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wp-content/plugins/duplicator-pro/assets/js/import-installer.js

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+/*! dup import installer */
+(function ($) {
+    DupliImportInstaller = {
+        installerIframe: $('#dupli-import-installer-iframe'),
+        init: function () {
+            DupliImportInstaller.installerIframe.on("load", function () {
+                DupliImportInstaller.installerIframe.contents()
+                    .find('#page-step1')
+                    .on('click', '> .ui-dialog #db-install-dialog-confirm-button', function () {
+                        $('#dupli-import-installer-modal').removeClass('no-display');
+                    });
+            });
+        },
+        resizeIframe: function () {
+            let height = DupliImportInstaller.installerIframe.contents()
+                .find('html').css('overflow', 'hidden')
+                .outerHeight(true);
+            console.log('height', height);
+            DupliImportInstaller.installerIframe.css({
+                'height': height + 'px'
+            })
+        }
+    }
+
+    DupliImportInstaller.init();
+    DuplicatorTooltip.load();
+
+})(jQuery);