newsupernova/vendor/magento/module-cms/view/adminhtml/templates/browser/content/uploader.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

/** @var $block \Magento\Cms\Block\Adminhtml\Wysiwyg\Images\Content\Uploader */

$filters = $block->getConfig()->getFilters() ?? [];
$allowedExtensions = [];

foreach ($filters as $media_type) {
    $allowedExtensions = array_merge($allowedExtensions, array_map(function ($fileExt) {
        return ltrim($fileExt, '.*');
    }, $media_type['files']));
}

$resizeConfig = $block->getImageUploadConfigData()->getIsResizeEnabled()
    ? "{action: 'resize', maxWidth: "
        . $block->escapeHtml($block->getImageUploadMaxWidth())
        . ", maxHeight: "
        . $block->escapeHtml($block->getImageUploadMaxHeight())
        . "}"
    : "{action: 'resize'}";
?>

<div id="<?= $block->getHtmlId() ?>" class="uploader">
    <span class="fileinput-button form-buttons">
        <span><?= $block->escapeHtml(__('Upload Images')) ?></span>
        <input class="fileupload" type="file" name="<?= $block->escapeHtmlAttr($block->getConfig()->getFileField()) ?>" data-url="<?= $block->escapeUrl($block->getConfig()->getUrl()) ?>" multiple>
    </span>
    <div class="clear"></div>
    <script type="text/x-magento-template" id="<?= $block->getHtmlId() ?>-template">
        <div id="<%- data.id %>" class="file-row">
            <span class="file-info"><%- data.name %> (<%- data.size %>)</span>
            <div class="progressbar-container">
                <div class="progressbar upload-progress" style="width: 0%;"></div>
            </div>
            <div class="clear"></div>
        </div>
    </script>
    <script>
require([
    'jquery',
    'mage/template',
    'Magento_Ui/js/lib/validation/validator',
    'Magento_Ui/js/modal/alert',
    'jquery/file-uploader',
    'domReady!',
    'mage/translate'
], function ($, mageTemplate, validator, uiAlert) {
    var maxFileSize = <?= $block->escapeJs($block->getFileSizeService()->getMaxFileSize()) ?>,
        allowedExtensions = '<?= $block->escapeHtml(implode(' ', $allowedExtensions)) ?>';

    $('#<?= $block->getHtmlId() ?> .fileupload').fileupload({
        dataType: 'json',
        formData: {
            isAjax: 'true',
            form_key: FORM_KEY
        },
        sequentialUploads: true,
        acceptFileTypes: /(\.|\/)(gif|jpe?g|png)$/i,
        allowedExtensions: allowedExtensions,
        maxFileSize: maxFileSize,
        dropZone: $('#<?= $block->getHtmlId() ?>').closest('[role="dialog"]'),
        add: function (e, data) {
            var progressTmpl = mageTemplate('#<?= $block->getHtmlId() ?>-template'),
                fileSize,
                tmpl,
                validationResult;

            data.files = data.files.filter(function (file) {
                fileSize = typeof file.size == "undefined" ?
                    $.mage.__('We could not detect a size.') :
                    byteConvert(file.size);

                if (maxFileSize) {
                    validationResult = validator('validate-max-size', file.size, maxFileSize);

                    if (!validationResult.passed) {
                        uiAlert({
                            content: validationResult.message
                        });

                        return false;
                    }
                }

                if (allowedExtensions) {
                    validationResult = validator('validate-file-type', file.name, allowedExtensions);

                    if (!validationResult.passed) {
                        uiAlert({
                            content: validationResult.message
                        });

                        return false;
                    }
                }

                data.fileId = Math.random().toString(36).substr(2, 9);

                tmpl = progressTmpl({
                    data: {
                        name: file.name,
                        size: fileSize,
                        id: data.fileId
                    }
                });

                $(tmpl).data('image', data).appendTo('#<?= $block->getHtmlId() ?>');

                return true;
            });

            if (data.files.length) {
                $(this).fileupload('process', data).done(function () {
                    data.submit();
                });
            }
        },
        done: function (e, data) {
            var progressSelector = '#' + data.fileId + ' .progressbar-container .progressbar';
            var tempErrorMessage = document.createElement("div");
            $(progressSelector).css('width', '100%');
            $('[data-action="show-error"]').children(".message").remove();
            if (data.result && !data.result.hasOwnProperty('errorcode')) {
                $(progressSelector).removeClass('upload-progress').addClass('upload-success');
            } else {
                tempErrorMessage.className = "message message-warning warning";
                tempErrorMessage.innerHTML = data.result.error;

                $('[data-action="show-error"]').append(tempErrorMessage);
                $(progressSelector).removeClass('upload-progress').addClass('upload-failure');
            }
        },
        progress: function (e, data) {
            var progress = parseInt(data.loaded / data.total * 100, 10);
            var progressSelector = '#' + data.fileId + ' .progressbar-container .progressbar';
            $(progressSelector).css('width', progress + '%');
        },
        fail: function (e, data) {
            var progressSelector = '#' + data.fileId + ' .progressbar-container .progressbar';
            $(progressSelector).removeClass('upload-progress').addClass('upload-failure');
        }
    });

    $('#<?= $block->getHtmlId() ?> .fileupload').fileupload('option', {
        process: [{
            action: 'load',
            fileTypes: /^image\/(gif|jpeg|png)$/,
            maxFileSize: <?= (int) $block->getFileSizeService()->getMaxFileSize() ?> * 10
        },
        <?= /* @noEscape */ $resizeConfig ?>,
        {
            action: 'save'
        }]
    });
});
</script>
</div>