How To Validate Property With Code In Vue.js Build

What is Vue.js?

Vue.js is a progressive JavaScript framework used for building user interfaces. It is designed to be incrementally adoptable, meaning it can be used for small parts or integrated into existing projects. Vue.js is very popular among developers due to its flexibility, easy learning curve, and simplicity.

What is Property Validation in Vue.js?

One of the main features of Vue.js is its ability to validate the properties of components. Property validation is a built-in mechanism in Vue.js that allows you to define constraints for data properties in your components. This ensures that your code is secure, which can prevent errors and improve the stability of your application.

How To Validate Property With Code in Vue.js

Here are the steps to validate property with code in Vue.js:

Step 1: Define Validation Rules

The first step in validating a property in Vue.js is to define the validation rules. Vue.js provides a validation schema that can be used to define custom validation rules. The validation schema is defined using the validation library, which can be installed using NPM. Below is a sample code for defining validation rules:

import { Validator } from 'vee-validate';
	const schema = { 
	  name: 'required|string',
	  email: 'required|email',
	  age: 'required|numeric',
	};
	const validator = new Validator(schema);

Step 2: Add Validation to the Component

After defining the validation rules, the next step is to add validation to the component. In Vue.js, validation can be added to a component using the ‘validations’ property. The ‘validations’ property is an object that contains the validation rules for each property in the component. Below is a sample code for adding validation to a component:

import { Validator } from 'vee-validate';

	export default {
	  data() {
	    return {
	      name: '',
	      email: '',
	      age: '',
	    };
	  },
	  validations: {
	    name: {
	      required: true,
	      string: true
	    },
	    email: {
	      required: true,
	      email: true
	    },
	    age: {
	      required: true,
	      numeric: true
	    }
	  },
	  created() {
	    this.validator = new Validator(this.validations);
	  },
	  methods: {
	    submit() {
	      this.validator.validateAll().then(result => {
	        if(result) {
	          alert('Form Submitted Successfully');
	        }
	      });
	    }
	  }
	}

Step 3: Display Validation Errors

Finally, you need to display the validation errors to the user. In Vue.js, validation errors can be displayed using the ‘errors’ property. The ‘errors’ property is an object that contains the validation errors for each property in the component. Below is a sample code for displaying validation errors:

<template>
	  <div>
	    <input v-validate="'required|string'" v-model="name">
	    <span v-show="errors.has('name')" class="error">{{ errors.first('name') }}</span>
	    
	    <input v-validate="'required|email'" v-model="email">
	    <span v-show="errors.has('email')" class="error">{{ errors.first('email') }}</span>
	    
	    <input v-validate="'required|numeric'" v-model="age">
	    <span v-show="errors.has('age')" class="error">{{ errors.first('age') }}</span>
	    
	    <button @click="submit">Submit</button>
	  </div>
	</template>

Conclusion

Vue.js is a powerful JavaScript framework that makes it easy to build user interfaces. One of its standout features is property validation. By following the steps outlined in this article, you can validate properties in your Vue.js applications and make them more secure and stable.

FAQ

1. What is the purpose of property validation in Vue.js?

The purpose of property validation in Vue.js is to ensure that the data your application receives is correct and secure. This can prevent errors and improve the stability of your application.

2. Can validation rules be customized in Vue.js?

Yes, validation rules can be customized in Vue.js. Vue.js provides a validation schema that can be used to define custom validation rules.

3. What is the syntax for adding validation to a component in Vue.js?

In Vue.js, validation can be added to a component using the ‘validations’ property. The ‘validations’ property is an object that contains the validation rules for each property in the component.

4. How do you display validation errors in Vue.js?

In Vue.js, validation errors can be displayed using the ‘errors’ property. The ‘errors’ property is an object that contains the validation errors for each property in the component.

5. Is Vue.js suitable for building large-scale applications?

Yes, Vue.js is suitable for building large-scale applications. Vue.js is designed to be incrementally adoptable, meaning it can be used for small parts or integrated into existing projects.