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Open a Dialog on condition in React Dialog component

You can prevent opening of the dialog by setting the beforeOpen event argument cancel value to true. In the following sample, the success dialog is opened when you enter the username value with minimum 4 characters. Otherwise, it will not be opened.

Source
Preview
App.tsx
App.css.jsx
App.jsx
index.jsx
import { DialogComponent } from '@syncfusion/ej2-react-popups';
import * as React from "react";
import './App.css';

class App extends React.Component<{}, {}> {
public userName: HTMLInputElement;
public password: HTMLInputElement;
public dialogInstance: DialogComponent;

private buttons: any = [{
    buttonModel: {
        content: 'DISMISS',
        cssClass: 'e-primary',
        isPrimary: true,
    },
    'click': () => {
        this.dialogInstance.hide();
    }
}];

public onSubmit(): void {
  this.dialogInstance.show();
}

public validation = (args: any): void => {
    if (this.userName.value === "" && this.password.value === "") {
        args.cancel= true;
        alert("Enter the username and password")
    } else if (this.userName.value === "") {
        args.cancel= true;
        alert("Enter the username")
    } else if (this.userName.value === "") {
        args.cancel= true;
        alert("Enter the password")
    } else if (this.userName.value.length < 4) {
        args.cancel= true;
        alert("Username must be minimum 4 characters")
    } else {
        args.cancel= false;
        this.userName.value = "";
        this.password.value = "";
    }
}
public onInputFocus = (args: any) => {
    if (!args.target.parentElement.classList.contains('e-input-in-wrap')) {
        args.target.parentElement.classList.add('e-input-focus');
    } else {
        args.target.parentElement.parentElement.classList.add('e-input-focus')
    }
}



public onInputBlur = (args: any) => {
    if (!args.target.parentElement.classList.contains('e-input-in-wrap')) {
    args.target.parentElement.classList.remove('e-input-focus');
    } else {
        args.target.parentElement.parentElement.classList.remove('e-input-focus');
    }
}

public render() {
    return (
    <div className='App' id='dialog-target'>
        <div className="login-form" >
            <div className='wrap'>
                <div id="heading">Sign in</div>
                <div className="e-float-input">
                    <input id="textvalue" type="text" required = {true} ref = {user => this.userName = user!} onFocus = {this.onInputFocus} onBlur = {this.onInputBlur}/>
                    <span className="e-float-line"/>
                    <label className="e-float-text">Username</label>
                </div>
                <div className="e-float-input">
                    <input id="textvalue2" type="password" required = {true} ref = {pwd => this.password = pwd!} onFocus = {this.onInputFocus} onBlur = {this.onInputBlur}/>
                    <span className="e-float-line"/>
                    <label className="e-float-text">Password</label>
                </div>
                <div className="button-contain">
                    <button className="e-control e-btn e-info" id="targetButton" role="button" e-ripple="true" onClick = {this.onSubmit = this.onSubmit.bind(this)}>Log in</button>
                </div>
            </div>
        </div>
    <DialogComponent id='dialog' header='Success' buttons={this.buttons} beforeOpen = {this.validation} content='Congratulations! Login Success' width='250px' isModal={true} ref={dialog => this.dialogInstance = dialog!} visible={false}
target='#dialog-target'/></div>
    )
}
}
export default App;
import { DialogComponent } from '@syncfusion/ej2-react-popups';
import * as React from "react";
import './App.css';
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.buttons = [{
                buttonModel: {
                    content: 'DISMISS',
                    cssClass: 'e-primary',
                    isPrimary: true,
                },
                'click': () => {
                    this.dialogInstance.hide();
                }
            }];
        this.validation = (args) => {
            if (this.userName.value === "" && this.password.value === "") {
                args.cancel = true;
                alert("Enter the username and password");
            }
            else if (this.userName.value === "") {
                args.cancel = true;
                alert("Enter the username");
            }
            else if (this.userName.value === "") {
                args.cancel = true;
                alert("Enter the password");
            }
            else if (this.userName.value.length < 4) {
                args.cancel = true;
                alert("Username must be minimum 4 characters");
            }
            else {
                args.cancel = false;
                this.userName.value = "";
                this.password.value = "";
            }
        };
        this.onInputFocus = (args) => {
            if (!args.target.parentElement.classList.contains('e-input-in-wrap')) {
                args.target.parentElement.classList.add('e-input-focus');
            }
            else {
                args.target.parentElement.parentElement.classList.add('e-input-focus');
            }
        };
        this.onInputBlur = (args) => {
            if (!args.target.parentElement.classList.contains('e-input-in-wrap')) {
                args.target.parentElement.classList.remove('e-input-focus');
            }
            else {
                args.target.parentElement.parentElement.classList.remove('e-input-focus');
            }
        };
    }
    onSubmit() {
        this.dialogInstance.show();
    }
    render() {
        return (<div className='App' id='dialog-target'>
        <div className="login-form">
            <div className='wrap'>
                <div id="heading">Sign in</div>
                <div className="e-float-input">
                    <input id="textvalue" type="text" required={true} ref={user => this.userName = user} onFocus={this.onInputFocus} onBlur={this.onInputBlur}/>
                    <span className="e-float-line"/>
                    <label className="e-float-text">Username</label>
                </div>
                <div className="e-float-input">
                    <input id="textvalue2" type="password" required={true} ref={pwd => this.password = pwd} onFocus={this.onInputFocus} onBlur={this.onInputBlur}/>
                    <span className="e-float-line"/>
                    <label className="e-float-text">Password</label>
                </div>
                <div className="button-contain">
                    <button className="e-control e-btn e-info" id="targetButton" role="button" e-ripple="true" onClick={this.onSubmit = this.onSubmit.bind(this)}>Log in</button>
                </div>
            </div>
        </div>
    <DialogComponent id='dialog' header='Success' buttons={this.buttons} beforeOpen={this.validation} content='Congratulations! Login Success' width='250px' isModal={true} ref={dialog => this.dialogInstance = dialog} visible={false} target='#dialog-target'/></div>);
    }
}
export default App;
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import App from './App';
ReactDOM.render(<App />, document.getElementById('container'));