Mastering Form Validation in Vue: A Step-by-Step Guide
When building forms, developers need to ensure that users enter accurate and valid information. This is where form validation comes in – a crucial step in guaranteeing the quality of user input. In this article, we’ll explore how to implement form input validation in Vue using the powerful watch option.
Getting Started
To follow along, you’ll need Node.js ≥v10.x installed, as well as a code editor like VS Code, Vue installed globally on your machine, and Vue CLI 3.0 installed. Download a Vue starter project or clone it using Git, then navigate into the unzipped file or cloned project and run the command to keep all dependencies up to date.
Understanding Watchers in Vue
Vue’s watch option is a game-changer for responding to data changes in a given element. It’s also an excellent tool for conducting form validation. With watch, you can trigger JavaScript functions to validate user input in real-time.
Building Our Form
Let’s create a form for creating a new account, complete with fields for email and password. Open the project in your IDE, go into the component folder, and replace the content of your Test.vue file with the code block below:
Email Validation
We’ll use the watch option to trigger a function that checks for a valid email address. Replace your template section with the code block below:
Password Validation
Next, we’ll validate that the password is at least eight characters long. If it contains fewer than eight characters, we’ll prompt the user to make it longer. Replace the script section of the test.vue component with the code block below:
Adding a Submit Button
Now, let’s add a submit button! Our button will be disabled if the email and password are not validated. We’ll update our validation functions to update the disabled array if validations are or aren’t met.
Putting it All Together
With our form validation in place, we can now track user input and ensure that only valid information is submitted. By using the watch option, we’ve created a robust and user-friendly form that provides real-time feedback to users.
Take Your Vue Apps to the Next Level
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