If you have not already heard. Ionic 3 is already released which comes with Angular 4 support and many features. So in this post I'll show you quickly how you can easily upgrade to Ionic 3 and Angular 4. Don't worry ,Ionic 3 is not a completely new rewritten framework as it was the case with Ionic 2. The reason behind this version of Ionic 3 is the compatibility with Angular 4 which introduces new features ,newest version of TypeScript but most importantly ,Angular 4 produces faster and smaller apps.
You can read more about this on Angular 4 official blog. Upgrading your project to Ionic 3 is actually very easy. All you need to do is updating your package.
Wait until the new dependencies are installed and then continue with these changes which are mainly related to Angular 4. Now you need to check you have Ionic 3 successfully installed so go ahead inside your project folder and run. Ionic 3. To upgrade your project to this version ,follow these steps.
First make sure you have upgraded your project to Ionic 3. You can use ionic info to check if Ionic framework is upgraded to the latest version successfully. So that is all you need to upgrade your project to use Ionic 3 instead of Ionic 2. See your on the next posts. You can read more about this on Angular 4 official blog Ionic 3 has also introduced some changes in project structure but they are optional.
Ionic 3 has a lot of great features : The lazy loading of modules. IonicPage decorator for setting up deep links ,etc. How to upgrade to Ionic 3? Sponsored Links. Let's stay connected!This Ionic 4 Angular 6 tutorial starts by displaying an invoice on the page with export to PDF file button. Before moving to the steps, make sure you have installed the latest Node. To check it, type this command in the terminal or Node. Next, go to the newly created app folder.
For sanitizing, run the app on the browser for the first time to make sure everything working properly. Now, the browser will open automatically then you will see this Ionic 4 Lab page.
Next, we have to install and configure Ionic 4 Cordova Native File Opener plugin by type this commands first. As we mention at the beginning of this article, we have to create an invoice page that printable or exportable to PDF file. Because we are using the Native plugin of Ionic 4 and Cordova, we should run on Device of Simulator to make the plugin working.
Type this command to add Cordova platform. You can find the working source code in our GitHub. We know that building beautifully designed Ionic apps from scratch can be frustrating and very time-consuming. Check Ionic 4 - Full Starter App and save development and design time. That just the basic. If you need more deep learning about Ionic, Angular, and Typescript, you can take the following cheap course:.
Programming Blog ASP. All Articles.API calls, using HttpClient module, are asynchronous by nature since you need to wait for the response to come from the remote servers without blocking the app when still waiting. The Promise object represents the eventual completion or failure of an asynchronous operation, and its resulting value.
You place your async actions, either when the promise has successfully resolved or failed, within the. Image source. For example you can cancel an observable whenever you need without using external libraries as the case for promises and you can also have multiple return values. Unlike promises, which they can only handle single events, observables, on the other hand, can be passed more than one event.
An Observable can be represented as a stream of events that can be handled with the same API and they can be cancelable this feature is not available for ES6 Promises so you need to use external libraries to do that. You can use different array-like operators such as mapforEachand reduce etc.
The new Angular HttpClient methods return observables objects which can be also converted to promises using toPromise operator so you can use the right abstraction when it's appropriate.
A service provider is an Angular abstraction which can be used in any other component, page or service via the Angular Dependency Injection or DI. You can use providers to encapsulate code which's common between many places of your application so instead of repeating the same logic in many places you can isolate that code into its own service and inject it wherever you want to use it.
If you don't know what DRY is, here is its definition from Wikipedia. In software engineering, don't repeat yourself DRY is a principle of software development aimed at reducing repetition of software patterns, replacing them with abstractions; and several copies of the same data, using data normalization to avoid redundancy.
By following the DRY principle you place the code which interfaces with your back-end API in one place which makes the app easy maintainable. Head back to your terminal or command prompt then run the following command to generate a service provider. Based on the endpoints exposed by our simple json-server back-end, we can create an example implementation of our Angular service. We have imported the Injectable decorator to transform this TypeScript class into an injectable service.
Next we have declared the baseUrl variable to hold the address of your back-end API. Next we injected HttpClient as httpClient. Before you can succesfully implement the service methods, you need to make sure to import the following dependencies from the RxJS library:.
You also need to declare and define a Product model, either in the same file as the service or in a separate file then import it:. The getProducts method will be used to get all products from the corresponding API endpoint:. We first call the. The createProduct method will be used to create a new product by sending a POST request, with the product data, to the corresponding endpoint.
The updateProduct will be used to update a product by its idby sending a PUT request to the corresponding endpoint then will convert the response to a new Product using the RxJS.
After implementing the service to interface with our REST back-end, let's now see how to use the service in our app. Calling any method in our components won't send any HTTP requests. We need to subscribe to the returned Observable to send the corresponding request to the API back-end. To subscribe to an Observable, we need to use the. Then we call this code, to get all products and store them in the products array, when the view enters or in the constructor:.
This method simply subscribes to the corresponding method in the service and concatenates the newly created product with the products array. This method the array. What's a Promise? Promises can be chained together to handle complex scenarios Image source What is an Observable?
Generating a Service Provider A service provider is an Angular abstraction which can be used in any other component, page or service via the Angular Dependency Injection or DI.For a major version upgrade, the transition from Ionic 3 to Ionic 4 is going to be relatively minor. Most of your code will be able to remain as is, with some minor syntax changes due to the upgrade to Angular 6 and the web component approach in Ionic 4. The amount of time it takes to upgrade is going to depend a lot on your application, but I would estimate for most people it would take on average anywhere from 1 hour to 8 hours to upgrade most applications.
If you intend to switch to using the Angular router which is recommended you could probably double that estimate.
This article will just be covering the method that I have been using to upgrade my applications from Ionic 3 to Ionic 4. It has been working well for me, and maybe it will suit you too. However, make sure you also check out the official migration guide. If you need more general background information about Ionic 4, you should also check out my Ionic 4 Migration Survival Guide.
I will create a fresh new application using the latest tooling and then copy over code bit by bit making modifications as required until my application works on the new version. I think this approach is especially suitable for upgrading from Ionic 3 to Ionic 4. There have been very few changes in terms of the APIs and syntax you will be using, but there have been significant changes to the overall project structure and behind the scenes stuff.
Therefore, a lot of the stuff that needs to be changed is taken care of for you by creating a new application, and there are only minor changes required when copy and pasting your old code into the new project. I find that with this approach you are going to be much less likely to run into weird errors that ultimately end up being caused by some obscure configuration or missing dependency.
I see it as the slow and steady approach. It might be quicker to make upgrades in place in your existing application if everything goes well, but there is a higher chance that you will mess something up.
In this article, I am going to be walking through the exact step-by-step approach I have been using to update Ionic 3 applications to Ionic 4. There are some aspects of the approach I have been using that you may find a little weird, but it works for me, so feel free to modify this approach to suit your own workflow. First, make sure that you have the latest version of the Ionic CLI installed and create a new Ionic 4 application.
As I mentioned, Ionic 4 is not officially out yet, so for most people, I would recommend waiting until Ionic actually announces something before actually doing this. The project structure in Ionic 4 has changed. Most notably, your entire application will now live inside of the app folder, rather than just the root component. Rather than manually recreating or copying your existing folders over, I recommend using the CLI to recreate your project structure.
This way, you can be confident that the structure is correct. Bring up your old application in a new window, and explore your project structure. For each pageprovidercomponentpipeand so on that you see, run the appropriate generate command in your new application:.
Once you have completed this step, you should have recreated your old project structure in the format required for Ionic 4. Open up the package. You can do this either by pasting the dependencies into the package. You should only install dependencies that you have added to the project e. If you are missing required dependencies, when you test your project later you will run into errors saying that a particular module cannot be found. When this happens, you will know you are missing a dependency and you can install it then.
This avoids installing pointless packages in your application, or worse, installing dependencies that are going to conflict with your project. If you simply replace the new files with your old files, especially for your TypeScript files, you are going to have your imports and the structure of the class messed up. Instead, what I like to do is copy and paste the files from my old project alongside their counterparts in the new project.Improve this doc.
Ionic is built on top of Angular, which is a complete rewrite of the original framework. All the parts of Angular you know are still there, but there are new syntax and structural changes about which developers need to be aware.
For an overview of the changes in Angular, take a look at Learn Angular. In Ionic, things should feel quite familiar. All the concepts from Ionic v1 are still in the latest versions, though they may look slightly different. You still have views and controllers like you did in v1, but they have been merged into one instance. Other changes, like navigation changes, are much different, but for good reasons, we promise. Now, you can treat components as arbitrary views and navigate to them any way you want to.
Need help upgrading to Ionic Framework 4. Log in Sign up. Ionic 5 is here! Take this v1 example.Although it will look slightly different, the code that you are using in Ionic 3 will more or less look the same in Ionic 4. The most significant change, and one that may require a little more thought is the move to Angular routing.
If you are not already familiar with using Angular routing in Ionic 4 I would recommend reading these articles first for a bit of background:. There are also other significant benefits to using Angular routing:. In this tutorial, we are going to look at a hypothetical scenario of creating routes for an existing Ionic 3 application.
We will consider an application with a typical structure, and discuss how to create the routes for the application in Ionic 4, and how navigation would need to be modified. I intend to keep this tutorial reasonably high level, so if you are not already familiar with Angular routing in a general sense, I would recommend reading the two articles I linked above.
At its core, a route is responsible for indicating which component in your application needs to be activated. The active route is determined by whatever path is present in the URL. In our application we will have some routes defined as follows e. This is just a simple application that has two pages. In the case that no path is supplied in the URL, e. The first route will be matched, which simply redirects to the home route.
The home route would also be activated by going to:. Each route will have an associated component i. Since we will generally be using lazy loading, we use the loadChildren property instead of component because we want to load the pages module file rather than the page component itself. Navigation in the application is achieved by switching between these URL paths. You could name all of your routes like this:. As long as each page you want to switch to has a route you will be able to navigate to it.
We should take the time to give our application a sensical route structure so that the application is easier to develop and maintain, and so that it is more useful to users. It helps to have a big picture understanding of the structure of your application.
The example we are going to walk through will look like this:. We then have three main pages which are productsaboutand support. The products page will also be able to activate a detail page and a category page. The support page will be able to launch the ticket page as a modal. As I mentioned, each page we want to display in the router needs its own route, so each of the pages in the diagram above should have its own route.
Since we are going to be launching the ticket page as a modal from the support page, we will not be creating a route for it. Given the structure of the diagram, at first glance you might visualise the paths for the routes like this:. You certainly could do that if you wanted, but the home in every URL is a bit redundant. We might then change it to this instead:. This is pretty good, but since our detail page is going to display details for specific products, we are going to pass the id of the product to the detail page.
Instead of having a static route we would change it to accept a parameter:.
Again, if you are unfamiliar with the use of :id here, I would recommend reading the tutorial I linked above. We now have our routes, and I think that they are well structured and make sense.See more: update ionic 3 to ionic 4how to upgrade to ionic 4convert ionic 1 to ionic 4difference between ionic 3 and ionic 4ionic 4 migrationionic 3 vs ionic 4how to upgrade ionic 3 to ionic 4ionic 3 to 4 upgradelooking iphone app developerconvert vb app web based vb net appconvert access front end application web based appwindows app nokia ovi store convert pdfandroid app apk windows phone convertconvert app vb6 asp web based appconvert a template to dashboard page of appconvert angular 2 app to ionicconvert low resolution image to high resolution appchat app with ionic 3 and firebase — ep.
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