Relative url addresses in <a> and <img> support

[alp1396]

Is it possible to add an "BaseURL" option?
In my case all the links and images comes from API with relative path href="/some/url/there".
So, it would be nice to prefix them with custom String param.

[alp1396]

Temporary solution for images that works for me. Using customRender() to override processing.

Html(
  data: '<img src="/an/relative/image.jpg">',
  useRichText: false,
  customRender: (node, children) {
    if (node is dom.Element) {
      switch (node.localName) {
        case "img":
          if (node.attributes.containsKey('src')) {
            return Image('http://mydomain.com' + node.attributes['src']);
          }
      }
    }
  },
);

Note that you need to add dart:html package to get dom.Element check.

[Sub6Resources]

Pull request #146 will fix this issue for images. Relative urls in the a tag should be able to be handled in the onLinkTap function.