if folder exists, return true

I can check if a folder is empty.

this.emptyfolder =开发者_JS百科 function(folderid) {
    result = PlacesUtils.getFolderContents(folderid);
    resultContainerNode = result.root;
    if (resultContainerNode.ChildCount == 0) {
        return true;
    } else {
        return false;
    }
}

How to check if a folder exists even if it's empty?

• link to the PlacesUtils description
• link to the PlacesUtils code

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many bookmarks service methods will throw if and item id does not exist, so for example PlacesUtils.bookmarks.getItemType(itemId); will throw. But actually, I'm missing your use-case, when working with folders you usually work with views, and you the don't bother about the fact a certain item id exists.