[英]DropDownList selected item keeps selecting the same item ASP.NET c#
我已經在ASP.NET中的Webform上創建了一個DropDownList。 在瀏覽器中,我想從下拉列表中選擇一個項目,並在標簽中顯示該項目的文本,但是無論我選擇哪個項目,下拉列表都會一直選擇相同的項目。
這是我的DropDownList;
<asp:DropDownList ID="ddlWeek" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlWeek_SelectedIndexChanged" Visible="False">
<asp:ListItem Value="1">Select a Week</asp:ListItem>
<asp:ListItem Value="10">June 7 to June 14, 2015</asp:ListItem>
<asp:ListItem Value="10">June 14 to June 21, 2015</asp:ListItem>
<asp:ListItem Value="10">June 21 to June 28, 2015</asp:ListItem>
<asp:ListItem Value="10">June 28 to July 5, 2015</asp:ListItem>
<asp:ListItem Value="10">July 5 to July 12, 2015</asp:ListItem>
<asp:ListItem Value="10">July 12 to July 19, 2015</asp:ListItem>
<asp:ListItem Value="10">July 19 to July 26, 2015</asp:ListItem>
<asp:ListItem Value="10">July 26 to August 2, 2015</asp:ListItem>
<asp:ListItem Value="10">August 2 to August 9, 2015</asp:ListItem>
<asp:ListItem Value="10">August 9 to August 16, 2015</asp:ListItem>
<asp:ListItem Value="10">August 16 to August 23, 2015</asp:ListItem>
<asp:ListItem Value="10">August 23 to August 30, 2015</asp:ListItem>
</asp:DropDownList>
這就是我想要做的:
protected void ddlWeek_SelectedIndexChanged(object sender, EventArgs e)
{
lbWeek.Text = "You selected the week of: " + ddlWeek.SelectedItem.Text;
}
使用自動回傳並將其設置為true。 任何幫助表示贊賞。 泥炭
您的下拉列表項值必須不同。 如果為所有項目提供相同的值,則在asp.net中將無法使用。
<asp:DropDownList ID="ddlWeek" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlWeek_SelectedIndexChanged">
<asp:ListItem Value="1">Select a Week</asp:ListItem>
<asp:ListItem Value="2:10">June 7 to June 14, 2015</asp:ListItem>
<asp:ListItem Value="3:10">June 14 to June 21, 2015</asp:ListItem>
<asp:ListItem Value="4:10">June 21 to June 28, 2015</asp:ListItem>
<asp:ListItem Value="5:10">June 28 to July 5, 2015</asp:ListItem>
<asp:ListItem Value="6:10">July 5 to July 12, 2015</asp:ListItem>
<asp:ListItem Value="7:10">July 12 to July 19, 2015</asp:ListItem>
<asp:ListItem Value="8:10">July 19 to July 26, 2015</asp:ListItem>
<asp:ListItem Value="9:10">July 26 to August 2, 2015</asp:ListItem>
<asp:ListItem Value="10:10">August 2 to August 9, 2015</asp:ListItem>
<asp:ListItem Value="11:10">August 9 to August 16, 2015</asp:ListItem>
<asp:ListItem Value="12:10">August 16 to August 23, 2015</asp:ListItem>
<asp:ListItem Value="13:10">August 23 to August 30, 2015</asp:ListItem>
</asp:DropDownList>
編輯:
我已經在上面的代碼中更改了DropDown控件的所有值,現在您可以按以下邏輯獲取DropDownList的選定值:
protected void ddlWeek_SelectedIndexChanged(object sender, EventArgs e)
{
lbWeek.Text = "You selected the week of: " + ddlWeek.SelectedItem.Text + "<br/>";
lbWeek.Text += "Value: " + ddlWeek.SelectedItem.Value + "<br/>";
int liStartIndex = ddlWeek.SelectedItem.Value.IndexOf(":") + 1;
int liLength = ddlWeek.SelectedItem.Value.Length - liStartIndex;
string lsOriginalValue = string.Empty;
if (liStartIndex > 1)
{
lsOriginalValue = ddlWeek.SelectedItem.Value.Substring(liStartIndex, liLength);
lbWeek.Text += "Original Value: " + lsOriginalValue;
}
}
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