Error messages in React Form validator component

30 Jan 202313 minutes to read

The FormValidator provides default error messages for all default validation rules.
It is tabulated as follows

Rules	message
required	This field is required.
email	Please enter a valid email address.
url	Please enter a valid URL.
date	Please enter a valid date.
dateIso	Please enter a valid date ( ISO ).
number	Please enter a valid number.
digit	Please enter only digits.
maxLength	Please enter no more than {0} characters.
minLength	Please enter at least {0} characters.
rangeLength	Please enter a value between {0} and {1} characters long.
range	Please enter a value between {0} and {1}.
max	Please enter a value less than or equal to {0}.
min	Please enter a value greater than or equal to {0}.
regex	Please enter a correct value.

Customizing Error Messages

The default error message for a rule can be customizable by defining it along with concern rule object as follows.

index.jsx

import { FormValidator } from '@syncfusion/ej2-inputs';
import { DialogComponent } from '@syncfusion/ej2-react-popups';
import * as React from 'react';
import * as ReactDOM from 'react-dom';
export default class Validation extends React.Component {
    dialogInstance;
    formObject;
    animationSettings = { effect: 'Zoom' };
    // Dialog will be closed, while clicking on overlay
    onOverlayClick() {
        this.dialogInstance.hide();
    }
    componentDidMount() {
        const options = {
            // validation rules
            rules: {
                'email': {
                    required: [true, '* Enter your email']
                },
                'password': {
                    required: [true, '* Enter your password']
                },
            }
        };
        // Initialize the form validator
        this.formObject = new FormValidator('#form1', options);
    }
    onSubmitClick() {
        if (this.formObject.validate()) {
            this.formObject.element.reset();
            this.dialogInstance.show();
        }
    }
    render() {
        return (<div className='control-pane'>
    <div className='control-section col-lg-12'>
      <div className='validation_wrapper'>
      <div className="control_wrapper" id="control_wrapper">
        <form id="form1" method="post">
          <div className="form-group">
            <div className="e-float-input">
              <input type="email" id="Email" name="email" data-msg-containerid="mailError"/>
              <span className="e-float-line"/>
              <label className="e-float-text e-label-top" htmlFor="email">Email</label>
            </div>
            <div id="mailError"/>
          </div>
          <div className="form-group">
            <div className="e-float-input">
              <input type="password" id="number" name="password" data-msg-containerid="noError"/>
              <span className="e-float-line"/>
              <label className="e-float-text e-label-top" htmlFor="password">Password</label>
            </div>
            <div id="noError"/>
          </div>
        </form>
        <br />
        <br />
        <div className="submitBtn">
          <button className="submit-btn e-btn" onClick={this.onSubmitClick = this.onSubmitClick.bind(this)} id="submit-btn">Submit</button>
        </div>
        <div id="confirmationDialog"/> </div>
      </div>
    </div>
    <DialogComponent id="defaultdialog" isModal={true} visible={false} content='Your details has been updated successfully, Thank you' animationSettings={this.animationSettings} width={'50%'} ref={dialog => this.dialogInstance = dialog} target={'.control-section'} overlayClick={this.onOverlayClick = this.onOverlayClick.bind(this)}/>
  </div>);
    }
}
ReactDOM.render(<Validation />, document.getElementById('form-element'));

index.tsx

import { select } from '@syncfusion/ej2-base';
import { FormValidator, FormValidatorModel } from '@syncfusion/ej2-inputs';
import { DialogComponent } from '@syncfusion/ej2-react-popups';
import * as React from 'react';
import * as ReactDOM from 'react-dom';

export default class Validation extends React.Component<{}, {}> {
public dialogInstance: DialogComponent;
public formObject: FormValidator;
private animationSettings: object = { effect: 'Zoom' };
  // Dialog will be closed, while clicking on overlay
  public onOverlayClick() {
        this.dialogInstance.hide();
  }
  public componentDidMount(): void {
        const options: FormValidatorModel = {
          // validation rules
         rules: {
          'email': {
            required: [true, '* Enter your email']
          },
          'password': {
            required: [true, '* Enter your password']
          },
        }
      };
      // Initialize the form validator
      this.formObject = new FormValidator('#form1', options);
  }

  public onSubmitClick(): void {
  if(this.formObject.validate()) {
    this.formObject.element.reset();
    this.dialogInstance.show();
      }
  }

public render(): JSX.Element {
  return (    <div className = 'control-pane'>
    <div className='control-section col-lg-12'>
      <div className='validation_wrapper'>
      <div className="control_wrapper" id="control_wrapper">
        <form id="form1"  method="post">
          <div className="form-group">
            <div className="e-float-input">
              <input type="email" id="Email" name="email" data-msg-containerid="mailError"/>
              <span className="e-float-line"/>
              <label className="e-float-text e-label-top" htmlFor="email" >Email</label>
            </div>
            <div id="mailError"/>
          </div>
          <div className="form-group" >
            <div className="e-float-input">
              <input type="password" id="number" name="password" data-msg-containerid="noError" />
              <span className="e-float-line"/>
              <label className="e-float-text e-label-top"  htmlFor="password" >Password</label>
            </div>
            <div id="noError"/>
          </div>
        </form>
        <br/>
        <br/>
        <div className="submitBtn">
          <button className="submit-btn e-btn" onClick={this.onSubmitClick = this.onSubmitClick.bind(this)} id="submit-btn">Submit</button>
        </div>
        <div id="confirmationDialog"/> </div>
      </div>
    </div>
    <DialogComponent id="defaultdialog" isModal={true} visible ={false} content = 'Your details has been updated successfully, Thank you' animationSettings={this.animationSettings} width={'50%'}  ref={dialog => this.dialogInstance = dialog!}
    target={'.control-section'} overlayClick={this.onOverlayClick=this.onOverlayClick.bind(this)} />
  </div>) }
}

ReactDOM.render(<Validation />, document.getElementById('form-element'));