svelte-validoz

svelte-validoz is Validoz for Svelte for form validation.

See svelte-yup better library for data validation

Installation

$ npm install svelte-validoz

Sample code

<script>
import {validoz, isValid, Message} from 'svelte-validoz';
import {fields} from './form.js';
let result;
let submited = false;
$: if(submited){
    result = validoz(fields);
}
let formSubmit = () =>{
    submited = true;
    result = validoz(fields);
    // if everything validated
    if(isValid(result)){
        alert('Everything is validated!');
    }
}
</script> 

<form on:submit|preventDefault="{formSubmit}">
    <h4>Form</h4>
    <input type="text" placeholder="Enter email" bind:value="{fields[0].value}"><br>
    <Message result={result} name="Email address"/>
    <input type="number" placeholder="Age" bind:value="{fields[1].value}"><br>
    <Message result={result} name="Age"/>
    <button type="submit">Submit</button>
</form>

// form.js file
export let fields = [
    {
        name: "Email address",
        type: "email",
        value: '',
        // you can pass your custom properties
    },
    {
        name: "Age",
        type: "number",
        value: 12,
        min: 18
    },
];

Remove those lines below if you want to revalidate only after submits.

let submited = false;
$: if(submited){
    result = validoz(fields);
}

All messages in one place

Example below to put all messages in one place by AllMessages component

<script>
import {validoz, isValid, AllMessages} from 'svelte-validoz';
import {fields} from './form.js';
let result;
let submited = false;
$: if(submited){
    result = validoz(fields);
}
let formSubmit = () =>{
    submited = true;
    result = validoz(fields);
    // if everything validated
    if(isValid(result)){
        alert('Everything is validated!');
    }
}
</script> 

<form on:submit|preventDefault="{formSubmit}">
    <h4>Form</h4>
    <input type="text" placeholder="Enter email" bind:value="{fields[0].value}"><br>
    <input type="number" placeholder="Age" bind:value="{fields[1].value}"><br>
    <AllMessages result={result}/> // add it once
    <button type="submit">Submit</button>
</form>

Date example

import {validoz, isValid, isValidByName} from 'validoz';
let field = [
{
    name: "Date",
    type: "date",
    value: '24/05/2020',
    dateFormat: 'dd/mm/yyyy',
    startDate: '08/02/2020',
    endDate: '24/05/2020',
}
];
 
let result = validoz(field);
console.log(result); // { field: 'Date', message: '' }
isValid(result); // true
isValidByName(result, 'Date'); // true

Types

name	Description
text	Any characters
password	String must contain at least one numberic, one upper case, one lower case characters and the length at least 6 characters
fullname	String should contain at least 2 words with 3 characters for each of the words and separated by space. It can contain more than one word.
username	Like Instagram username.
word	Alphabet characters.
number	An integer number
date	Example 21/03/2020 string.
time	Example 05:12 string.

Field properties

name	Description
name	Field name
value	Field value
type	Field type
required	Boolean. default: true
min and max	Minumum and Maximum of type number. Each of them can be passed alone.
minDigits and maxDigits	Minumum and Maximum digits of type number. Each of them can be passed alone.
minLength and maxLength	Minimum and Maximum length of the string types.
dateFormat	String values of mm/dd/yyyy, mm-dd-yyyy, dd/mm/yyyy, dd-mm-yyyy, yyyy/mm/dd and yyyy-mm-dd
equal	A field value and equal value to be equal.
notEqual	A field value and equal value not to be equal.

Other example

let {validoz, isValid, isValidByName} = require('validoz');
 
let {field} = require('./form.js');
let result = validoz(field);
console.log(result); 
/*
Returns: 
[
  { field: 'Full name', message: '' },
  { field: 'Email address', message: 'Email address is invalid' },
  { field: 'Age', message: 'Age must be between 18 and 60' },
  { field: 'Best friend', message: 'Best friend value is wrong' },
  {
    field: 'Password',
    message: 'Password must contain at least one numberic, one upper case, one lower case characters and the length at least 6 characters'
  }
]
*/
isValid(result); // false
isValid(result); // false
isValid(result[0]); // "Full name", true
isValidByName(result, 'Full name'); // true
isValidByName(result, 'Email address'); // false
isValidByName(result, 'Password'); // false

// form.js file
export let field = [
    {
        name: "Full name",
        type: "text",
        value: 'Hello world',
        minLength: 6
    },
    {
        name: "Email address",
        type: "email",
        value: 'example@.com'
    },
    {
        name: "Age",
        type: "number",
        value: 12,
        min: 18,
        max: 60,
    },
    {
        name: "Best friend",
        type: "text",
        value: 'Doe',
        equal: 'John' // value must be John
    },
    {
        name: "Password",
        type: "password", // you can also pass text if you don't want regex pattern to be conditioned
        value: '123456',
        minLength: 6,
        maxLength: 30,
    }
];

Other Examples with source code

• Example1
• Example2
• Integerating with Svelte Material UI (SMUI)

Author

Kamyar Lajani

License

MIT