AngularJS: Factory, Service and Provider

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Tallerconcepts & Angularjs

AngularJS: Factory, Service and Provider

Introduction:

AngularJS is a powerful JavaScript framework which is widely used for SPA (Single Page Application) projects. The library of this framework is written in JavaScript and distributes as a JavaScript file which can be added into a webpage by using script tag. It extends the HTML DOM with additional attributes and allows the pages to become more responsive to user actions. AngularJS library is completely free, open source and very much popular JavaScript library among all. The library is being used by thousands of developers and applications as well.

In AngularJS, there are some keywords used for different purposes such as Controllers, Service, Factory and Provider etc. The controller is used to handle the connection, request and responses made through your application and must be light. It means most of the persistent data and business logic of your application must be stored in a service. Services in AngularJS holds the data around for the application lifetime and can be easily accessed through different controllers. AngularJS library offers developers with three different ways to register their own services – Factory, Service and Provider.

Services:

The syntax for a service is as follows:

app.service(‘serviceName’, function() {});

AngularJS instantiates services in the background of your application with a ‘new’ keyword. This is why developers can use the property ‘this’ and the relevant service will return the expected value of ‘this’. If you pass the service into your controller then all the properties and attributes of ‘this’ will now be available on that controller through your defined service.

When you are declaring serviceName as an injectable argument then you’ll be provided with the instance of a function passed to app.service. The services of AngularJS could be useful while sharing utility function that are useful to invoke by simply appending () to the injected reference of a function.

Factories:

The syntax for factories in AngularJS is as follows:

app.factory(‘factoryName’, function() {} );

You simply create an object when you are using a factory. It means you add properties and attributes to it and then return the same object. When you pass your factory object into your controller then all the defined attributes and properties on the object will now be available in that controller through your defined factory.

When your are declaring factoryName as an injectable argument then you’ll be provided the value that is returned by calling the function reference passed to app.factory. These factories could be useful for returning a ‘class’ function that can then be ready to generate an instance using ‘new’ keyword.

Providers:

The syntax for providers in AngularJS is as follows:

app.provider(‘providerName’, function() {

});

app.config(function (providerNameProvider) {

// define your config here for this provider

});

The providers in AngularJS is the only service which can be passed into your .config() function. It exposes the API for the application-wide configuration that must be prepared before the start of your application. The providers are used when developer want to provide module-wide configuration for a service object before making it available.

Conclusion:

The single page applications are composed to objects that collaborate to get request response done as expected for end-users. All these objects must be instantiated when they required and wired together in order to function properly. In AngularJS so far we learn that these objects are instantiated and wired together automatically by a variety of injector services such as Services, Factories and Providers. The applications developed using AngularJs library are very much lighter and highly responsive for your targeted users.

AngularJs Forms

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         AngularJs Forms – creation, submission and validation

Tallerconcepts & Angularjs

Introduction:

The developers were already submitting and validating forms before AngularJS came out in the market. There are a number of ways available to submit a form and lots of ways to validate it as well. AngularJS has always strived to offer tools to manipulate form in an easier way. A form can be easily validated and submitted using Ajax forms and AngularJS built-in validation functionalities. There are also third-party modules available to help developers to deal with forms such as angular-formly. In this article, we’ll explain the complete walkthrough of creating, validating and submitting a form in AngularJs.

Form and controls provide validation services for end users so that they can be notified of invalid input before submitting a form. It offers a better user experience than server side validation as the user gets instant feedback on how to correct input errors. Keep in mind that, the server side validation is more secure than client side validation.

These are the steps developers should follow to deal with AngularJs forms:

Create a form: In this section, we’ll understand how we can create a form in AngularJS and set their different properties as well. The form creation in Angular is similar to any other language and can have all the existing form input types. The example below has an input type inside a form in which end users provide their values.

<form name=”formExample” role=”form” novalidate>

<div class=”form-group” >

<label>Username</label>

<input name=”username” type=”text” maxLength=10 class=”form-control” data-ng-model=”formData.username” id=”username” placeholder=”Username” required>

</div>

</form>

In this example, we are using a single text box type input for the username. The ng-model property is used to display data fetched from the backend.

Validate form: AngularJS offers some basic implementation for all input types such as text, number, email, date, URL, checkbox and radio buttons, as well as some directives for a variety of validations such as pattern, minlength, maxlength, required, min and max etc.

 

<div class=”form-group” ng-class=”{ ‘has-error’ : submitted && formExample.username.$invalid }”>

<label>Username</label>

<input name=”username” type=”text” ng-minlength=”3″ ng-maxlength=”8″ class=”form-control” data-ng-model=”formData.username” id=”username” placeholder=”Username” required>

<div ng-show=”submitted && formExample.username.$invalid” class=”help-block”>

<p ng-show=”formExample.username.$error.required”>Username is required</p>

<p ng-show=”formExample.username.$error.minlength” class=”help-block”>Username is too short.</p>

<p ng-show=”formExample.username.$error.maxlength” class=”help-block”>Username is too long.</p>

</div>

</div>

In the above example, the same form field is validated for minimum and maximum length for username field.

 

  1. Form submission: In AngularJS, you can submit a form in two different ways –
  1. Using ng-submit attribute on the form element and
  2. Using a button element with ng-click attribute

In both the above submission methods, a JavaScript function is invoked on the $scope object. The developers can attach this JavaScript function to the $scope object in your controller. The data from your form element must be sent to your server through AJAX.

 

$http.post(‘/form’,$scope.formData).

then(function(response) {

//success response

$scope.submittedData.push(response.data)

$scope.formData = {};

$scope.submitted = false;

alert(“The form was posted to the httpBackend”)

}, function(response) {

//error response

});

The alternate way to submit a form to the server is using resource property of AngularJs. An example of such submission will be as follows:

 

var Forms = $resource(‘/form’);

Forms.save($scope.formData, function(data){

$scope.submittedData.push(data)

$scope.formData = {};

$scope.submitted = false;

alert(“The form was posted to the httpBackend”)

});
Conclusion: So this is a simple way to create, validate and submit a form in AngularJs. The library is dedicated to simplifying the handling of forms for developers as much as possible. There are some third party libraries also available that can be used for handling form for your application. The validation at the front end is not as secure as backend validation as it can be compromised in user’s system using few lines of codes.

 

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Java vs Javascript

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java vs javascript

Java vs Javascript – which one is better

Both Java and Javascript are two strong languages, which are often considered as distant cousins by programmers and developers who are new to programming and web development. It has always been a part of debate that out of these which one is better than another. And, an accurate answer could not be found because both Java and Javascript are best in their own worlds despite the fact both can be used for the same purpose, for example, in creation of websites.

There are several similarities in both while there are many differences as well. For example,

  • Both are Object Oriented Programming languages. Java is a programming language while JavaScript is a scripting language.
  • While programing structures are similar in both, JavaScript becomes a winner among average programmers because it has much smaller and simpler commands than Java.
  • Both can be used to create similar programs and generate same results on the web but the amount of work required is less in JavaScript than Java.
  • Java has Applets, which make it standalone but JavaScript has to be used within an html page to function, which means it is not standalone, but its execution is fast.
  • Java is a winner in mobile devices, apps, and at many places that do not even require interference of a webpage but JavaScript needs a webpage running on a browser that can interpret JavaScript.

As you see both have their own distinct features while having some similarities, now a days, JavaScript is taking over Java when it comes to Web.

Let us see the advantages of JavaScript:

  • One of the main advantage of JavaScript is it is easy to understand, and even a newbie  programmer / developer can easily get hold on its commands’ set while Java is not that easy to understand.
  • With JavaScript, one can easily create web page events using its event handlers, which can be used along with existing HTML code.
  • Both Java and JavaScript are used to create interactive webpages by setting up an interaction between the user and the web but both works differently. Java is rigid while JavaScript offers more freedom per object creation and execution.
  • The code you write using JavaScript works for both Server and the browser making it easier for you to migrate it from one to another. For example, you have developed code for the browser but there is a requirement to move that on the server arises; you can easily do it, and there are maximum chances that the same JavaScript code will work in the browser and on the server. However, in case of Java, you will have to write two different codes.
  • JavaScript is the need of an hour for modern websites including banking websites, e-commerce websites, and so on. And, this is the reason, all modern browser support JavaScript – be it on a PC or a mobile phone. JavaScript is a winner on the Web.
  • JavaScript has JSON, which many web services and databases use to return data, but in case of Java, there are libraries used as JSON parser adding extra weightage to the code’s execution.

Here you see, both have their own advantages, but on the web, in terms of simplicity, speed, and functionalities, JavaScript is a winner.

MySQL vs MongoDB

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TallerConcepts MongoDB MySQL

MySQL vs MongoDB what is the difference?

MySQL is a well-known open-source relational database administration, management system (RDBMS) that is produced, appropriated and supported by Oracle Corporation. Like other databases, MySQL stores information in tables and uses organized inquiry dialect (SQL) for database access. In MySQL, you pre-characterize your database construction taking into account your prerequisites and set up standards to represent the connections between fields in your tables and whereas MongoDB is an open-source database created by MongoDB, Inc. MongoDB stores information in JSON-like records that can shift in structure. Related data is put away together for quick inquiry access through the MongoDB question dialect. MongoDB utilizes dynamic diagrams, implying that you can make records without first characterizing the structure, for example, the fields or the sorts of their qualities. You can change the structure of records (which we call reports) just by including new fields or erasing existing ones.

Associations of all sizes are receiving MongoDB in light of the fact that it empowers them to manufacture applications speedier, handle exceptionally different information sorts and oversee applications all the more proficiently at scale. Improvement is disentangled as MongoDB archives outline to current, article situated programming dialects. Utilizing MongoDB uproots the mind-boggling article social mapping (ORM) layer that makes an interpretation of items in code to social tables.

MongoDB’s adaptable information display additionally implies that your database mapping can develop with business prerequisites. For instance, the ALTER TABLE summon required to include a solitary, new field to Craigslist’s MySQL database would take months to execute. The Craigslist group moved to MongoDB in light of the fact that it can suit changes to the information model without such exorbitant pattern relocations.

MongoDB can likewise be scaled inside and over different appropriated server farms, giving new levels of accessibility and versatility beforehand unachievable with social databases like MySQL. As your organizations develop as far as information volume and throughput, MongoDB scales effortlessly with no downtime, and without changing your application. Interestingly, to accomplish scale with MySQL regularly requires critical, custom designing work.

The huge contrast in the middle of SQL and MongoDB’s inquiry dialect is that the last is not a solitary string “sentence.” It doesn’t require white spaces in the middle of words, or commas, or enclosures, or cited characters. Rather, MongoDB utilizes a “course” of administrator/operand structures, normally in the name: value sets. As it were, the operand in one structure can be another administrator/operand structure. This makes things extremely energizing for engineers in light of the fact that the same strategies we use in our code to control rich states of information going into and leaving MongoDB – whether it’s Java, Python, JavaScript, and so forth – can be utilized to develop, control, and “parse” our question expressions. Truth be told, no parser is essential. It is unimportant simple to walk the course with standard programming methods and discover fields, values, and so on. Since the inquiry expression is an organized course and not a solitary string, this likewise implies it is anything but difficult to incrementally add sub-expressions to the question without first breaking it separated into segment pieces.

AngularJS “1.x to 2.x”

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Tallerconcepts & Angularjs

The migration from AngularJS 1.x to AngularJS 2.x has opened a whole new world of possibilities for frontend development here at Taller Concepts. Our core principal of Being Taller means we offer services that are head and shoulders above the rest. Included in that promise is staying on the forefront of coding developments. When the Google Team announced that they would be upgraded from 1.x to 2.x, Taller Concepts ensured we are on the forefront of development by relishing the change. We did not see this change as a challenge. Other developers were not pleased that 2.x would be incompatible with 1.x. We, however, were excited by the new world of possibilities. We chose to look at the change as a fresh start with a horizon of endless opportunities. Innovation excites rather than frightens us.

While Google did release news of 1.5.x, an intermediary release which will allow a smoother transition between 1.x and 2.x, some people still saw concerns which promoted Google to release more information including a simple guide and a unique AngularJS library. Inside developers went so far as to announce that the ng-upgrade and Angular 2 would be in the existing Angular 1 app, to help users “mix and match,” according to Softpedia.

Developers here at Taller Concepts think the differences between 1.x and 2.x are interested. The hard and new developments that 2.x presents are electrifying. We are prepared to weather the projected storm of the transitional phase with positive attitudes, innovated approaches, and an optimistic outlook. We love the adventure that AngularJS 2.x promises. At times frontend development feels like the Wild West or the new frontier of the digital revolution, and that is what we love about the speed and agility of changes in the coding world. Taller Concepts keeps pace with things like the migration from 1.x to 2.x because we look forward to updates and new models of coding, just as the people who fared well in Wild West or on harsh seas. We look forward to change, rather than shying away from it. Where others see potential problems, we see opportunities for revolution.

Taller Concepts also likes some of the features of AngularJS 2.x because they align with our other two core principles: partnership and belief. At various conferences presenters have introduced a suite of benchmarks which showed AngularJS 2.x as approximately two times faster and three times more efficient in memory usage than 1.x. We like double the speed and triple the efficiency. We will extract the maximum benefits of those upgrades for the organizations we partner with by presenting them with a high quality, visually stunning, and unforgettable online experience.

NodeJS – “Should of had a V8”

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Taller Concepts & NodeJS

Built on Google Chrome’s V8, Node.js is JavaScript runtime for backend coding. Here at Taller Concepts we know you should’ve had a V8, no mess about it. Just as the V8 cylinder is built for speed and performance, the Chrome V8 platform and Node.js language are meant for applications and website that are ready to run. Another benefit is that Node.js is open source, which allows multiple users to interact with and tweak it: “Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js’ package ecosystem, npm, is the largest ecosystem of open source libraries in the world,” according to nodejs.org.

Taller Concepts uses Node.js and similar frameworks because we don’t want the inefficiency of thread-based networks to slow us or our services down. We run fast, just like the V8 many people wished they had. Instead of wishing and hoping for something faster and more efficient, we at Taller Concepts get right to work with the best platforms available to save time and productivity. One of the things that makes Node.js so fast and efficient is the lack of start-the-event loop calls, like in other platforms. Instead, Node.js gets right to work, just like the partners at Taller Concepts, where both height and speed factor into our decision-making processes. We don’t have time to slow down with start-the-event loop calls and other redundancies.

We hit the ground running and rev our V8 engine-like imaginations and skill sets. TNW News touted Node.js as the “the cool new kid on the JavaScript block” and the 4.0 version as “finally stable.” Since that article, which appeared in September, Node.js is now completely stable and ready to ramp up the development world. TNW continued by explaining, “It also brings first-class support for ARM processors for the first time, and the Node foundation has built an extensive testing suite to ensure it works consistently across Linux, Windows, FreeBSD, SmartOS and ARM devices.” Taller Concepts will use that consistency across platforms to build all of our web services including website design, website hosting, e-commerce, cloud computing, branding, SEO, app development, and more. With the consistency across multiple browsers and systems, anything and everything we build for our customers will offer consistent, pleasant, and reliable experiences for users, whether they are logging on from a computer, tablet, smartphone, or other device. With the power and speed of V8’s Node.js on our side, we dominate the development landscape and zoom past our competition to put our clients first and foremost.