DropDown List Validator [英] DropDown List Validator

问题描述

HI to All

这是我的HTML代码无法正常工作

当运行程序并点击插入显示消息请输入纪律

请帮助我。

 <   asp：TemplateField     HeaderText   = 纪律 >  
 <   EditItemTemplate  >  
 <   asp：DropDownList     ID   =  lstDiscipline    runat   =  server   文本  ='  < ％ #Bind（  Discipline） ％> ' >  
 <   asp：ListItem    文本  =  AR   值  =  AR >  <   / asp：ListItem  >  
 <   asp：ListItem    文字  =  PI   值  =  PI >  <   / asp：ListItem  >  
 <   asp：ListItem    文字  =  ST   值  =  ST >  <   / asp：ListItem  >  
 <   / asp ：DropDownList  >  
 <   asp：RequiredFieldValidator     ID   =   rfvDiscipline    ValidationGroup  < span class =code-keyword> = 更新    runat   =  server  
   
                           ControlToValidate   =  lstDiscipline    ErrorMessage   = 请输入纪律    InitialValue   =   -  1  
   
  < span class =code-attribute>                        工具提示  = 请输入纪律    SetFocusOnError   =  true    ForeColor   = 红色 >  * 
 <   / asp：RequiredFieldValidator  >  
 <   asp：RegularExpressionValidator     ID   =  reDiscipline    runat   =  server    ControlToValidate   =  lstDiscipline  
   
                           ErrorMessage   = 请输入纪律​​   工具提示  = 请输入纪律​​    InitialValue   =   -  1  
   
                    < span class =code-attribute>       SetFocusOnError   =  true    ForeColor   = 红色 < span class =code-attribute>   ValidationExpression   =  \ *    ValidationGroup   = 更新 >  * 
 <   / asp：RegularExpressionVa lidator  >  
 <   / EditItemTemplate  >  
 <   FooterTemplate  >  
 <   asp：DropDownList     ID   =  lstDiscipline    runat   =  server   >  
 <   asp：ListItem    文字  =  AR   值  =  AR >  <   / asp：ListItem  >  
 <   asp：ListItem    文字  = < span class =code-keyword> PI   值  =  PI >  <   / asp：ListItem  >  
 <   asp：ListItem    文本  =  ST   值  =  ST  >  <   / asp： ListItem  >  
 <   / asp：DropDownList  >  
 <   asp：RequiredFieldValidator     ID   =  rfvDiscipline    ValidationGroup   = 插入    runat   =  server  
   
                           ControlToValidate   =  lstDiscipline    ErrorMessage   = 请输入纪律​​    InitialValue   =   -  1  
   
                          工具提示  = < span class =code-keyword>请输入Discipline    SetFocusOnError   =  true    ForeColor   = 红色 >  * 
 <  < span class =code-leadattribute> / asp：RequiredFieldValidator  >  
 <   asp：RegularExpressionValidator     ID  < span class =code-keyword> =  reDiscipline    runat   =  server    ControlToVali日期  =  lstDiscipline  
   
                    < span class =code-attribute>       ErrorMessage   = 请输入纪律​​   工具提示  = 请输入纪律​​    InitialValue   =   -  1  
   
                           SetFocusOnError   =  true    ForeColor   = 红色    ValidationExpression   =  \ *    ValidationGroup   = 插入 >  * 
 <   / asp：RegularExpressionValidator  >  
 <   / FooterTemplate  >  
 <   ItemTemplate  >  
 <％ #Eval（  Discipline）％>  
 <   / ItemTe mplate  >  
 <   / asp：TemplateField  >  

解决方案

参见-1是关于下拉项索引的概念。

InitialValue概念：将检查所选项值是否与initialValue匹配所需的字段验证将会捕获。



为此您已经为每个下拉列表分配了一个选择项目

如下所示

 <   asp：DropDownList     ID   =  lstDiscipline    runat   =  server < span class = code-attribute>  >  
  <  < span class =code-leadattribute> asp：ListItem    文本  = 选择   值  =   -  1 > ;  <   / asp：ListItem  > ;   
 <   asp：ListItem    文字  =  AR   值  =  AR >   <   / asp：ListItem  >  
 <   asp：ListItem    文字  =  PI   值  =  PI < span class =code-keyword>>  <   / asp：ListItem  < span class =code-keyword>>  
 <   asp：ListItem    文本  =   ST   值  =  ST >  <   / asp：ListItem  >  
 <   / asp：DropDownList  >  
 <   asp：RequiredFieldValidator     ID   =  rfvDiscipline    ValidationGroup   = 插入    runat   =  server  
   
                       ControlToValidate   = < span class =code-keyword> lstDiscipline    ErrorMessage   = 请输入纪律    InitialValue   =   -  1  
   
                < span class =code-attribute>      工具提示  = 请输入纪律​​    SetFocusOnError   =  true    ForeColor   = 红色 >  * 
 <   / asp：RequiredFieldValidator  >  

HI to All
This is My HTML Code Bust Not Work Correctly
When Run Program And Click Insert show message Please Enter Discipline
Please Help Me.

<asp:TemplateField HeaderText="Discipline">
    <EditItemTemplate>
        <asp:DropDownList ID="lstDiscipline" runat="server" Text='<%# Bind("Discipline") %>'>
            <asp:ListItem Text="AR" Value="AR"></asp:ListItem>
            <asp:ListItem Text="PI" Value="PI"></asp:ListItem>
            <asp:ListItem Text="ST" Value="ST"></asp:ListItem>
        </asp:DropDownList>
        <asp:RequiredFieldValidator ID="rfvDiscipline" ValidationGroup="Update" runat="server"

            ControlToValidate="lstDiscipline" ErrorMessage="Please Enter Discipline" InitialValue="-1"

            ToolTip="Please Enter Discipline" SetFocusOnError="true" ForeColor="Red">*
        </asp:RequiredFieldValidator>
        <asp:RegularExpressionValidator ID="reDiscipline" runat="server" ControlToValidate="lstDiscipline"

            ErrorMessage="Please Enter Discipline" ToolTip="Please Enter Discipline" InitialValue="-1"

            SetFocusOnError="true" ForeColor="Red" ValidationExpression="\*" ValidationGroup="Update">*
        </asp:RegularExpressionValidator>
    </EditItemTemplate>
    <FooterTemplate>
        <asp:DropDownList ID="lstDiscipline" runat="server" >
            <asp:ListItem Text="AR" Value="AR"></asp:ListItem>
            <asp:ListItem Text="PI" Value="PI"></asp:ListItem>
            <asp:ListItem Text="ST" Value="ST"></asp:ListItem>
        </asp:DropDownList>
        <asp:RequiredFieldValidator ID="rfvDiscipline" ValidationGroup="Insert" runat="server"

            ControlToValidate="lstDiscipline" ErrorMessage="Please Enter Discipline" InitialValue="-1"

            ToolTip="Please Enter Discipline" SetFocusOnError="true" ForeColor="Red">*
        </asp:RequiredFieldValidator>
        <asp:RegularExpressionValidator ID="reDiscipline" runat="server" ControlToValidate="lstDiscipline"

            ErrorMessage="Please Enter Discipline" ToolTip="Please Enter Discipline" InitialValue="-1"

            SetFocusOnError="true" ForeColor="Red" ValidationExpression="\*" ValidationGroup="Insert">*
        </asp:RegularExpressionValidator>
    </FooterTemplate>
    <ItemTemplate>
        <%# Eval("Discipline")%>
    </ItemTemplate>
</asp:TemplateField>

解决方案

See -1 is a concept about dropdown item index.
InitialValue concept: will check the selected item value if it will match with initialValue the required field validation will catch.

For that you have assign one select item to each of dropdownlist
Like below

<asp:DropDownList ID="lstDiscipline" runat="server" >   
<asp:ListItem Text="Select" Value="-1"></asp:ListItem>        
  <asp:ListItem Text="AR" Value="AR"></asp:ListItem>
          <asp:ListItem Text="PI" Value="PI"></asp:ListItem>
          <asp:ListItem Text="ST" Value="ST"></asp:ListItem>
      </asp:DropDownList>
      <asp:RequiredFieldValidator ID="rfvDiscipline" ValidationGroup="Insert" runat="server"

          ControlToValidate="lstDiscipline" ErrorMessage="Please Enter Discipline" InitialValue="-1"

          ToolTip="Please Enter Discipline" SetFocusOnError="true" ForeColor="Red">*
      </asp:RequiredFieldValidator>

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