How to Retrieve DatePicker Values from Child Components in Angular

Описание: Learn how to effectively get `DatePicker` values from child components in Angular and utilize them in parent component methods for seamless data retrieval.
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This video is based on the question https://stackoverflow.com/q/63991850/ asked by the user 'AidanMcC' ( https://stackoverflow.com/u/14314545/ ) and on the answer https://stackoverflow.com/a/63993450/ provided by the user 'Kunal Karmakar' ( https://stackoverflow.com/u/2007130/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Retrieve DatePicker Values from Child Components in Angular

As an Angular developer, you might find yourself in situations where you need to get values from child components, especially when it comes to interactive UI elements like DatePicker. If you're working with a form that consists of multiple DatePickers, retrieving their values efficiently is crucial for end-user functionality. In this guide, we'll explore a common problem: getting values from two separate date pickers in a child component to use them as a date range for database searches.

The Problem

You have a simple Angular application that uses routing and forms to connect to a local database via an API. The goal is to use two separate DatePickers to define a date range for database queries. Here’s the setup you have:

A child component (DateRangeComponent) encapsulates a DatePicker.

This child component is used twice in the parent component.

The parent component is trying to gather both date values to use them in a search method.

However, you are encountering issues as you cannot retrieve the DatePicker values in a usable format within the parent component's search method.

Solution Overview

To successfully retrieve the date values from the child components, a couple of steps need to be integrated into your Angular code:

1. Implementing OnChanges in the Child Component

The first step involves modifying the child component. By implementing OnChanges you can effectively respond to changes in input properties and manage the data flow between the parent and child components.

Modify DateRangeComponent:

[[See Video to Reveal this Text or Code Snippet]]

2. Handling emitted values in the Parent Component

Once the child component emits the date value, the parent component needs to capture and utilize it properly. This ensures you have the correct date values to pass along in your search method.

Update ProductListComponent:

[[See Video to Reveal this Text or Code Snippet]]

3. Sidebar: Connecting the UI

Ensure that both DatePicker components in your parent template are set up correctly:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By correctly implementing the OnChanges lifecycle hook in your child DateRangeComponent, and properly managing the emitted date values in your parent ProductListComponent, you can effectively retrieve and utilize DatePicker values for your database queries. This pattern not only keeps your components decoupled and reusable but also enhances the overall functionality of your Angular application.

With these adjustments, you should be able to get those date values just right and make your search functionality a breeze!