s:='document.getElementById(''dropProductSeries'').selectedIndex =1;'+
' ev=document.createEvent("HTMLEvents");ev.initEvent("onchange", false, true); var b=document.getElementById(''dropProductSeries''); b.dispatchEvent(ev);';
self.Chromium1.Browser.MainFrame.ExecuteJavaScript(s,'about:blank',0);

 

上面的 和下面 的都可以   change  onchange 都测试成功 哈哈

 

s:='document.getElementById(''dropProductSeries'').selectedIndex =1;'+
' ev=document.createEvent("HTMLEvents");ev.initEvent("change", false, true); var b=document.getElementById(''dropProductSeries''); b.dispatchEvent(ev);';
self.Chromium1.Browser.MainFrame.ExecuteJavaScript(s,'about:blank',0);