In this section, thought to talk about HTTP-Client usage in angular and how its different from existing HTTP Module. It has RxJS Observable-based API. It means that the multiple calls to the HTTP module will return an observable, which we need to subscribe.

Salient Features:-

• If we don’t subscribe to these observables, it won’t work.
• If we subscribe multiple times to these observables, multiple HTTP requests will be triggered.
• If HTTP request is successful, it will emit only one value and then complete
• If HTTP request fails, then these observables will emit an error.

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In this section, we are going to talk about pipes. Pipes are the features to transform the output in your template. My simple app around the same looks like this.

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In reactive forms also, we can do grouping as shown below in example.

Continue reading “Reactive Forms in Angular – Part 2” »

Hi,

In the last section, we have seen how to register controls, how we can submit the form and also which properties this form has. In this section, we will extend the Forms learning from the last point. Basically, we will see start with local reference way of accessing the form. Therefore, when I mention, local reference, it means I am referring to @ViewChild() property.

Continue reading “Angular Forms – Template Driven Part 2” »

Hi Friends,

In this section, we are going to talk about dynamically importing modules and its related components. Say for instance, your CORE SPA is hosted on one server. And different teams are basically building different features as modules, which needs to be injected as part dependency injection. Idea is keeping Core part leaner and meaner. Then how could we achieve the same. In the last post, we have seen similar kind of post, where in we injected modules dynamically but, module was known at compile time as we have used webpack’s import which basically takes path to module as input parameter. In this case, module’s can be injected by reading some kind of metadata coming from somewhere. Hence, you can have get some JSON files with some metadata say what modules’ and related dependencies to load. Then, it will load accordingly

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In this section, we are going to see, how to dynamically import modules and other related components. In enterprise apps, there might be a scenario, where in you end up loading the modules based on some metadata, say which is coming from some REST call may be. In those scenarios, this kind of implementation is needed. We will discuss Lazy Loading in detail when we talk about those scenarios. However, let’s look at the code where we lazy load modules with all its dependencies.

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In this section, we will cover pending things of routing. Basically, in this section, we will cover Routing module and Route Guard.

Hence, without wasting time, let’s get started.

Continue reading “Routing in Angular 4 – Part 6” »