Validation events in React Form validator component

30 Jan 202315 minutes to read

Validation events have two types of events. These are

• validationBegin
• validationComplete

Validation Begin

validationBegin event triggers before the validation starts and also it invoke for each rules in validation process. Please find the below code snippet.

validationBegin: function(args) {
        // ("Validation begin");
      },

The following values are passed in args. You can use this values in event validation.

Fields	Description
element	Specifies the input element
name	Specifies the event name (validationBegin)
param	Specifies the param value (true/false)
value	Specifies the input value

Validation Complete

validationComplete event triggered after validation is completed and also it invoke for each rules in validation process. Please find the below code snippet.

validationComplete: function(args) {
        // ("Validation complete");
      }

The following values are passed in args. You can use this values in event validation.

Fields	Description
element	Specifies the input element
name	Specifies the event name (validationComplete)
param	Specifies the param value (true/false)
value	Specifies the input value
status	Specifies the status (success/failure)
inputName	Specifies the type of input

Please find the simple sample for validation events.

index.jsx

import { enableRipple } from '@syncfusion/ej2-base';
import { FormValidator } from '@syncfusion/ej2-inputs';
import { TimePickerComponent } from '@syncfusion/ej2-react-calendars';
import * as React from "react";
import * as ReactDOM from "react-dom";
// enable ripple effect
enableRipple(true);
export default class App extends React.Component {
    componentDidMount() {
        // add the rules for validation
        const options = {
            // validation begin event
            validationBegin: (args) => {
                const span = document.createElement("span");
                span.innerHTML = "Validation begin <hr>";
                const log = document.getElementById("EventLog");
                log.insertBefore(span, log.firstChild);
            },
            // validation complete event
            validationComplete: (args) => {
                if (args.status === "success") {
                    const span = document.createElement("span");
                    span.innerHTML = "Validation complete success <hr>";
                    const log = document.getElementById("EventLog");
                    log.insertBefore(span, log.firstChild);
                }
                else {
                    const span = document.createElement("span");
                    span.innerHTML = "Validation complete failure <hr>";
                    const log = document.getElementById("EventLog");
                    log.insertBefore(span, log.firstChild);
                }
            },
        };
        // initialize the form validator
        const formObject = new FormValidator('#form1', options);
        formObject.addRules('timepicker', { required: true });
        document.getElementById('clear').addEventListener('click', () => {
            document.getElementById("EventLog").innerHTML = "";
        });
    }
    render() {
        return (<div>
            <div id='sample'>
                <form id='form1' method="post">
                    <div className='content-wrapper'>
                        <TimePickerComponent id="timepicker" placeholder="Select a Time"/>
                    </div>
                    <label className='e-error' id='timepickerError' htmlFor='timepicker'/>
                </form>
            </div>
            <div id="list_event">
            <h4><b>Event Trace</b></h4>
            <div id="evt">
                <div className="eventarea">
                    {/*Event log element */}
                    <span className="EventLog" id="EventLog"/>
                </div>
                <div className="evtbtn">
                    {/*clear button element */}
                    <button className='e-btn' id="clear"> Clear </button>
                </div>
            </div>
        </div>
        </div>);
    }
}
ReactDOM.render(<App />, document.getElementById('form-element'));

index.tsx

import { enableRipple } from '@syncfusion/ej2-base';
import { FormEventArgs, FormValidator, FormValidatorModel, ValidArgs } from '@syncfusion/ej2-inputs';
import { TimePickerComponent } from '@syncfusion/ej2-react-calendars';
import * as React from "react";
import * as ReactDOM from "react-dom";

// enable ripple effect
enableRipple(true);

export default class App extends React.Component<{}, {}> {
  public componentDidMount(): void {
        // add the rules for validation
         const options: FormValidatorModel = {
            // validation begin event
            validationBegin: (args: ValidArgs) => {
              const span = document.createElement("span");
              span.innerHTML = "Validation begin <hr>";
              const log = document.getElementById("EventLog") as HTMLElement;
              log.insertBefore(span, log.firstChild);
            },
            // validation complete event
            validationComplete: (args: FormEventArgs) => {
                if (args.status === "success") {
                  const span = document.createElement("span");
                  span.innerHTML = "Validation complete success <hr>";
                  const log = document.getElementById("EventLog") as HTMLElement;
                  log.insertBefore(span, log.firstChild);
                } else {
                  const span = document.createElement("span");
                  span.innerHTML = "Validation complete failure <hr>";
                  const log = document.getElementById("EventLog") as HTMLElement;
                  log.insertBefore(span, log.firstChild);
                }
            },  
        };
        // initialize the form validator
        const formObject: FormValidator = new FormValidator('#form1', options);
        formObject.addRules('timepicker', {required: true});
        (document.getElementById('clear') as HTMLElement).addEventListener('click', () => {
            (document.getElementById("EventLog") as HTMLElement).innerHTML = "";
        });  
    }

    public render() {
        return(
            <div>
            <div id='sample'>
                <form id='form1' method="post">
                    <div className='content-wrapper'>
                        <TimePickerComponent id="timepicker" placeholder="Select a Time"/>
                    </div>
                    <label className='e-error' id='timepickerError' htmlFor='timepicker'/>
                </form>
            </div>
            <div id="list_event">
            <h4><b>Event Trace</b></h4>
            <div id="evt">
                <div className="eventarea" >
                    {/*Event log element */}
                    <span className="EventLog" id="EventLog"/>
                </div>
                <div className="evtbtn">
                    {/*clear button element */}
                    <button className='e-btn' id="clear"> Clear </button>
                </div>
            </div>
        </div>
        </div>
        );
    }
}
ReactDOM.render(<App />, document.getElementById('form-element'));