我正在寫一個程序,其中用戶有3個下拉框來輸入日期,月份和年份。在用戶選擇我連接它們的值並檢查有效時默認情況下,當頁面加載時,我需要爲每個放置框分配當前日期,月份和年份。然後我檢查日期的有效性並將值傳遞給數據庫。如何將值賦給DropBox文本propery?
我的問題是,當我在加載頁面時將值分配給DropBoxes的文本時,它們變爲永久的。即使索引被更改,傳遞給數據庫的值也是在頁面加載時分配給它們的值。
我不能真正明白我在做什麼錯:
這些都是我用過的代碼示例:
我填充它們使用如下因素代碼(當前日期值在頁面加載事件):
Dim CurYear As Integer = DatePart("yyyy", Now) Dim CurDate As Integer = DatePart("d", Now) Dim CurMonth As String = Format(Today.Date, "MMMM") Dim CurDate2 As Integer = DatePart("d", Now) Dim CurMonth2 As String = Format(Now, "MM") Dates.Text = CurDate Monthe.Text = CurMonth years.Text = CurYear Month2.Text = CurMonth2 Dates2.Text = CurDate2
比我早來的2個投寄箱所選擇的指數同步含有月份和日子的2位格式的數值,以形成適當的字符串的時間
Protected Sub Months_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles Months.SelectedIndexChanged
Month2.SelectedIndex = Months.SelectedIndex
TextBox3.Text = years.Text & "-" & Monthes.Text & "-" & Dates.Text
End Sub
Protected Sub Dates_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles Dates.SelectedIndexChanged
Dates2.SelectedIndex = Dates.SelectedIndex
TextBox3.Text = years.Text & "-" & Monthes.Text & "-" & Dates.Text
End Sub
的檢查這是前端ASP代碼:
<asp:DropDownList ID="Dates" runat="server" autopostback="true">
<asp:ListItem></asp:ListItem>
<asp:ListItem>1</asp:ListItem>
...
<asp:ListItem>26</asp:ListItem>
<asp:ListItem>27</asp:ListItem>
<asp:ListItem>28</asp:ListItem>
<asp:ListItem>29</asp:ListItem>
<asp:ListItem>30</asp:ListItem>
<asp:ListItem>31</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="Months" runat="server" autopostback="true" >
<asp:ListItem></asp:ListItem>
<asp:ListItem>January</asp:ListItem>
...
<asp:ListItem>November</asp:ListItem>
<asp:ListItem>December</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="years" runat="server" autopostback="true" >
<asp:ListItem></asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="Dates2" runat="server" AutoPostBack="True">
<asp:ListItem></asp:ListItem>
<asp:ListItem>01</asp:ListItem>
<asp:ListItem>02</asp:ListItem>
....
<asp:ListItem>29</asp:ListItem>
<asp:ListItem>30</asp:ListItem>
<asp:ListItem>31</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="Month2" runat="server" AutoPostBack="True">
<asp:ListItem></asp:ListItem>
<asp:ListItem>01</asp:ListItem>
....
<asp:ListItem>11</asp:ListItem>
<asp:ListItem>12</asp:ListItem>
</asp:DropDownList>
同樣,如果我在加載頁面時未將默認值分配給框,則它完美地工作。如果我這樣做,這些值是固定的沒有母校你選擇什麼
的comparevalidator:
<asp:UpdatePanel ID="UpdatePanel19" runat="server">
<ContentTemplate>
<asp:TextBox ID="TextBox3" ValidationGroup="CompareValidatorDateTest" runat="server"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Dates" EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger ControlID="Monthes" EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger ControlID="years" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
<asp:CompareValidator ID="CompareValidator3" Display="dynamic" ControlToValidate="TextBox3"
Type="Date" Operator="LessThanEqual" Text="Please enter a valid date" runat="server"
ValidationGroup="CompareValidatorDateTest"
使用** findstringexact **首先得到索引... – matzone 2013-05-12 06:24:28
whattringegexact是什麼?原諒我的無知。 – meks 2013-05-12 06:34:36
組合框中沒有這種方法嗎? – matzone 2013-05-12 06:43:42