option for settings previewhtml

src/js/easymde.js

@@ -936,7 +936,7 @@ function toggleSideBySide(editor) {
     var sideBySideRenderingFunction = function () {
         var newValue = editor.options.previewRender(editor.value(), preview);
         if (newValue != null) {
-            preview.innerHTML = newValue;
+            editor.options.setPreviewRender(preview, newValue);
         }
     };
 
@@ -947,7 +947,7 @@ function toggleSideBySide(editor) {
     if (useSideBySideListener) {
         var newValue = editor.options.previewRender(editor.value(), preview);
         if (newValue != null) {
-            preview.innerHTML = newValue;
+            editor.options.setPreviewRender(preview, newValue);
         }
         cm.on('update', cm.sideBySideRenderingFunction);
     } else {
@@ -1014,8 +1014,7 @@ function togglePreview(editor) {
             toolbar_div.className += ' disabled-for-preview';
         }
     }
-    preview.innerHTML = editor.options.previewRender(editor.value(), preview);
+    editor.options.setPreviewRender(preview, editor.options.previewRender(editor.value(), preview));
-
 }
 
 function _replaceSelection(cm, active, startEnd, url) {
@@ -1690,6 +1689,12 @@ function EasyMDE(options) {
         };
     }
 
+    if (!options.setPreviewRender) {
+      options.setPreviewRender = function (preview, html) {
+        preview.innerHTML = html;
+      };
+    }
+
 
     // Set default options for parsing config
     options.parsingConfig = extend({
@@ -2609,7 +2614,7 @@ EasyMDE.prototype.value = function (val) {
         if (this.isPreviewActive()) {
             var wrapper = cm.getWrapperElement();
             var preview = wrapper.lastChild;
-            preview.innerHTML = this.options.previewRender(val, preview);
+            this.options.setPreviewRender(preview, this.options.previewRender(val, preview));
         }
         return this;
     }