[英]DropdownList validation with AutoPostBack set to true inside updatepanel
there are many posts that deal with validation controls inside update panel and partial page rendering. 有很多帖子涉及更新面板和部分页面渲染中的验证控件。 But i got a different problem here, i did try updating to sp1 .NET framework 2.0 and again .NET Framework 4.0 but nothing happens.
但是我在这里遇到了一个不同的问题,我确实尝试更新到sp1 .NET Framework 2.0,然后又更新到.NET Framework 4.0,但是什么也没有发生。
Basically i got a dropdownlist inside update panel whose autopostback is set to true and an empty item -- Select --
is added as index 0
for validation ( Required Field Validator
) purpose. 基本上我在更新面板中有一个dropdownlist,其autopostback设置为true,并且一个空项目
-- Select --
被添加为index 0
以进行验证( Required Field Validator
)。 I does happen that even when i select index 0 , the validation message appears briefly and then partial postback takes place . 我确实发生了即使我选择索引0时, 验证消息也会短暂出现然后发生部分回发的情况 。 Does anyone have any reasons for the same or alternate ways to do this.
是否有人有相同或替代方式的原因。
note: 注意:
I am populating other controls (dropdownlist) during the selected index changed event. 在选定的索引更改事件期间,我正在填充其他控件(下拉列表)。 I could use cascading dropdownlist from
AjaxControlToolkit
but then i lose event validation functionality that other controls need. 我可以使用
AjaxControlToolkit
级联下拉列表,但随后我失去了其他控件所需的事件验证功能。
why not validating client choise in code behind ? 为什么不验证后面代码中的客户选择?
for ex' : 对于前':
if (ddlName.selectedValue == "-1")
{
lblErr.text = "You have to select...";
lblErr.visible = true;
}
As a quick test I've come up with this, which works (for me): 作为一个快速测试,我想出了这个方法(对我而言):
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:RequiredFieldValidator ID="rfv" runat="server" ControlToValidate="ddl1" InitialValue="0" ValidationGroup="DDLOnly">*</asp:RequiredFieldValidator>
<asp:DropDownList ID="ddl1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="test" CausesValidation="true" ValidationGroup="DDLOnly">
<asp:ListItem Value="0">---Select---</asp:ListItem>
<asp:ListItem Value="1">Option1</asp:ListItem>
<asp:ListItem Value="2">Option2</asp:ListItem>
<asp:ListItem Value="3">Option3</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="ddl2" runat="server">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="rfvTxt" runat="server" ControlToValidate="txt1" ValidationGroup="WholePage">*</asp:RequiredFieldValidator>
<asp:TextBox ID="txt1" runat="server" ValidationGroup="WholePage"></asp:TextBox>
<asp:Button ID="btn1" runat="server" Text="Button" OnClientClick="return Page_ClientValidate();" OnClick="btn" />
</ContentTemplate>
</asp:UpdatePanel>
And in the code behind: 并在后面的代码中:
protected void test(object sender, EventArgs e)
{
ddl2.Items.Clear();
for (int i = 0; i < 4; i++)
ddl2.Items.Add(new ListItem("Test" + ddl1.SelectedIndex));
}
Populates the second DDL when any option is chosen, but not for the initial item of 0 选择任何选项时填充第二个DDL,但不填充初始项0
EDIT: Added in TextBox
and Button
with validation groups; 编辑:在
TextBox
和带有验证组的Button
添加; Only ddl1
is validated on SelectedIndexChanged
but both ddl1
and txt1
are validated OnClick
仅
ddl1
在SelectedIndexChanged
上经过验证,但ddl1
和txt1
均在OnClick
上经过验证
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