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Today in Top Angular News – Monday, February 4

Today in Top Angular News – Monday, February 4

Today’s topics include angular, javascript, abetterwaytolearn, angular7, angularjs, dataviz, rxjs, httpClient, Fullstack, DevLife, angularcli, webpack, and React. Special thanks to contributors The serverless webpack authors, @adamaso, Angela Damaso, Anil Singh, @jinalshah999, jinal shah, plambweb, JavaScript_Plow, +Aleksey Novik, Aleksey Novik, Chris Sevilleja (@chrisoncode), coding_latte, webcodegeeks, and FullstackDevJS.


Creating a File Upload Component in Angular (Including Backend)

First, we will create a simple express server with just one route to accept file uploads. Afterward, we will create an angular application from scratch and build a beautiful file-upload component using the angular material ui-component-library. We are going to use the

Create a new application by opening a command prompt at the desired location and type:

Because we will need some complex ui-elements such as modal-windows, I decided to use the

To install this library, use this command:

To make the css of this module available in our app, we need to import it into our app's global style.css file:

Also, we are using a flexbox-design for this. To make flexbox a little bit easier to use with angular there is a library called the library like this:

To make our desired file-upload component as re-usable as possible, I decided to bundle it into a separate feature module. So let's create this DialogComponent:

The first thing we need to do is to add a file input element to our component. Continue reading


Creating a File Explorer Component in Angular

We will explore how to use the angular material library to create a visual appealing component to manage our files. We do so by using npm with this command:

To import the styles that come along with the library, we need to import them into our style.css file:

We are also going to need the material design icons, so we add a link in our index.html file:

To align items nicely, we are also using flexbox:

Furthermore, we are going to need a small module to generate (pseudo)random ids. Because there are so many ways to handle files in the backend, I decided to make the component itself as dumb as possible. We can use the angular-cli to create the components for us:

The templates of these dialogues look like this:

Except the title, the template of the rename dialog is just the same:

We also need to edit the . This method causes the service to query all the FileElements for the current folder and update the array. Continue reading


Angular 6: Dynamic Themes Without a Library – Atom Platform – Medium

Why Material Alone Won’t Work
Ever since Angular Material was released, developers have been flocking to this library to utilize their reusable components (not to mention built-in accessibility)
Material comes with built-in theming, but this may not work for two reasons:
By default, Material comes with it’s own color palette that is optimized for accessibility. With this combination, you can use a form to pass CSS variables to a Sass map, which can be used throughout the app. This implementation:
Does not use any external libraries
Allows multiple components to dynamically change styles through a form
Saves the form as an object that can be saved in a database or local store
Has the capability to load an external object as a preloaded or preset style

Link to Demo: to Stackblitz: Magic
The core principle behind this method is combining Sass maps and CSS Variables. In our theme.scss file, the default values are set and passed into a Sass map
theme.scss
// default colors.theme-wrapper {
–cardColor: #CCC;
–cardBackground: #FFF;
–buttonColor: #FFF;
–buttonBackground: #FFF;
–navColor: #FFF;
–navBackground: #FFF;
–footerColor: #FFF;
–footerBackground: #FFF;
–footerAlignment: left;
}// pass variables into a sass map$variables: (
–cardColor: var(–cardColor),
–cardBackground: var(–cardBackground),
–buttonColor: var(–buttonColor),
–buttonBackground: var(–buttonBackground),
–navColor: var(–navColor),
–navBackground: var(–navBackground),
–footerColor: var(–footerColor),
–footerBackground: var(–footerBackground),
–footerAlignment: var(–footerAlignment)
);A function is created to return the native css variable from the global sass map
function.scss
@function var($variable) {
@return map-get($variables, $variable);
}The components can now read these two files to host a dynamic variable that changes upon form '. The object then gets passed to the TypeScript file which dynamically overwrites the searching the entire page for css variables
private themeWrapper = {
{ if (stylesheet.globalNavColor) {
stylesheet.globalNavColor);
}… if (stylesheet.globalButtonColor) {
}}The globalOverride function checks to see if a value exists for that specific variable, then replaces each CSS Variable with the new inputted one. Continue reading


Interceptors — An Important feature of Http Client – jinal shah – Medium

Interceptors will check each and every incoming and outgoing request to the server and it is also able to manipulate them before actually sending them to server. say for example imagine the use case where we need to send user authentication token each and every time with the http request we are sending to server, so instead of writing/fetching token in every request we can simply create the Interceptors, which will inspect our http request, manipulate it (add auth token) and then actually pass it to server. another use case, say for example we need to pass headers with each and every http request, so instead of passing it to every request we can create interceptors, so it can inspect our request, manipulate it with headers and pass it to the server. Below is the code snippet for cloned request in which I am changing url by interceptors. Below is the code snippet of app.component.ts and task.service.ts files as you can see from above code snippet we are making call to http:// , but this call will through our interceptors which will eventually replace http:// with https://
URL is changed through the Interceptor.In the same way we can use Interceptors to add headers, edit the interceptors is shown below,
which will send the http request with headers as shown in below image,
Header added through the Interceptor.I hope this will be helpful to you in understanding the Interceptors. Continue reading


Intro to Testing in Angular

Joe introduces us to 3 types of tests you can write for your Angular application: isolated tests, shallow integration tests and deep integration tests. This type of test, at least in part, will test out functionality at the component level. This test will test functionality in the component as well as making sure that its child components display information properly as well. Here's an example of that:

This is very similar to the shallow tests, with the exception that we reach down into children components and test those as well. These three types of tests will cover all aspects of your Angular application. Continue reading

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