asp:textbox Uncaught TypeError: Cannot read property 'va
本文关键字：va property Cannot textbox Uncaught TypeError asp read | 更新日期: 2023-09-27 18:18:17
我得到这个错误，所以我的更新按钮不工作，我没有更新我的数据库进度，因为这个错误。我想让文本框可见我试着用。cs side
这个javascript代码使用复选框和文本框发送到cs端与json
function UpdateDetails1() {
var bEnabled = GetCheckBoxVal($("#<%=CB_Enabled_Edit.ClientID%>"));
var bDisplayDetails = GetCheckBoxVal($("#<%=CB_DisplayDetails_Edit.ClientID%>"));
var b3rdParty = GetCheckBoxVal($("#<%=CB_b3rdParty_Edit.ClientID%>"));
var bDisplayOpenNow = GetCheckBoxVal($("#<%=CB_DisplayOpenNow_Edit.ClientID%>"));
var bReservation = GetCheckBoxVal($("#<%=CB_Reservation_Edit.ClientID%>"));
var bPromotion = GetCheckBoxVal($("#<%=CB_Promotion_Edit.ClientID%>"));
var bOnlyPromotion = GetCheckBoxVal($("#<%=CB_OnlyPromotion_Edit.ClientID%>"));
var bAllowFollow = GetCheckBoxVal($("#<%=CB_AllowFollow_Edit.ClientID%>"));
var bAlacarte = GetCheckBoxVal($("#<%=CB_Alacarte_Edit.ClientID%>"));
var bDisplayOpenEat = GetCheckBoxVal($("#<%=CB_DisplayOpenEat_Edit.ClientID%>"));
var Coord_Lat = $("#<%=TB_Coord_Lat_Edit.ClientID%>")[0].value;
var Coord_Long = $("#<%=TB_Coord_Long_Edit.ClientID%>")[0].value;
var Price = $("#<%=TB_Price_Edit.ClientID%>")[0].value;
alert(Price);
var Phone_Number = $('#<%=TB_Phone_Number_Edit.ClientID%>')[0].value;
if (bReservation == true)
$("#display_res_schedule").css("display", "block");
else
$("#display_res_schedule").css("display", "none");
var jsonData = '{ bEnabled: "' + bEnabled + '",' +
'bDisplayDetails: "' + bDisplayDetails + '",' +
'b3rdParty: "' + b3rdParty + '",' +
'Price: "' + Price + '",' +
'bDisplayOpenNow: "' + bDisplayOpenNow + '",' +
'bReservation: "' + bReservation + '",' +
'bPromotion: "' + bPromotion + '",' +
'Phone_Number: "' + Phone_Number + '",' +
'bOnlyPromotion: "' + bOnlyPromotion + '",' +
'bAllowFollow: "' + bAllowFollow + '",' +
'bAlacarte: "' + bAlacarte + '",' +
'bDisplayOpenEat: "' + bDisplayOpenEat + '",' +
'Coord_Lat: "' + Coord_Lat + '",' +
'Coord_Long: "' + Coord_Long + '" }';
alert(jsonData);
// var jsonData = '{ bEnabled: "' + bEnabled + '",' +
// 'bDisplayOpenNow: "' + bDisplayOpenNow + '",' +
// 'bReservation: "' + bReservation + '",' +
// 'Coord_Lat: "' + Coord_Lat + '",' +
// 'Coord_Long: "' + Coord_Long + '" }';
$.ajax({
type: "POST",
url: "Edit.aspx/UpdateDetails1",
data: jsonData,
contentType: "application/json; charset=utf-8",
dataType: "json",
success: GetDetails1,
failure: function (response) {
alert(response.d);
}
});
}我需要做可见的假复选框和文本框，我不使用。但TB_Phone_Number_Edit。TypeError: Cannot read property 'value' of undefined error
protected void Page_Load(object sender, EventArgs e)
{
LoadType = Request.QueryString["t"].ToString();
if (LoadType == "Agency")
{
CB_DisplayOpenNow.Visible = false;
CB_DisplayOpenNow_Edit.Visible = false;
CB_Alacarte.Visible = false;
CB_Alacarte_Edit.Visible = false;
CB_DisplayOpenEat.Visible = false;
CB_DisplayOpenEat_Edit.Visible = false;
CB_Reservation.Visible = false;
CB_Reservation_Edit.Visible = false;
CB_Promotion.Visible = false;
CB_Promotion_Edit.Visible = false;
CB_OnlyPromotion.Visible = false;
CB_OnlyPromotion_Edit.Visible = false;
TB_Price_Edit.Visible = false;
DDL_Currency.Visible = false;
DDL_Camera.Visible = false;
CB_AllowFollow.Visible = false;
CB_AllowFollow_Edit.Visible = false;
WhatDoNow.Visible = false;
Alacarte.Visible = false;
WhatEatNow.Visible = false;
Promotion.Visible = false;
Reservation.Visible = false;
OnlyPromotion.Visible = false;
Price.Visible = false;
Camera.Visible = false;
AllowFollow.Visible = false;
Label23.Visible = false;
Label24.Visible = false;
Label25.Visible = false;
Label26.Visible = false;
Label27.Visible = false;
Label29.Visible = false;
Label30.Visible = false;
Label33.Visible = false;
Label34.Visible = false;
TB_Price_Edit.Visible = false;
}
else if(LoadType == "Tour"){
CB_b3rdParty.Visible = false;
CB_b3rdParty_Edit.Visible = false;
CB_Alacarte.Visible = false;
CB_Alacarte_Edit.Visible = false;
DDL_Camera.Visible = false;
CB_AllowFollow.Visible = false;
CB_AllowFollow_Edit.Visible = false;
CB_DisplayOpenEat.Visible = false;
CB_DisplayOpenEat_Edit.Visible = false;
b3rdParty.Visible = false;
Alacarte.Visible = false;
WhatEatNow.Visible = false;
Camera.Visible = false;
AllowFollow.Visible = false;
Label18.Visible = false;
Label24.Visible = false;
Label25.Visible = false;
Label33.Visible = false;
Label34.Visible = false;
Phone_Number.Visible = false;
TB_Phone_Number_Edit.Visible = false;
Label8.Enabled = false;
}
假设问题不在GetCheckBoxVal中，以下任何语句都会导致您的问题:
var Coord_Lat = $("#<%=TB_Coord_Lat_Edit.ClientID%>")[0].value;
var Coord_Long = $("#<%=TB_Coord_Long_Edit.ClientID%>")[0].value;
var Price = $("#<%=TB_Price_Edit.ClientID%>")[0].value;
var Phone_Number = $('#<%=TB_Phone_Number_Edit.ClientID%>')[0].value;
为什么?因为如果给jQuery的css选择器没有返回匹配，数组将有0个元素，也就是说，它的长度将为0。这意味着即使在元素[0]上没有任何内容，它的值也是未定义的。在未定义的值上尝试获取属性或调用方法会导致您看到的异常。
正如所建议的副本所建议的那样，你方应该防范这种情况。一种可能的方法是引入效用函数:// this gets the value property of an object and if object is undefined
// returns a default
function getValueOrDefault(someObject, reasonableDefault) {
return someObject === undefined ? reasonableDefault : someObject.value;
}
// your original function
function UpdateDetails1() {
// rest of your code
}
有了这个函数，你的代码变成:
var Coord_Lat = getValueOrDefault($("#<%=TB_Coord_Lat_Edit.ClientID%>")[0], '0.0');
var Coord_Long = getValueOrDefault($("#<%=TB_Coord_Long_Edit.ClientID%>")[0], '0.0');
var Price = getValueOrDefault($("#<%=TB_Price_Edit.ClientID%>")[0],0);
var Phone_Number = getValueOrDefault($('#<%=TB_Phone_Number_Edit.ClientID%>')[0],'+1 010');
将解决未捕获类型错误。这取决于你提出合理的默认值。
将文本框设置为Visible = false使其不在html中呈现。因此，当您尝试在javascript中获取值时，它实际上不存在，使其成为undefined。
要解决这个问题，要么用隐藏字段替换文本框，要么改变不透明度，使文本框在那里但透明