/directive | |
Directives
Module
| Keyword | Uses |
| config(configFn) | Use this method to register work which needs to be performed on module loading. |
| constant(name, object) | Because the constant are fixed, they get applied before other provide methods. |
| controller(name, constructor) | |
| directive(name, directiveFactory) | |
| factory(name, providerFunction) | |
| filter(name, filterFactory) | |
| provider(name, providerType) | |
| run(initializationFn) | Use this method to register work which needs to be performed when the injector with with the current module is finished loading. |
| service(name, constructor) | value(name, object) |
| name | Name of the module. |
| Holds the list of modules which the injector will load before the current module is loaded. http://docs.angularjs.org/api/angular.Module | |
Scope Properties and Methods
| Keyword | Uses |
| $root or $rootScope | Move to the top-most $scope (ng-app) |
| $parent | Move to the immediate parent of the current $scope |
| $id | Auto generated Unique ID |
| $destroy (event) | Broadcasted when a scope and its children are being destroyed |
| $apply(exp) | Executes logic within the AngularJS context and refreshes all models checks. |
| $broadcast(name, args) | Dispatches an event name downwards to all child scopes |
| $destroy() | Removes the current scope (and all of its children) from the parent scope |
| $digest() | Process all of the watchers of the current scope and its children. Since watchers can change models, they will continue firing until all changes stop. BEWARE OF RECURSIVE CODE |
| $emit(name, args) | Dispatches an event name upwards through the scope hierarchy |
| $eval(expression) | Executes the expression on the current scope and returns the result |
| $evalAsync(expression) | Executes the expression on the current scope at a later point in time |
| $new(isolate) | Creates a new child scope |
| $on(name, listener) | Listens on events of a given type |
| $watch(watchExp, listener(newVal, oldVal, scope), objectEquality) | Watch a model (exp) for changes and fires the listener callback. Pass true as a third argument to watch an object’s properties too. |
| The following directives create child scopes: ngInclude, ngSwitch, ngRepeat, ngController, uiIf. Calls to the same ngController will create multiple instances and do not share scopes. Remember to traverse up the tree to affect primitives on the intended scope: ng-click=”$parent.showPage=true” | |
Global Functions
| Keyword | Uses | |
| angular.bind(self, fn, args) | Returns a function which calls function fn bound to self (self becomes the this for fn). | |
| angular.bootstrap(element[, modules]) | Use this function to manually start up angular application. | |
| angular.copy(source[, destination]) | Creates a deep copy of source, which should be an object or an array. | |
| angular.element(element) | Wraps a raw DOM element or HTML string as a jQuery element. | |
| angular.equals(o1, o2) | Determines if two objects or two values are equivalent. | |
| angular.extend(dst, src) | Extends the destination object dst by copying all of the properties from the src object(s) to dst. | |
| angular.forEach(obj, iterator[, context]) | Invokes the iterator function once for each item in obj collection, which can be either an object or an array. | |
| angular.fromJson(json) | Deserializes a JSON string. | |
| angular.identity() | A function that returns its first argument. This function is useful when writing code in the functional style. | |
| angular.injector(modules) | Creates an injector function that can be used for retrieving services as well as for dependency injection. | |
| angular.isArray(value) | Determines if a reference is an Array. | |
| angular.isDate(value) | Determines if a value is a date. | |
| angular.isDefined(value) | Determines if a reference is defined. | |
| angular.isElement(value) | Determines if a reference is a DOM element (or wrapped jQuery element). | |
| angular.isFunction(value) | Determines if a reference is a Function. | |
| angular.isNumber(value) | Determines if a reference is a Number. | |
| angular.isObject(value) | Determines if a reference is an Object. Unlike typeof in JavaScript, nulls are not considered to be objects. | |
| angular.isString(value) | Determines if a reference is a String. | |
| angular.isUndefined(value) | Determines if a reference is undefined. | |
| angular.lowercase(string) | Converts the specified string to lowercase. | |
| angular.mock | Namespace from ‘angular-mocks.js’ which contains testing related code. | |
| angular.module(name[, requires], configFn) | The angular.module is a global place for creating and registering Angular modules. Requires argument always creates a new module. | |
| angular.noop() | A function that performs no operations. | |
| angular.toJson(obj[, pretty]) | Serializes input into a JSON-formatted string. | |
| angular.uppercase(string) | Converts the specified string to uppercase. | |
| angular.version | An object that contains information about the current AngularJS version. |
FormController
</tr?
| Keyword |
| $pristine |
| $dirty |
| $valid |
| $invalid |
| $error |
| http://docs.angularjs.org/api/ng.directive:form.FormController |
NgModelController
| Keyword | Uses |
| $render() | Called when the view needs to be updated. It is expected that the user of the ng-model directive will implement this method. |
| $setValidity(validationErrorKey, isValid) | |
| $setViewValue(value) | |
| $viewValue | mixed |
| $modelValue | mixed |
| $parsers | array of function after reading val from DOM to sanitize / convert / validate the value |
| $formatters | array of functions to convert / validate the value |
| $error | object |
| $pristine | boolean |
| $dirty | boolean |
| $valid | boolean |
| $invalid | boolean |
| http://docs.angularjs.org/api/ng.directive:ngModel.NgModelController | |
Deferred and Promise
| Keyword | Uses |
| $q.all([array of promises]) | Creates a Deferred object which represents a task which will finish in the future. |
| $q. defer() | Creates a Deferred object which represents a task which will finish in the future. |
| $q.reject(reason) | Creates a promise that is resolved as rejected with the specified reason |
| $q.when(value) | Wraps an object that might be a value or a (3rd party) then-able promise into a $q promise |
| Deferred.resolve(value) | Resolves the derived promise with the value |
| Deferred.reject(reason) | Rejects the derived promise with the reason |
| Deferred.promise | Promise object associated with this deferred |
| Promise.then(successCallback, errorCallback) | |
| http://docs.angularjs.org/api/ng.$q | |
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