Скачать или смотреть How to Send Form Values to Node/Express for Database Search

Learn how to effectively send form data from your Angular application to a Node.js/Express backend to search a database.
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How to Send Form Values to Node/Express for Database Search

In modern web applications, the ability to collect user input and utilize it to search a database is crucial, particularly when working with frameworks like Angular and Node.js. Whether you’re building a search feature or filtering data, setting up the proper connection between your frontend and backend can initially seem daunting. Today, we’ll walk you through how to send form values to your Node/Express application so you can search your database efficiently.

The Problem: Sending Form Data to Your Node/Express Backend

Suppose you have a pre-populated form with GPS coordinates that needs to send data to your Express backend. The ultimate goal is to use this data in your database queries. Here’s a brief breakdown of your setup:

Frontend: An Angular form with a text input for GPS coordinates.

Backend: An Express endpoint that will handle the incoming request and look up data in your database.

Your Current Form Structure

You currently have the following HTML structure for your form:

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

Your Current Backend Code

On the server side, you have an endpoint defined as follows:

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

The Missing Link

Now, the critical question arises: How can you send the data from this form to be used in your find query? Let’s explore how to achieve that.

The Solution: Sending Form Values Using HttpClient in Angular

To bridge the gap between your Angular frontend and the Express backend, you need to utilize Angular’s HttpClient service to make HTTP requests. Here’s a step-by-step guide on how to set this up.

Step 1: Import HttpClient Module

Make sure to import the HttpClientModule in your Angular module to be able to use HttpClient:

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

Step 2: Create a Service for HTTP Requests

Create a service where you'll handle your API requests:

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

Step 3: Setup the Form Submission

In your component, bind the form submission to call makeRequest():

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

Step 4: Modify the Button HTML

Remove the onclick event from your button to prevent reloading the page:

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

Summary

By following these steps, you can successfully send form values from your Angular application to your Node.js/Express backend. This will enable your Express API to receive the GPS coordinates and utilize them in your database queries.

Conclusion

Incorporating form values into your Node.js/Express application for database searches can enhance the interactivity and responsiveness of your application. Using Angular’s HttpClient service allows you to seamlessly send data and retrieve information without page refreshes, providing a smoother user experience.

Feel free to implement these steps in your project, and watch how simple data fetching transforms your application’s functionality!