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Validation rules in Vue Form Validator component

Default Rules

The FormValidator has following default validation rules, which are used to validate the form.

Rules Description Example
required The form input element must have any input values a or 1 or -
email The form input element must have valid email format values form@syncfusion.com
url The form input element must have valid url format values http://syncfusion.com/
date The form input element must have valid date format values 05/15/2017
dateIso The form input element must have valid dateISO format values 2017-05-15
number The form input element must have valid number format values 1.0 or 1
digit The form input element must have valid digit values 1
maxLength Input value must have less than or equal to maxLength character length if maxLength: 5, check is valid and checking is invalid
minLength Input value must have greater than or equal to minLength character length if minLength: 5, testing is valid and test is invalid
rangeLength Input value must have value between rangeLength character length if rangeLength: [4,5], test is valid and key is invalid
range Input value must have value between range number if range: [4,5], 4 is valid and 6 is invalid
max Input value must have less than or equal to max number if max: 3, 3 is valid and 4 is invalid
min Input value must have greater than or equal to min number if min: 4, 5 is valid and 2 is invalid
regex Input value must have valid regex format if regex: '^[A-z]+$', a is valid and 1 is invalid

The rules option should map the input element’s name attribute. The FormValidator library only validates the mapped input elements.

Defining Custom Rules

You can also define custom rules in the rules property and validate the form with custom logics.

The custom validation method need to return the boolean value for validating an input.

Source
Preview
app.vue
<template>
    <div>
        <div class="col-lg-12 control-section form-support">
            <div class="control_wrapper" id="control_wrapper">
                <!-- Initialize Uploader -->
                <form id="form1" action="saveFiles.ashx" method="post">
                    <h4 class="form-title">Form Validator</h4>
                    <div class="form-group" style="padding-top: 11px;">
                        <div class="e-float-input">
                            <input type="text" id="name" name="Name" data-required-message="* Enter your name" required="" data-msg-containerid="nameError">
                                <span class="e-float-line"></span>
                                <label class="e-float-text e-label-top" for="name">Name</label>
                        </div>
                        <div id="nameError"></div>
                    </div>
                    <div class="form-group" style="padding-top: 11px;">
                        <div class="e-float-input">
                            <input type="email" id="email" name="Email" data-validation="email" data-required-message="* Enter your email" required="" data-msg-containerid="mailError">
                                <span class="e-float-line"></span>
                                <label class="e-float-text e-label-top" for="email">Email</label>
                        </div>
                        <div id="mailError"></div>
                    </div>
                    <div class="form-group" style="padding-top: 11px;">
                        <div class="e-float-input">
                            <input type="number" id="mobileno" name="MobileNo" data-required-message="* Enter your mobile number" required="" data-msg-containerid="noError">
                                <span class="e-float-line"></span>
                                <label class="e-float-text e-label-top" for="mobileno">Mobile No</label>
                        </div>
                        <div id="noError"></div>
                    </div>
                    <div class="form-group" style="padding-top: 11px;">
                        <div class="e-float-input upload-area">
                            <input type="text" id="upload" name="upload" readonly="" data-required-message="* Choose any file" required="" data-msg-containerid="uploadError">
                            <ejs-uploader id='fileupload' name="UploadFiles" :autoUpload= "isAuto" :selected= "onFileSelect"
                            allowedExtensions= "image/*" :dropArea = "dropElement" :multiple= 'false' ></ejs-uploader>
                            <button id="browse" class="e-control e-btn e-info">Browse...</button>
                            <span class="e-float-line"></span>
                            <label class="e-float-text e-label-top" for="upload">Choose a file</label>
                        </div>
                        <div id="uploadError"></div>
                    </div>
                    <div class="form-group" style="padding-top: 11px;">
                        <div class="e-float-input">
                            <textarea class="address-field" rows="4" id="Address" name="Address"></textarea>
                            <span class="e-float-line"></span>
                            <label class="e-float-text e-label-top" for="address">Address</label>
                        </div>
                    </div>
                </form>
                <div class="submitBtn">
                    <button class="submit-btn e-btn" id="submit-btn">Submit</button>
                </div>
                <ejs-dialog id='uploadAlert' :header='header' showCloseIcon=true :width= 'width' :content= 'dlgContent' :target= 'dlgTarget'
                :isModal= 'Modal' :visible="false" :animationSettings= 'animation' ref="dialogObj" >
                </ejs-dialog>
            </div>
        </div>
    </div>
</template>

<script>
import Vue from 'vue';
import { UploaderPlugin } from '@syncfusion/ej2-vue-inputs';
import { FormValidator  } from '@syncfusion/ej2-vue-inputs';
import { DialogPlugin } from '@syncfusion/ej2-vue-popups';
Vue.use(UploaderPlugin);
Vue.use(DialogPlugin);

export default {
    data: function() {
        return {
          path:  {
            saveUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Save',
            removeUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Remove'
          },
          dropElement: '.control-fluid',
          extensions: '.jpg, .png',
          isAuto: false,
          formObj: '',
          header: 'Success',
          animation: {effect: 'zoom'},
          Modal: true,
          dlgTarget: '.control_wrapper',
          dlgContent: 'Your details have been updated successfully, Thank you.',
          width: '335px',
          options : {
        //Initialize the CustomPlacement.
            customPlacement: function(inputElement, errorElement) {
                inputElement = inputElement.closest('.form-group').querySelector('.error');
                inputElement.parentElement.appendChild(errorElement);
            },
                rules: {
                    'Name': {
                        required: true
                    },
                    'Email': {
                        required: true
                    },
                    'upload': {
                        required: true
                    }
                }
            }
        }
    },
    mounted: function () {
        document.getElementById('browse').onclick = () => {
            document.getElementsByClassName('e-file-select-wrap')[0].querySelector('button').click();
            return false;
        };
        let localObj = this;
        document.getElementById('submit-btn').onclick = function() {
            localObj.onFormSubmit();
        };
        this.formObj = new FormValidator('#form1', this.options);
    },
    methods:{
        onFormSubmit: function() {
            let formStatus = this.formObj.validate();
            if (formStatus) {
                this.formObj.element.reset();
                this.$refs.dialogObj.show();
            }
        },
        onFileSelect: function(args) {
            let inputElement = document.getElementById('upload');
            inputElement.value = args.filesData[0].name;
        },
    }
}
</script>
<style>
@import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";
    #container {
        visibility: hidden;
        padding-left: 5%;
        width: 100%;
    }
    #loader {
        color: #008cff;
        font-family: 'Helvetica Neue','calibiri';
        font-size: 14px;
        height: 40px;
        left: 45%;
        position: absolute;
        top: 45%;
        width: 30%;
    }
    .form-support .control_wrapper {
            max-width: 400px;
            margin: auto;
        }
        .form-support .address-field {
            max-height: 50px;
            resize: none;
        }
        .form-support #control_wrapper {
                max-width: 500px;
                margin: auto;
                border: 0.5px solid #BEBEBE;
                box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.36);
                padding: 1% 4% 2%;
                background: #f9f9f9;
        }

        .form-support .e-error {
            padding-top:3px;
        }
        .form-support .e-upload {
            width: 100%;
            position: relative;
            margin-top: 15px;
        }
        .form-support .control_wrapper .e-upload .e-upload-drag-hover {
            margin: 0;
        }

        .form-support .submit-btn {
            margin-top: 15px;
        }
        .form-support .submitBtn .desc {
            margin: 2% 20% 0% 18%;
        }
        @media only screen and (max-width: 500px) {
            .form-support .submitBtn .desc {
                margin: 12px;
            }
            .form-support .upload-area, .e-bigger .upload-area {
                width: 60%;
            }
        }
        .form-support .submitBtn {
            position: relative;
            text-align: center;
        }
        .form-support .success .successmsg {
            border: 0.5px solid green;
            padding: 10%;
            color: green;
        }
        .form-support form#form1 {
            position: relative;
            top: 14%;
        }
        .form-support .e-upload {
            display: none;
        }
        .form-support input.choose-file{
            width: 60%;
        }
        .form-support button#browse {
            float: right;
            margin-right: -115px;
            margin-top: -29px;
            position: relative;
        }
        .fabric .form-support #browse, .highcontrast .form-support #browse {
            top: -3px;
        }
        .bootstrap .form-support #browse {
            top: -6px;
        }
        .form-support .form-title {
            text-align: center;
        }
        #form1 .e-float-input:not(.e-input-group), #form1 .e-float-input.e-control-wrapper:not(.e-input-group) {
            display: inherit;
        }

         input#mobileno::-webkit-inner-spin-button, input#mobileno::-webkit-outer-spin-button {
            -webkit-appearance: none;
            margin: 0;
        }

        .e-float-input.upload-area {
            width: 70%;
        }
    </style>

Adding or Removing Rules

After creating FormValidator object, you can add more rules to an input element by using addRules method and you can also remove an existing rule from the input element by using removeRules method.

import {FormValidator, FormValidatorModel} from '@syncfusion/ej2-vue-inputs';

export default {
    data: function() {
        return {
          options : {
        //Initialize the CustomPlacement.
            customPlacement: function(inputElement, errorElement) {
                inputElement = inputElement.closest('.form-group').querySelector('.error');
                inputElement.parentElement.appendChild(errorElement);
            },
                rules: {
                    'Name': {
                        required: true
                    },
                    'Email': {
                        required: true
                    },
                    'upload': {
                        required: true
                    }
                }
            }
        }
    }
let formObject: FormValidator = new FormValidator('#form-element', options);
// Add email rule to user element
formObject.addRules('user', { maxLength: 7 });
// Remove number rule from age element
formObject.removeRules('age', ['number']);

Validating a Single Element

The validate method have an optional argument, where you can pass an input element’s name attribute to validate its value against the defined rule.

import {FormValidator, FormValidatorModel} from '@syncfusion/ej2-vue-inputs';

export default {
    data: function() {
        return {
          options : {
        //Initialize the CustomPlacement.
            customPlacement: function(inputElement, errorElement) {
                inputElement = inputElement.closest('.form-group').querySelector('.error');
                inputElement.parentElement.appendChild(errorElement);
            },
                rules: {
                    'Name': {
                        required: true
                    },
                    'Email': {
                        required: true
                    },
                    'upload': {
                        required: true
                    }
                }
            }
        }
    }
let formObject: FormValidator = new FormValidator('#form-element', options);
// Add email rule to user element
formObject.validate('user');