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Prevent Opening of the Dialog in Vue 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.vue
<template>
  <div>
    <div id="dialogTarget" class="control-section; position:relative" style="height:300px;">
        <div class="login-form">
                <div class='wrap'>
                    <div id="heading">Sign in</div>
                    <div class="e-float-input">
                        <input id="textvalue" type="text" required/>
                        <span class="e-float-line"></span>
                        <label class="e-float-text">Username</label>
                    </div>
                    <div class="e-float-input">
                        <input id="textvalue2" type="password" required/>
                        <span class="e-float-line"></span>
                        <label class="e-float-text">Password</label>
                    </div>
                    <div class="button-contain">
                        <ejs-button id="dialogbtn" cssClass="e-info" v-on:click.native="dialogBtnClick" >Log in</ejs-button>
                    </div>
                </div>
            </div>
        <ejs-dialog id="dialog" ref="Dialog" :header='header' :isModal='isModal' :target='target' :width='width' :buttons='buttons' :animationSettings='animationSettings' :visible='visible' :content='content' :beforeOpen="validation" :close="modalDlgClose">
        </ejs-dialog>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { DialogPlugin } from '@syncfusion/ej2-vue-popups';
import { ButtonPlugin } from '@syncfusion/ej2-vue-buttons';
Vue.use(DialogPlugin);
Vue.use(ButtonPlugin);

export default {
    data: function() {
        return {
            target: "#dialogTarget",
            width: '250px',
            visible: false,
            header: 'Success',
            isModal: true,
            content: 'Congratulations! Login Success',
            buttons: [{ click: this.dlgButtonClick, buttonModel: { content: 'Dismiss', isPrimary: true } }],
            isModal: true,
            animationSettings: { effect: 'None' }
        }
    },
    mounted: function(){
        document.getElementById('dialogbtn').focus();
    },
    methods: {
        dialogBtnClick: function() {
            this.$refs.Dialog.show();
        },
        modalDlgClose: function() {
            document.getElementById('dialogbtn').style.display = '';
        },
        dlgButtonClick: function() {
            this.$refs.Dialog.hide();
        },
        validation: function(args) {
            let text = document.getElementById('textvalue');
            let text1 = document.getElementById('textvalue2');
            if (text.value === "" && text1.value === "") {
                args.cancel= true;
                alert("Enter the username and password")
            } else if (text.value === "") {
                args.cancel= true;
                alert("Enter the username")
            } else if (text1.value === "") {
                args.cancel= true;
                alert("Enter the password")
            } else if (text.value.length < 4) {
                args.cancel= true;
                alert("Username must be minimum 4 characters")
            } else {
                args.cancel= false;
                document.getElementById("textvalue").value = "";
                document.getElementById("textvalue2").value = "";
            }
        }
    }
}
</script>
<style>
@import "../../node_modules/@syncfusion/ej2-vue-popups/styles/material.css";

    #app {
        color: #008cff;
        height: 40px;
        left: 45%;
        position: absolute;
        top: 45%;
        width: 30%;
    }
    .control-section {
        height: 100%;
        min-height: 200px;
    }
    .wrap {
        box-sizing: border-box;
        margin: 0 auto;
        padding: 20px 30px;
        width: 340px;
        background: #f7f7f7;
    }
    .wrap .e-float-input { /* csslint allow: adjoining-classes */
        margin: 17px 0;
    }

    .text-center {
        text-align: center;
    }

    #content {
        margin-top: 12px;
    }

    .button-contain {
        padding: 20px 0 0;
        width: 100%;
    }

    .button-contain .e-btn { /* csslint allow: adjoining-classes */
        width: 100%;
        height: 36px;
    }

    #heading {
        color: #333;
        font-weight: bold;
        margin: 0 0 15px;
        text-align: center;
        font-size: 20px;
    }

    .login-form {
        width: 340px;
        margin: 50px auto;
    }

    #dialog.e-dialog .e-footer-content {
        text-align: center;
    }
</style>