0x800a138f - JavaScript运行时错误：无法获取未定义或空引用的属性“值” [英] 0x800a138f - JavaScript runtime error: Unable to get property 'value' of undefined or null reference

问题描述

我已经写了一个javascript代码来比较来自2个文本框的2dates
$ b $ pre $函数CompareDates（）{
var fdate = document.getElementById（'txtFromDate'）;
var edate = document.getElementById（'txtToDate'）;
var FromDate = fdate.value.split（'/'）;
var EndDate = edate.value.split（'/'）;
var val ='false';如果（parseInt（FromDate [2]）< parseInt（EndDate [2]））{
val ='true';

if
返回true; $ pa
$ b else if（parseInt（FromDate [2]）== parseInt（EndDate [2]））{
if（parseInt（FromDate [0]）< parseInt（EndDate [0 ]））{
val ='true';
返回true; $ pa
$ b else if（parseInt（FromDate [0]）== parseInt（EndDate [0]））{
if（parseInt（FromDate [1]）< = parseInt（EndDate [ 1]））{
val ='true';
返回true;


$ b if（val ==false）{
alert（FromDate Always Less To ToDate）;
返回false;


$ / code $ / pre
$ b $ 和html代码

 < asp：TextBox ID =txtFromDaterunat =serverWidth =150px/> 
  ID =ceFromDate
 TargetControlID =txtFromDate
 Format =dd / MM / yyyy /> 
< asp：TextBox ID =txtToDaterunat =serverwidth =150px/> 
< ajaxToolkit：CalendarExtender CssClass =MyCalendarrunat =server
 ID =ceToDAte
 TargetControlID =txtToDate
 Format =dd / MM / yyyy /> 
 
< asp：Button ID =btnGeneraterunat =serverCssClass =button
 Text =GenerateOnClientClick =if（！CompareDates（））return false;  
 OnClick =btnGenerate_Click/> 
  

问题在于页面在Chrome中运行良好，但是当我在IE中运行我的应用程序时，它抛出错误

0x800a138f - JavaScript运行时错误：无法获取未定义或空引用的属性'值'

请帮我解决这个问题。

解决方案

错误在这里：

  var fdate = document.getElementById（'txtFromDate'）; 
 var edate = document.getElementById（'txtToDate'）; 
  

问题在于 txtFromDate 和 txtToDate 是控件的服务器名称，而不是客户端名称（查看浏览器页面的源代码）。

试试这：

  var fdate = document.getElementById（'<％= txtFromDate.ClientID％>'）; 
 var edate = document.getElementById（'<％= txtToDate.ClientID％>'）; 
  

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.

解决方案

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%>');

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