Martial-arts film star Jackie Chan's planned visit to Vietnam for a charity has been cancelled following an online backlash related to Beijing's expansive claims in the disputed South China Sea.

The Hong Kong-born actor was set to visit Hanoi on November 10 to support Operation Smile, a charity that gives free surgery to children with facial disfigurements.

But the plans were scrapped after thousands of angry Facebook users flooded the charity's official page when his visit was announced last week.

Some of their comments claimed Chan had spoken in support of China's so-called nine-dash line - its historic justification for its territorial claims in the resource-rich sea.

However, Chan has not explicitly expressed public support for the controversial maritime assertion.

Vietnam, Malaysia, the Philippines, Taiwan and Brunei all have competing claims in the waterway that overlap with China's - long a source of tension in the region.

Copyright Agence France-Presse, 2019