iframeswitcher.phtml

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<?php
// @codingStandardsIgnoreFile

?>
<div id="preview" class="cms-revision-preview">
    <div class="toolbar">
        <?php if (!$block->isSingleStoreMode()) :?>
        <div class="store-switcher">
            <?= $block->getChildHtml('store_switcher') ?>
        </div>
        <?php endif;?>
    </div>
    <iframe name="preview_iframe" id="preview_iframe" frameborder="0" title="<?= $block->escapeHtmlAttr(__('Preview')) ?>" width="100%"></iframe>
    <?= $block->getChildHtml('preview_form') ?>
</div>

<script>
require(['jquery', 'loadingPopup', 'prototype'], function(jQuery){

//<![CDATA[
var previewForm = $('preview_form');
var previewIframe = $('preview_iframe');

function preview() {
    previewForm.writeAttribute('target', previewIframe.readAttribute('id'));
    blockPreview();
    previewForm.submit();
}

function blockPreview() {
    jQuery('body').loadingPopup({
        timeout: false
    });
}

function unBlockPreview() {
    jQuery('body').trigger('hideLoadingPopup');
}

jQuery(document).ready(preview);
jQuery(previewIframe).ready(unBlockPreview);

jQuery("#preview_iframe").load(function() {
    jQuery(this).height(jQuery(this).contents().find("html").height() );
});

//]]>

});
</script>