Refactor `OpenAssets` command

src/commands/view/OpenAssets.js

@@ -1,40 +1,38 @@
-const $ = Backbone.$;
-
 module.exports = {
   run(editor, sender, opts = {}) {
     const modal = editor.Modal;
     const am = editor.AssetManager;
     const config = am.getConfig();
+    const amContainer = am.getContainer();
     const title = opts.modalTitle || config.modalTitle || '';
-    var types = opts.types;
-    var accept = opts.accept;
+    const types = opts.types;
+    const accept = opts.accept;
 
     am.setTarget(opts.target);
     am.onClick(opts.onClick);
     am.onDblClick(opts.onDblClick);
     am.onSelect(opts.onSelect);
 
-    if (!this.rendered || types || accept) {
-      var $html;
-      var assets;
+    if (!this.rendered || types) {
+      let assets = am.getAll();
 
       if (types) {
-        assets = am.getAll().filter(asset => {
-          return types.indexOf(asset.get('type')) != -1
-        });
-      } else {
-        assets = am.getAll();
+        assets = assets.filter(a => types.indexOf(a.get('type')) !== -1);
       }
 
-      $html = $(am.render(assets));
-
-      if (accept) $html.find(`input#${config.stylePrefix}uploadFile`).attr('accept', accept);
-
+      am.render(assets);
       this.rendered = 1;
     }
 
+    if (accept) {
+      const uploadEl = amContainer.querySelector(
+        `input#${config.stylePrefix}uploadFile`
+      );
+      uploadEl && uploadEl.setAttribute('accept', accept);
+    }
+
     modal.setTitle(title);
-    modal.setContent(am.getContainer());
+    modal.setContent(amContainer);
     modal.open();
   }
 };