WebBrowser1無法獲得焦點

Question

各位大蝦，小弟在寫個自動輸入的DELPHI程序，但是網頁上的輸入框怎麼都獲取不到焦點，下面是網頁中的代碼：
<input name="ctl00$ctl00$ContentPlaceHolder1$ContentPlaceHolder1$R7GAW9GK9KFJ6E698" type="text" maxlength="10" id="ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_R7GAW9GK9KFJ6E698" style="margin-top:9px;" />
                            元<span class="fontGray" style="padding-left: 18px;"><span id="ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_rfvBidAmount" style="color:Red;visibility:hidden;"></span></span>小第的代碼是：
     var  t:Olevariant;
      str:='ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_R7GAW9GK9KFJ6E698';  \\該輸入框的ID
    t:= webbrowser2.OleObject.document.getElementById('str');
    t.value:='50.00';    \\想把50輸入到框中但是輸不進去啊！大蝦救命啊！

Answer 1

参考这个http://greatdnl.blog.163.com/blog/static/36681272200837101825641/
很久以前做过代码找不到了

Answer 2

http://topic.csdn.net/t/20020621/13/820780.html

Answer 3

看如此長的ID很有可能是變化的。每刷新一次變化一次，所有取ID是行不通的。如果不是變化的下麵一句定行
webbrowser2.OleObject.document.all.item('ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_R7GAW9GK9KFJ6E698',0).value:= "50.00";