DELPHI XE8如何使用IDHTTP提交查询数据并网页中的查询按钮

[dglb73]

ASP网页中的源码如下：

                 <td style="width: 500px; font-size: 10pt;">
                            编号<input name="txt_ph" id="txt_ph" onkeydown="if(event.which || event.keyCode){  if ((event.which == 13) || (event.keyCode == 13)) {  document.getElementById('Btn_Seach').click();return false;}} else {return true}; " style="width:120px;" type="text">
                            名称<input name="txt_pm" id="txt_pm" onkeydown="if(event.which || event.keyCode){  if ((event.which == 13) || (event.keyCode == 13)) {  document.getElementById('Btn_Seach').click();return false;}} else {return true}; " style="width:120px;" type="text">
                            规格<input name="txt_gg" id="txt_gg" onkeydown="if(event.which || event.keyCode){  if ((event.which == 13) || (event.keyCode == 13)) {  document.getElementById('Btn_Seach').click();return false;}} else {return true}; " style="width:120px;" type="text">
                        </td>
                      
                        <td>
                            <input name="Btn_Seach" value="查询" onclick="javascript:__doPostBack('Btn_Seach','')" id="Btn_Seach" style="height:25px;width:80px;" type="button">
                        </td>

想用IDHTTP提交查询，在编号栏输入“20301” ，然后按 “查询” 按钮 。用DELPHI要怎样写呢？