0x800a138f - JavaScript runtime error: Unable to get property 'value' of undefined or null reference
asp.net, html, javascript
Solution
The error is here:
var fdate = document.getElementById('txtFromDate');
var edate = document.getElementById('txtToDate');
The problem is that `txtFromDate` and `txtToDate` are the server name of controls, not the client name (look the source of page from the browser).
Try this:
var fdate = document.getElementById('<%=txtFromDate.ClientID%>');
var edate = document.getElementById('<%=txtToDate.ClientID%>');
Problem
i have written a javascript code to compare 2dates from 2 textboxes ``` function CompareDates() { var fdate = document.getElementById('txtFromDate'); var edate = document.getElementById('txtToDate'); var FromDate = fdate.value.split('/'); var EndDate = edate.value.split('/'); var val = 'false'; if (parseInt(FromDate[2]) < parseInt(EndDate[2])) { val = 'true'; return true; } else if (parseInt(FromDate[2]) == parseInt(EndDate[2])) { if (parseInt(FromDate[0]) < parseInt(EndDate[0])) { val = 'true'; return true; } else if (parseInt(FromDate[0]) == parseInt(EndDate[0])) { if (parseInt(FromDate[1]) <= parseInt(EndDate[1])) { val = 'true'; return true; } } } if (val == "false") { alert("FromDate Always Less Than ToDate"); return false; } } ``` and html code is ``` <asp:TextBox ID="txtFromDate" runat="server" Width="150px" /> <ajaxToolkit:CalendarExtender CssClass="MyCalendar" runat="server" ID="ceFromDate" TargetControlID="txtFromDate" Format="dd/MM/yyyy" /> <asp:TextBox ID="txtToDate" runat="server" Width="150px" /> <ajaxToolkit:CalendarExtender CssClass="MyCalendar" runat="server" ID="ceToDAte" TargetControlID="txtToDate" Format="dd/MM/yyyy" /> <asp:Button ID="btnGenerate" runat="server" CssClass="button" Text="Generate" OnClientClick="if(!CompareDates()) return false;" OnClick="btnGenerate_Click" /> ``` the problem is that the page is running well in chrome but when i run my application in IE it throw an error 0x800a138f - JavaScript runtime error: Unable to get property 'value' of undefined or null reference please help me to overcome from this problem.