Flutter Web js 获取 registerViewFactory 创建的页面元素

gistfile1.txt

// ignore:undefined_prefixed_name
  ui.platformViewRegistry.registerViewFactory('someViewType', (int viewId) {
    final wrapper = DivElement()
      ..style.width = '100%'
      ..style.height = '100%';

    /// FIX:
    /// https://github.com/flutter/flutter/issues/40080
    /// https://github.com/flutter/flutter/issues/50452
    /// document.getElementsByTagName('flt-platform-view')[0].shadowRoot.getElementById('plotly_div_id_')
    final script = ScriptElement();
    script.appendText(
        'embedpano({swf:"viewer/krpano.swf", xml:"viewer/krpano.xml", target:"pano", html5:"auto", mobilescale:1.0, passQueryParameters:true});');

//    final div = DivElement()
//      ..id = 'pano'

    var div = (querySelector('#pano') as DivElement)
      ..contentEditable = 'true'
      ..style.width = '100%'
      ..style.backgroundColor = 'red'
      ..style.height = '100%';

    div.append(script);
    wrapper.append(div);
    return wrapper;
  });