html - FindElementByID referencing Null (called from Javascript) -
i have javascript code written in iframe, modifying value of hiddenfield in contentplaceholder in parent window, , firing click event of button, , setting visibility of iframe. referenced erroneously.
javascript in iframe:
<script type="text/javascript"> function changeview(obj) { parent.document.getelementbyid("hiddenfield1").value = $(obj).attr('id'); parent.document.getelementbyid("button1").click(); var iframe = parent.document.getelementbyid("newsframe"); iframe.style.display = "block"; } </script> </head> <body> <form id="f"> <nav> <ul id="nav"> <li><a id="ahome" href="#" onclick="changeview(this)" >home</a></li> <li><a href="#">about</a> <ul> <li><a id="amessage" href="#" onclick="changeview(this)">message</a></li> </ul> </li> </ul> </nav> </form> </body> parent page:
<asp:content id="content3" contentplaceholderid="contentplaceholder2" runat="server"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title> </title> <script runat="server"> sub changeview() dim t hiddenfield ' dim mc control = findcontrol("label1") t = findcontrol("hiddenfield1") dim m multiview m = findcontrol("multiview1") if (t.value = "ahome") m.activeviewindex = 0 end if if (t.value = "amessage") m.activeviewindex = 1 end if end sub </script> </head> <body> <form id="form1" runat="server"> <asp:button id="button1" runat="server" visible="true" onclick="changeview" /> <asp:scriptmanager id="sm1" runat="server" /> <asp:updatepanel id="updatepanel1" runat="server"> <contenttemplate> <asp:hiddenfield id="hiddenfield2" runat="server" /> <asp:multiview id="multiview2" runat="server" activeviewindex="0"> <asp:view id="view8" runat="server"> home </asp:view> <asp:view id="view9" runat="server"> department message </asp:view> </asp:multiview> <br /><br /> </contenttemplate> </asp:updatepanel> </form> </body> </html> <iframe src="dept-menu/index.html" width="100%" height="650px" scrolling="no" frameborder="0"></iframe> <iframe id="newsframe" src="dept-news/news.html" width="100%" height="300px" scrolling="no" frameborder="0"></iframe> </asp:content> html
<input type="submit" name="ctl00$contentplaceholder2$button1" value="" id="button1" /> <script type="text/javascript"> //<![cdata[ sys.webforms.pagerequestmanager._initialize('ctl00$contentplaceholder2$sm1', 'form1', ['tctl00$contentplaceholder2$updatepanel1','contentplaceholder2_updatepanel1'], [], [], 90, 'ctl00'); //]]> </script> <div id="contentplaceholder2_updatepanel1"> <input type="hidden" name="ctl00$contentplaceholder2$hiddenfield1" id="hiddenfield1" /> home <br /><br /> </div> at runtime error says can't set value of null reference. doing wrong? in advance.
p.s. iframe called contentplaceholder.
simply added
parent.document.getelementbyid("contentplaceholder2_hiddenfield1").value = $(obj).attr('id'); instead of
parent.document.getelementbyid("hiddenfield1").value = $(obj).attr('id'); 
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