Welcome!

@ThingsExpo Authors: Zakia Bouachraoui, Yeshim Deniz, Liz McMillan, Elizabeth White, Pat Romanski

Related Topics: @DevOpsSummit, Java IoT, @ThingsExpo

@DevOpsSummit: Article

Angular and TypeScript | @ThingsExpo @YFain #IoT #Angular #TypeScript

I was writing a small app in Angular 2 in TypeScript with the on-the-fly transpiling by SystemJS.

Angular, TypeScript, SystemJS, and Browser Cache

I was writing a small app in Angular 2 in TypeScript with the on-the-fly transpiling by SystemJS.

I needed to implement a router that would switch between the Home and ProductDetail views in a single page app.

The root component had two links and was supposed to render either Home or ProductDetail components depending on which link the user clicks. Angular 2 offers a pretty elegant syntax for this:

Configure the router to map the component to a URL, and use property binding in the form of [router-link]. Nice and easy, isn't it?
Then I created a HomeComponent to render the text ‘Home Component' , copy-pasted the code into ProductDetailComponent and started the app in the browser. My app uses the on-the-fly TypeScript to JavaScript compilation offered by the module loader SystemJS.

Running the app properly rendered the text Home Component, but when I clicked on the second link, nothing happened - the text Home Component remained in the browser window. Opened the code of the ProductDetailComponent. Oops... Forgot to change the text for rendering while copy-pasting - it still had ‘Home Component'. No biggies. Replaced it with ‘Product Detail Component' and re-ran the app. Nothing changed. I still see Home Component no matter what link I click.

So what do we do with this nice syntax with Angular binding and TypeScript annotations? There is nothing to debug there. We need to debug the actual ES5 code that runs in the browser. Here's the snapshot of my Chrome browser's screen after I clicked on the Product Detail link with opened Dev Tools panel:

ts1

Note that Angular router properly formed the URL for the product view. The template property in the file product.ts has the right content: ‘Product Detail Component'. Now let's take a look at the content of the file product.ts!transpiiled, which was auto-generated by SystemJS:

ts2

This file was not regenerated and still has the ‘Home Component' in the template property! Apparently, changing the string content is not a good enough reason for SystemJS to re-run the TypeScript transpiler and the browser used its cached version. Running the same example in FireFox worked as expected - its cache was clean so fresh ES5 files were generated by SystemJS.

Chrome Dev Tools has an option Disable Cache while Dev Tools open, and this would clear the cache on the page refresh. But if you want the browser cache to be refreshed even if the Dev Tools are not open, add the following lines between the head tags in your HTML file:

Manning opened the MEAP program for our upcoming book "Angular 2 Development with TypeScript", where JSPM, SystemJS and TypeScript development is covered in greater details. 

More Stories By Yakov Fain

Yakov Fain is a Java Champion and a co-founder of the IT consultancy Farata Systems and the product company SuranceBay. He wrote a thousand blogs (http://yakovfain.com) and several books about software development. Yakov authored and co-authored such books as "Angular 2 Development with TypeScript", "Java 24-Hour Trainer", and "Enterprise Web Development". His Twitter tag is @yfain

IoT & Smart Cities Stories
The deluge of IoT sensor data collected from connected devices and the powerful AI required to make that data actionable are giving rise to a hybrid ecosystem in which cloud, on-prem and edge processes become interweaved. Attendees will learn how emerging composable infrastructure solutions deliver the adaptive architecture needed to manage this new data reality. Machine learning algorithms can better anticipate data storms and automate resources to support surges, including fully scalable GPU-c...
Machine learning has taken residence at our cities' cores and now we can finally have "smart cities." Cities are a collection of buildings made to provide the structure and safety necessary for people to function, create and survive. Buildings are a pool of ever-changing performance data from large automated systems such as heating and cooling to the people that live and work within them. Through machine learning, buildings can optimize performance, reduce costs, and improve occupant comfort by ...
The explosion of new web/cloud/IoT-based applications and the data they generate are transforming our world right before our eyes. In this rush to adopt these new technologies, organizations are often ignoring fundamental questions concerning who owns the data and failing to ask for permission to conduct invasive surveillance of their customers. Organizations that are not transparent about how their systems gather data telemetry without offering shared data ownership risk product rejection, regu...
René Bostic is the Technical VP of the IBM Cloud Unit in North America. Enjoying her career with IBM during the modern millennial technological era, she is an expert in cloud computing, DevOps and emerging cloud technologies such as Blockchain. Her strengths and core competencies include a proven record of accomplishments in consensus building at all levels to assess, plan, and implement enterprise and cloud computing solutions. René is a member of the Society of Women Engineers (SWE) and a m...
Poor data quality and analytics drive down business value. In fact, Gartner estimated that the average financial impact of poor data quality on organizations is $9.7 million per year. But bad data is much more than a cost center. By eroding trust in information, analytics and the business decisions based on these, it is a serious impediment to digital transformation.
Digital Transformation: Preparing Cloud & IoT Security for the Age of Artificial Intelligence. As automation and artificial intelligence (AI) power solution development and delivery, many businesses need to build backend cloud capabilities. Well-poised organizations, marketing smart devices with AI and BlockChain capabilities prepare to refine compliance and regulatory capabilities in 2018. Volumes of health, financial, technical and privacy data, along with tightening compliance requirements by...
Predicting the future has never been more challenging - not because of the lack of data but because of the flood of ungoverned and risk laden information. Microsoft states that 2.5 exabytes of data are created every day. Expectations and reliance on data are being pushed to the limits, as demands around hybrid options continue to grow.
Digital Transformation and Disruption, Amazon Style - What You Can Learn. Chris Kocher is a co-founder of Grey Heron, a management and strategic marketing consulting firm. He has 25+ years in both strategic and hands-on operating experience helping executives and investors build revenues and shareholder value. He has consulted with over 130 companies on innovating with new business models, product strategies and monetization. Chris has held management positions at HP and Symantec in addition to ...
Enterprises have taken advantage of IoT to achieve important revenue and cost advantages. What is less apparent is how incumbent enterprises operating at scale have, following success with IoT, built analytic, operations management and software development capabilities - ranging from autonomous vehicles to manageable robotics installations. They have embraced these capabilities as if they were Silicon Valley startups.
As IoT continues to increase momentum, so does the associated risk. Secure Device Lifecycle Management (DLM) is ranked as one of the most important technology areas of IoT. Driving this trend is the realization that secure support for IoT devices provides companies the ability to deliver high-quality, reliable, secure offerings faster, create new revenue streams, and reduce support costs, all while building a competitive advantage in their markets. In this session, we will use customer use cases...