title: Why JScript runtime error: Object expected
body: <p>I am trying to use jquery or jscript to click a hidden button and I always get
  "Microsoft JScript runtime error: Object expected" error.</p>
  
  <p>I have tried all of the following (all with the same results):</p>
  
  <pre><code>$('#btnCompleteHidden').click();or:
  $('#btnCompleteHidden').trigger('click');With plain JavaScript:
  document.getElementById('btnCompleteHidden').onclick();
  $('#&lt;%=btnCompleteHidden.ClientID %&gt;').click();Or:
  document.getElementById('&lt;%=btnCompleteHidden.ClientID %&gt;').click();
  </code></pre>
  
  <p>I have tried making the button visible and still the same results.</p>
  
  <p>I will post the aspx page here:</p>
  
  <p></p>
  
  
  
  <pre><code>    &lt;script type="text/javascript"&gt;
          function FileDownloader_DownloadStep(Step){
          //The file list is going to be downloaded - "2 = About to Start" 
          if (Step == 2){
              //Dynamically build the filelist for the downloader
              getFileDownloader("FileDownloader").setFileList("GetFileList.aspx");
          }
          //The user has confirmed the download - "6 = File Download About to Start"
          if (Step == 6){
              //Perform the initialization updates to the first file only
              var xmlhttp; 
              if (typeof XMLHttpRequest != 'undefined') { 
                  xmlhttp = new XMLHttpRequest(); 
              } 
              if (!xmlhttp) { 
                  throw "Browser doesn't support XMLHttpRequest."; 
              } 
              var data = ""; 
              xmlhttp.open("POST", "UpdateVideoInitiated.aspx", true); 
              //Send the proper header information along with the request 
              xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
               //xmlhttp.setRequestHeader("Content-length", data.length); 
              xmlhttp.setRequestHeader("Connection", "close"); 
              xmlhttp.send(data); 
          }
      }
          function onDownloadItemComplete(Result, ErrorPage, Url, FileName, ContentType, FileSize){
              var xmlhttp;
              var data;
  
              //The handler will display the error description or updates as noted
              switch (Result){
                          //Update the completed file as complete and then perform initialization updates to the next file only
                  case 1: if (typeof XMLHttpRequest != 'undefined') { 
                              xmlhttp = new XMLHttpRequest(); 
                          } 
                          if (!xmlhttp) { 
                              throw "Browser doesn't support XMLHttpRequest."; 
                          } 
                          data = FileName; 
                          xmlhttp.open("POST", "UpdateVideoDownloaded.aspx?FileName=" + FileName + "&amp;FileSize=" + FileSize, true); 
                          //Send the proper header information along with the request 
                          xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
                           //xmlhttp.setRequestHeader("Content-length", data.length); 
                          xmlhttp.setRequestHeader("Connection", "close"); 
                          xmlhttp.send(data); 
                          break;
                  case 2: alert("An error has occurred while downloading the file " + FileName);
                          break;
                          //Update any skipped files to back off the initialization updates to the passed file only
                  case 3: if (typeof XMLHttpRequest != 'undefined') { 
                              xmlhttp = new XMLHttpRequest(); 
                          } 
                          if (!xmlhttp) { 
                              throw "Browser doesn't support XMLHttpRequest."; 
                          } 
                          data = FileName; 
                          xmlhttp.open("POST", "UpdateVideoSkipped.aspx?FileName=" + FileName, true); 
                          //Send the proper header information along with the request 
                          xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
                           //xmlhttp.setRequestHeader("Content-length", data.length); 
                          xmlhttp.setRequestHeader("Connection", "close"); 
                          xmlhttp.send(data); 
                          break;        
                  case 4: alert("The server returned a wrong MIME type (should be " + ContentType + ") for the file " + FileName);
                          break;
                  case 5: alert("The server returned a wrong size (should be " + FileSize + ") for the file " + FileName);
                          break;
                  case 6: alert("An error has occurred while writing the file " + FileName + " to disk");
                          break;
                  case 7: alert("The file " + FileName + " could not be found on the " + "server");
                          break;
                  case 8: alert("Access to the file " + FileName + " denied");
                          break;
                  case 9: alert("Time out while downloading the file " + FileName);
                          break;
              }
          }
          function onDownloadComplete(Result){
              //The handler will display the error description
              switch (Result){
                          //Update the member download statistics and rebind the grid 
                  case 0: $('#btnCompleteHidden').click();
                          break;
                  case 1: alert("An error has occurred while creating the file list");
                          break;        
                  case 2: alert("An error has occurred while downloading the file list");
                          break;
                  case 3: alert("The file list is empty");
                          break;
                  case 7: alert("The file list could not be found on the server");
                          break;
                  case 8: alert("Access to the file list denied");
                          break;
                  case 9: alert("Time out while downloading the file list");
                          break;
              }
          }
  &lt;/script&gt;
  </code></pre>
  
  <p>
  </p>
  
  <pre><code>&lt;div class="borderDiv"&gt;
       &lt;table cellspacing="0" class="borderTable0" width="100%"&gt;
           &lt;tr&gt;
              &lt;td class="Subhdr" &gt;
                  &lt;asp:label id="lblScreenHeader" Cssclass="ScreenHdr" runat="server" Height="24px"&gt;Member Video Download Detail&lt;/asp:label&gt;
              &lt;/td&gt;
          &lt;/tr&gt;
      &lt;/table&gt;
      &lt;div class="NinetyNine5PercentWide SolidThreePixelBorder" style="background-color:White"&gt;
          &lt;div class="OneHundredPercentWide EightPixelTopMargin TenPixelBottomMargin"&gt;
              &lt;div class="FileListHdr"&gt;
                  &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;
                  &lt;span&gt;Current Escrow Balance (Available for Future Use):&lt;/span&gt;
                  &amp;nbsp;&amp;nbsp;
                  &lt;asp:label ID="lblAvailableBalance" Cssclass="FileListHdr" runat="server" &gt;$280.00&lt;/asp:label&gt;
                  &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;
                  &lt;asp:label ID="lblAvailableBalanceMessage" Cssclass="FileListHdr" runat="server" &gt;&lt;/asp:label&gt;
              &lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="NinetyNinePercentWide"&gt;
              &lt;div class="FileListHdr EightPixelBottomMargin"&gt;
                  &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;
                  &lt;span class="FileListHdr" &gt;Number of Files Selected for Download:&lt;/span&gt;
                  &amp;nbsp;
                  &lt;asp:label ID="lblTotalFiles" Cssclass="FileListHdr" runat="server" &gt;&lt;/asp:label&gt;
                  &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;
                  &lt;span class="FileListHdr" &gt;Total MBytes:&lt;/span&gt;
                  &amp;nbsp;
                  &lt;asp:label ID="lblTotalMBytes" Cssclass="FileListHdr" runat="server" &gt;&lt;/asp:label&gt;
                  &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;
                  &lt;span class="FileListHdr" &gt;Estmated Download Time:&lt;/span&gt;
                  &amp;nbsp;
                  &lt;asp:label ID="lblEstimatedTime" Cssclass="FileListHdr" runat="server" &gt;&lt;/asp:label&gt;
                  &lt;asp:Button id="btnCompleteHidden" runat="server" Text="CH" Style="visibility: hidden"
                      Enabled="true" OnClick="btnCompleteHidden_OnClick"&gt;&lt;/asp:Button&gt;
              &lt;/div&gt; 
          &lt;/div&gt;
          &lt;div class="NinetyNinePercentWide"&gt;
              &lt;div class="OneHundredPercentWide"&gt;
                  &lt;div class="DivDownload" &gt;
                      &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;
                      &lt;script type="text/javascript"&gt;
                          //Create JavaScript object that will embed File Downloader to the page
                          var fd = new FileDownloaderWriter("FileDownloader", 170, 28);
  
                          //For ActiveX control full path to CAB file (including file name) should be specified
                          fd.activeXControlCodeBase = "aurigma/FileDownloader2.cab";
                          fd.activeXControlVersion = "2,0,16,0";
  
                          //Set the Download button text
                          fd.addParam("ButtonDownloadText", "DOWNLOAD NOW");
  
                          //Set the Download button background color
                          //fd.addParam("BackgroundColor", "#E0EBFF");
                          fd.addParam("BackgroundColor", "White");
  
                          //Set the Download button regular image
                          fd.addParam("ButtonDownloadImageFormat", "width=170;height=28;BackgroundColor=White;" + 
                              "urlNormal=App_Themes/Default/images/BtnDownload.jpg;" +
                              "urlHover=App_Themes/Default/images/BtnHover.jpg;" +
                              "urlPressed=App_Themes/Default/images/BtnPressed.jpg;" +
                              "urlDisabled=App_Themes/Default/images/BtnPressed.jpg");
  
                          //Set license key 
                          fd.addParam("LicenseKey", "73020-10000-D8066-8CFDB-84249");
  
                          //Set reconnect attampts count
                          fd.addParam("ReconnectAttemptsCount", "360");
  
                          //Set reconnect timeout value (30000 = 10 seconds)
                          fd.addParam("ReconnectTimeOut", "10000");
  
                          //The following listener will perform some actions when the file list is about to be downloaded
                          fd.addEventListener("DownloadStep", "FileDownloader_DownloadStep");
  
                          //The following listener will perform some actions when download of a single file is finished
                          fd.addEventListener("DownloadItemComplete", "onDownloadItemComplete");
  
                          //The following listener will perform some actions when download process is complete
                          fd.addEventListener("DownloadComplete", "onDownloadComplete");
  
                          //The following listener will perform some actions when a general error is detected
                          //fd.addEventListener("Error", "onError");
  
                          //Add page load listener
                          //fd.fullPageLoadListenerName = "fullPageLoad";
  
                          //Set instructions property
                          fd.instructionsEnabled = true;
  
                          //Tell File Downloader writer object to generate all necessary HTML code to embed File Downloader into the page
                          fd.writeHtml();
                      &lt;/script&gt;
                   &lt;/div&gt; 
                   &lt;div class="FileListHdr"&gt;
                      &lt;asp:RadioButtonList id="rblMemberMachine" runat="server" Font-Bold="True" BackColor="White" ToolTip="Please select machine for downloading" 
                              CssClass="Radio FileListHdr" RepeatDirection="Horizontal" textAlign="right" BorderStyle="None"
                              AutoPostBack="True" OnSelectedIndexChanged="rblMemberMachine_SelectedIndexChanged" &gt;
                              &lt;asp:ListItem Text="Machine 1" Value="1" Selected="True"&gt;&lt;/asp:ListItem&gt;
                              &lt;asp:ListItem Text="Machine 2" Value="2"&gt;&lt;/asp:ListItem&gt;
                              &lt;asp:ListItem Text="Machine 3" Value="3"&gt;&lt;/asp:ListItem&gt;
                      &lt;/asp:RadioButtonList&gt;
                   &lt;/div&gt;
               &lt;/div&gt;
            &lt;/div&gt;
         &lt;/div&gt;
      &lt;div class="OneHundredPercentWide" &gt;
          &lt;asp:Panel ID="Panel1" runat="server" Width="100%" &gt;
              &lt;asp:GridView id="grvSessionOrderDownloads" runat="server" BorderWidth="2px" BorderStyle="Solid" BorderColor="#C0C0FF"
                  Font-Names="Arial" Font-Bold="True" Font-Size="8pt" GridLines="Horizontal" AutoGenerateColumns="False" 
                  HorizontalAlign="Left" ForeColor="Blue" CellPadding="2" AllowSorting="True" Width="100%"
                  OnRowDataBound="grvSessionOrderDownloads_OnRowDataBound" &gt;
  
                  &lt;HeaderStyle Font-Names="Arial" HorizontalAlign="Center" ForeColor="White" BackColor="#152EE5" 
                      CssClass="sessionOrderDownloadHeaders" Font-Size="Medium" /&gt;
                  &lt;RowStyle BackColor="White" ForeColor="#333333" /&gt;
                  &lt;AlternatingRowStyle BackColor="#A5B0FF" /&gt;
  
                  &lt;Columns&gt;
                      &lt;asp:BoundField Visible="False" DataField="SORD_ID" HeaderStyle-Width="0px" &gt;
                          &lt;HeaderStyle Width="0px" /&gt;
                      &lt;/asp:BoundField&gt;
                      &lt;asp:TemplateField HeaderStyle-Width="0px" &gt;
                          &lt;ItemTemplate&gt;
                              &lt;asp:CheckBox Visible="False" Enabled="false" ID="HiddenCheckBox" runat="server"
                                   Checked='&lt;%# Eval("SORD_SelectedForDownloadFlag") %&gt;' /&gt;
                          &lt;/ItemTemplate&gt;
                          &lt;HeaderStyle Width="0px" /&gt;
                      &lt;/asp:TemplateField&gt;
                      &lt;asp:TemplateField HeaderText="Select Files" HeaderStyle-ForeColor="White" &gt; 
                          &lt;ItemTemplate &gt;
                              &amp;nbsp;&amp;nbsp;&amp;nbsp;
                              &lt;asp:ImageButton id="btnSelectVideo" runat="server" CommandArgument='&lt;%# Eval("SORD_ID") %&gt;' 
                                   CommandName="CheckUncheckVideo" ImageUrl='&lt;%# GetCheckboxImage(Container.DataItem) %&gt;' 
                                   Enabled='&lt;%# Eval("SORD_EnableSelectionCheckBox") %&gt;'
                                   Visible='&lt;%# Eval("SORD_EnableSelectionCheckBox") %&gt;'/&gt;
                          &lt;/ItemTemplate&gt;
                          &lt;HeaderStyle Width="4%" /&gt;
                          &lt;ItemStyle VerticalAlign="Bottom" /&gt;
                      &lt;/asp:TemplateField&gt;
                      &lt;asp:BoundField DataField="SORD_OSTA_ID" ReadOnly="True" HeaderStyle-ForeColor="White"
                          HeaderText="Status"&gt;
                          &lt;HeaderStyle Width="6%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;
                      &lt;asp:BoundField DataField="SORD_Topic" ReadOnly="True" HeaderStyle-ForeColor="White"
                          HeaderText="General &lt;br /&gt; Topic" HtmlEncode="false" &gt;
                          &lt;HeaderStyle Width="15%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;
                      &lt;asp:BoundField DataField="SORD_Session" ReadOnly="True" HeaderStyle-ForeColor="White"
                          HeaderText="Session &lt;br /&gt; YYMMDD" HtmlEncode="false" DataFormatString="{0:00-00-00}" &gt;
                          &lt;HeaderStyle Width="6%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;
                      &lt;asp:BoundField DataField="SORD_FileExtension" ReadOnly="True" HeaderStyle-ForeColor="White"
                          HeaderText="File &lt;br /&gt; Type" HtmlEncode="false" &gt;
                          &lt;HeaderStyle Width="5%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;
                      &lt;asp:BoundField DataField="SORD_SessionTitle" ReadOnly="True" HeaderStyle-ForeColor="White"
                          HeaderText="Presentation's Video-Title &lt;br /&gt; &amp;nbsp;&amp;nbsp; (or) Support-File Name" HtmlEncode="false" &gt;
                          &lt;HeaderStyle Width="29%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;   
                      &lt;asp:BoundField DataField="SORD_VideoUnlockKey" ReadOnly="True" HeaderStyle-ForeColor="White" 
                          HeaderText="File Unlock &lt;br /&gt; Password" HtmlEncode="false" &gt;
                          &lt;HeaderStyle Width="15%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;  
                      &lt;asp:BoundField DataField="SORD_LastDownloadDate"  
                          ReadOnly="True" HeaderStyle-ForeColor="White" HeaderText="Last &lt;br /&gt; Download" htmlEncode="False"
                          DataFormatString="{0:d}" &gt;
                          &lt;HeaderStyle Width="10%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;   
                      &lt;asp:BoundField DataField="SORD_RemainingDownloads"  
                          ReadOnly="True" HeaderStyle-ForeColor="White" HeaderText="Remaining &lt;br /&gt; Downloads" htmlEncode="False" DataFormatString="{0:##0}" &gt;
                          &lt;HeaderStyle Width="10%" /&gt;
                          &lt;ItemStyle CssClass="sessionOrderDownloadItems" /&gt;
                      &lt;/asp:BoundField&gt;
                  &lt;/Columns&gt;
  
              &lt;/asp:GridView&gt;
          &lt;/asp:Panel&gt;
      &lt;/div&gt;
  &lt;/div&gt; 
  &lt;br /&gt;
  &amp;nbsp;&amp;nbsp;&amp;nbsp;
  &lt;asp:Label ID="Errormsg" runat="server" ForeColor="#CC0000"&gt;&lt;/asp:Label&gt;
  </code></pre>
  
  <p></p>