DropDownList没有默认值 [英] DropDownList w/o default

问题描述

是否可以将DropDownList的选择留空？我们的应用程序

需要一些ddl'，它们保持空白而没有初始值，所以

我们可以为它们添加一个RequiredFieldValidator。


问候，

Michael

Hi,

is it possible to leave a DropDownList''s selection empty? Our application
requires for some ddl''s that they are kept blank w/o an initial value so
that we can add a RequiredFieldValidator to them.

Regards,
Michael

推荐答案

通常这是通过添加一个adtional条目来完成的一个文本，如

"（请选择一个值）"


Patrice


-


" Michael Groeger" <去********* @ web.de>一个écritdansle message de

新闻：Oj ************** @ TK2MSFTNGP15.phx.gbl ...

Generally this is done by adding an adtional entry with a text such as
"(Please select a value)"

Patrice

--

"Michael Groeger" <go*********@web.de> a écrit dans le message de
news:Oj**************@TK2MSFTNGP15.phx.gbl...

是否可以将DropDownList的选择留空？我们的应用程序需要一些ddl'，它们保持空白而没有初始值，所以我们可以为它们添加一个RequiredFieldValidator。

问候，

Hi,

is it possible to leave a DropDownList''s selection empty? Our application
requires for some ddl''s that they are kept blank w/o an initial value so
that we can add a RequiredFieldValidator to them.

Regards,
Michael

嗨迈克尔

尝试禁用并启用ur condation中的验证器可能是有效的

" Michael Groeger"写道：

hi Michael
try to disable and enable ur validator in ur condation may be it work
"Michael Groeger" wrote:

是否可以将DropDownList的选择留空？我们的应用程序需要一些ddl'，它们保持空白而没有初始值，所以我们可以为它们添加一个RequiredFieldValidator。

问候，

Hi,

is it possible to leave a DropDownList''s selection empty? Our application
requires for some ddl''s that they are kept blank w/o an initial value so
that we can add a RequiredFieldValidator to them.

Regards,
Michael

有些人，包括我自己，更喜欢在绑定的数据表上进行操作。


Eliyahu


" Patrice" <无**** @ nowhere.com>在消息中写道

news：uE ************** @ TK2MSFTNGP14.phx.gbl ...

Some people, including myself, prefer doing it on the bound datatable.

Eliyahu

"Patrice" <no****@nowhere.com> wrote in message
news:uE**************@TK2MSFTNGP14.phx.gbl...

一般来说这是通过添加带有文字的adtional条目，例如
（请选择一个值）

Patrice

-

Michael Groeger <去********* @ web.de> écritdansle message de
新闻：Oj ************** @ TK2MSFTNGP15.phx.gbl ...

Generally this is done by adding an adtional entry with a text such as
"(Please select a value)"

Patrice

--

"Michael Groeger" <go*********@web.de> a écrit dans le message de
news:Oj**************@TK2MSFTNGP15.phx.gbl...

是否可以将DropDownList的选择留空？我们的
应用程序需要一些ddl'，它们保持空白而没有初始值，所以我们可以为它们添加一个RequiredFieldValidator。

问候，
Michael

Hi,

is it possible to leave a DropDownList''s selection empty? Our application requires for some ddl''s that they are kept blank w/o an initial value so
that we can add a RequiredFieldValidator to them.

Regards,
Michael

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