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Prevent Closing of Modal Dialog in Vue Dialog component

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

Source
Preview
app.vue
<template>
  <div>
    <div id="dialogTarget" class="control-section; position:relative" style="height:350px;">
        <!-- Render Button to open the modal Dialog -->
        <ejs-button id='dlgbtn' v-on:click.native="dlgBtnClick">Open Dialog</ejs-button>
        <!-- Render modal Dialog -->
        <ejs-dialog ref="modalDialog"  :isModal='isModal':beforeClose="validation" :header='header' :target='target' :width='width' :buttons='buttons' :animationSettings='animationSettings' :close="modalDlgClose" >
            <div class='wrap'>
                  <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>
        </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: '300px',
            header: 'Sign in',
            buttons: [{ click: this.dlgButtonClick, buttonModel: { content: 'log in', isPrimary: true } }],
            isModal: true,
            animationSettings: { effect: 'None' }
        }
    },
    mounted: function(){
        document.getElementById('dlgbtn').focus();
    },
    methods: {
        dlgBtnClick: function() {
            this.$refs.modalDialog.show();
        },
        modalDlgClose: function() {
            document.getElementById('dlgbtn').style.display = '';
        },
        dlgButtonClick: function() {
            this.$refs.modalDialog.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;
    width: 260px;
    }
    .e-dlg-container .e-float-input {
    margin: 17px 0;
    }
    .e-dlg-container .wrap .e-control .e-btn {
        margin: 3% 26%;
    }

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

    #content {
        margin-top: 12px;
    }

    .e-dlg-container .e-footer-content {
        padding: 20px 0 0;
        width: 100%;
    }

    .e-dlg-container .e-dialog .e-footer-content .e-btn {
        width: 100%;
        height: 36px;
        margin-left: 0px;
    }

    .e-dlg-container .e-dialog .e-footer-content {
        padding: 0 18px 18px;
    }
    .e-dlg-container .e-dialog .e-dlg-header-content .e-dlg-header {
        color: #333;
        font-weight: bold;
        text-align: center;
        width:  100%;
        font-size: 20px;
    }
</style>