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Determine whether Uploader has File Input in Vue Uploader component

By setting required attribute to uploader input element, you can validate the file input has any value in it. In the below sample, set required attribute to the uploader input element and showcase the validation failure message using data-required-message attribute.

Source
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app.vue
<template>
        <div class="col-lg-12 control-section">
            <h4 class="form-title">Photo Contest</h4>
        <div class="control_wrapper" id ="control_wrapper">
            <form id="form1" method="post">
                <div class="form-group" style="padding-top: 40px; float: left">
                    <div class="e-float-input">
                        <input type="text" id="name" name="name" data-required-message="* Enter your name" required="" data-msg-containerid="nameError">
                        <span class="e-float-line"></span>
                        <label class="e-float-text e-label-top" for="name">Name</label>
                    </div>
                    <div id="nameError"></div>
                </div>
                <div id="dropArea">
                    <div id="uploadError" style='float: right;'></div>
                    <div id='customBrowse' class="form-group dropUpload">   Drop image here...
                    <ejs-uploader ref="uploadObj" id='defaultfileupload' name="UploadFiles" :selected="onFileSelect" :autoUpload="autoUpload"></ejs-uploader>
                    </div>
                    </div>
                <div class="submitBtn">
                    <button type="button" class="submit-btn e-btn" id="submit-btn">Submit</button>
                    <div class="desc"><span>*This button is not a submit type and the form submit handled from externally.</span></div>
                    <ejs-dialog id='uploadAlert' :header='header' showCloseIcon=true :width= 'width' :content= 'dlgContent' :target= 'dlgTarget'
                :isModal= 'Modal' :visible="false" :animationSettings= 'animation' ref="dialogObj" >
                </ejs-dialog>
                </div>
            </form>
        </div>
    </div>
</template>
<script>
import Vue from 'vue';
import { UploaderPlugin } from '@syncfusion/ej2-vue-inputs';
import { FormValidator  } from '@syncfusion/ej2-inputs';
import { DialogPlugin } from '@syncfusion/ej2-vue-popups';
import { createElement, detach } from '@syncfusion/ej2-base';
Vue.use(UploaderPlugin);
Vue.use(DialogPlugin);

export default {
  data: function(){
        return {
          dropElement: '.control-fluid',
          extensions: '.jpg, .png',
          isAuto: false,
          formObj: '',
          header: 'Success',
          animation: {effect: 'zoom'},
          Modal: true,
          dlgTarget: '.control_wrapper',
          dlgContent: 'Your details have been updated successfully, Thank you.',
          width: '335px',
            autoUpload: false
        }
    },
    mounted: function() {
          let rules;
           let options = {
        //Initialize the CustomPlacement.
            customPlacement: function(inputElement, errorElement) {
                inputElement = inputElement.closest('.form-group').querySelector('.error');
                inputElement.parentElement.appendChild(errorElement);
            },
             rules = {
                    'Name': {
                        required: true
                    },
                    'upload': {
                        required: true
                    }
                }
            }
    this.formObj = new FormValidator('#form1', options);
let localObj = this;
document.getElementById('submit-btn').onclick =             function() {
            localObj.onFormSubmit();
        };
        document.getElementById('customBrowse').onclick = () => {
    document.getElementsByClassName('e-file-select-wrap')[0].querySelector('button').click();
};
  this.$refs.uploadObj.$el.setAttribute('data-required-message', '* Choose your image to upload');
   this.$refs.uploadObj.$el.setAttribute('required', '');
  this.$refs.uploadObj.$el.setAttribute('data-msg-containerid', 'uploadError');
    },
    methods:{
    customBrowse: function() {
        document.getElementsByClassName('e-file-select-wrap')[0].querySelector('button').click();
    },
    onFileSelect: function(args: any): void {
    if (args.filesData.length > 0) {
        if (document.getElementsByClassName('upload-image').length > 0) {
            detach(document.getElementsByClassName('imgWrapper')[0]);
        }
        let imageTag = createElement('IMG', { className: 'upload-image', attrs: { 'alt': 'Image' } });
let wrapper = createElement('span', { className: 'imgWrapper' });
        wrapper.appendChild(imageTag);
            let rootFile = document.getElementsByClassName('dropUpload')[0];
rootFile.insertBefore(wrapper, rootFile.firstChild);
        this.readURL(wrapper, args.filesData[0]);
    }
    args.cancel = true;
},
readURL: function(li, args) {
    let preview = li.querySelector('.upload-image');
    let file: File = args.rawFile;
    let reader: FileReader = new FileReader();
    reader.addEventListener('load', () => { preview.src = reader.result; }, false);
    if (file) { reader.readAsDataURL(file); }
},

onFormSubmit: function(){
let formStatus = this.formObj.validate();
if (formStatus) {
        this.formObj.element.reset();
        detach(document.getElementsByClassName('imgWrapper')[0]);
        this.$refs.dialogObj.show();
    }
}
}
}
</script>
<style>
@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-buttons/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";
 #container {
        visibility: hidden;
        padding-left: 5%;
        width: 100%;
    }
    #loader {
        color: #008cff;
        font-family: 'Helvetica Neue','calibiri';
        font-size: 14px;
        height: 40px;
        left: 45%;
        position: absolute;
        top: 45%;
        width: 30%;
    }
    .address-field {
  resize: none;
}
input#fileupload {
    opacity: 0;
}
#dropArea .dropUpload .upload-image {
  height: 140px;
  width: 140px;
}
#dropArea .dropUpload {
  float: right;
  text-align: center;
  vertical-align: middle;
  line-height: 12;
  overflow: hidden;
  border: 1px dashed;
  width: 150px;
  height: 150px;
}
.e-upload {
  visibility: hidden;
}
#control_wrapper {
  max-width: 500px;
  margin: auto;
  border: 0.5px solid #BEBEBE;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.36);
  padding: 1% 4% 7%;
  background: #f9f9f9;
}
.e-error {
  padding-top:3px;
}
.control_wrapper .e-upload .e-upload-drag-hover {
  margin: 0;
}

.submit-btn {
  margin-top: 145px;
}
.submitBtn .desc {
  margin: 2% 23% 0 18%;
}
.submitBtn {
  text-align: center;
}
.form-support {
  width: 100%;
}
.success .form-support {
  display: none;
}
.success .successmsg {
  border: 0.5px solid green;
  padding: 10%;
  color: green;
}
#form1 {
  position: relative;
  top: 14%;
}
.form-support td {
  width: 100%;
  padding-top:4%;
}
.e-upload {
  float: none;
}
.choose-file{
  width: 60%;
}
#browse {
  float: right;
  margin-right: -113px;
  margin-top: -27px;
}
.form-title {
  text-align: center;
}

</style>