search(type, attribute, search) {
    if (this.ready) {
      this.collections[type].search(attribute, search);
      this.collections[type].render();
    } else {
      handleMessage(msg['NOT_READY_WARNING']);
    }
  }
Search method for file collections.
@method
@param {string} type - Type of file collection.
@param {string} attribute - File attribute to search.
@param {string} search - Search query.