Author: Vijay SRJ
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How to communicate between two components in Angular through template reference?
Angular allows component interaction in five ways: Through @Input annotation , a parent component can pass its values to a child component Through @Output annotation , a child component can pass its values and event to a parent component Through services, a child component can subscribe to events of the parent. Through template reference ,…
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How to communicate between angular components through a shared service?
In the previous post I showed how to interact between angular components using @Input and @Output annotations. A parent component can pass data to child component using @Input annotation. A child component can emit an event (with data if required) to parent using @Output annotation The link is here : How do components communicate in…
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How do components communicate in Angular and how to use @Input and @Output annotations?
There are five ways through which angular components can communicate with each other : Through @Input annotation Through @Output annotation Using local template reference. Using services Using @ViewChild annotation Lets look at @Input and @Output annotation use cases in this post. @Input annotation Say in one component you have a list of items. You create…
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What are the new features in Java 14 that a day to day Java developer should know?
There are about 16 changes introduced in Java 14. Not all of them need to be known for a day to day java programmer to improve his programming. Here are the 5 features which every Java developer should know which will save his time and improve code quality: Text Blocks If you want to define…
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The evolution of Switch Statement up-to Java 14
Switch expressions in java are used to evaluate results or compute logic based on different values of a particular variable.This post looks at the evolution of switch statements up-to Java 14. Until Java 7 only integers could be used in switch case and this had been the standard for a long time: And then strings…
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How to authenticate a user when both offline and online in Angular?
I am developing an offline first angular app using Pouch DB and Couch DB . The end user is a desktop user who wants to use the app even when not connected to the internet. I am using Pouch DB for local database and Couch DB for remote database. One of the difficulties in developing…
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How to build Immediately Invoked Function Expressions in Javascript?
While I was exploring how to retrieve results from an asynchronous function in Angular , I stumbled upon a solution where the developer had used IIFE to retrieve the result : It looked like this : This was confusing at first. But after exploring IIFE the above code made sense. First lets deep dive into…
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How to check user inactivity in Angular?
Lets say you want to alert the user if they remain inactive for a long time. Or you want to log the user out if they are inactive for a long time. How can you do that in angular? The below algorithm can be followed to achieve that: STEP 1: Define user inactivity : User…
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How to update a pouch db document through Angular?
I start this post assuming you know how to integrate pouch db with angular . If not please refer this post : (How to integrate pouch db with angular?) Once pouch db is integrated you might want to update documents into pouch db through Angular . Here is how to do it: Step 1: Retrieve…
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How to search documents in Pouch DB through Angular, based on specific field?
Through Mango queries. Pouch DB supports the feature of querying documents based on field values through a separate plugin and calls this feature as ‘Mango queries’. So the first step to avail this feature is to install it : Assumption : you have already installed pouch db and able to save documents( Refer : https://fullstackdeveloper.guru/2020/03/21/how-to-integrate-pouch-db-with-angular/)…
