HTML5“必需"asp:DropDownList上的属性 [英] HTML5 "required" attribute on asp:DropDownList

问题描述

假设我的页面上有这个DDL:

Let's say I have this DDL on my page:

<asp:DropDownList ID="senha" runat="server" required="required" CssClass="form-control">
    <asp:ListItem Value="" Text="empty" Selected="True"></asp:ListItem>
    <asp:ListItem Value="1" Text="test1"></asp:ListItem>
    <asp:ListItem Value="2" Text="test2"></asp:ListItem>
</asp:DropDownList>

在此示例中，必填字段将毫无问题地工作，如果您不选择一个值，则它将阻止提交.
但是，如果初始值为0，该怎么办?

In this one, the required field will work without problem, if you don't select a value, then it will block the submit.
But what if the initial value is 0?

<asp:DropDownList ID="senha" runat="server" required="required" CssClass="form-control">
    <asp:ListItem Value="0" Text="empty" Selected="True"></asp:ListItem>
    <asp:ListItem Value="1" Text="test1"></asp:ListItem>
    <asp:ListItem Value="2" Text="test2"></asp:ListItem>
</asp:DropDownList>

现在必需"属性不再起作用.
我想做的是在值中放置一个模式，以仅接受大于零的值，但是我对RegExp并不熟悉，我也不知道HTML模式"属性是否可以满足我的要求.
有人可以启发我吗?
我宁愿使用纯HTML的解决方案，但如果只需要最少的编程，那我就别无选择...

Now the "required" attribute doesn't work anymore.
What I want to do is put a pattern in the value to only accept values greater than zero, but I'm not familiar with RegExp, and I don't know if the HTML "pattern" attribute will do what I want.
Can someone enlighten me?
I would rather use a solution that uses pure HTML, but if a minimal programming is required, then I don't have choice...

推荐答案

如果您只想编写，请标记

If you just want to write mark up the RequiredFieldValidator should work

<asp:DropDownList ID="senha" runat="server" required="required" CssClass="form-control">
    <asp:ListItem Value="0" Text="empty" Selected="True"></asp:ListItem>
    <asp:ListItem Value="1" Text="test1"></asp:ListItem>
    <asp:ListItem Value="2" Text="test2"></asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="reqSenha" runat="server" SetFocusOnError="true"  InitialValue="0" ErrorMessage="*" ControlToValidate="senha" />

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