如何禁用<select>标签（html下拉）使用asp.net下拉列表

标签在我选择dropdownlist后工作，我试图禁用其他下拉菜单。如何禁用<select>标签（html下拉）使用asp.net下拉列表

但问题是，只有在点击提交按钮时才会触发注意我的提交按钮还没有代码。

下面是我的一些代码

在Option.aspx（客户端）

<select id="ddlgames" class="ddlgame" runat="server"> 
    <option value="" selected="selected">Select One</option> 
    <option value="BasketBall">Basket Ball</option> 
    <option value="VolleyBall">Volley Ball</option> 
    <option value="FootBall">Foot Ball</option> 
</select> 

<asp:UpdatePanel ID="Update" runat="server"> 
    <ContentTemplate> 
     <asp:DropDownListID="ddlPlayer"CssClass="Player" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlPlayer_SelectedIndexChanged"> 
     </asp:DropDownList> 
     <asp:Label ID="lblcomment" runat="server" Text=""> 
     </asp:Label> 
    </ContentTemplate> 
</asp:UpdatePanel> 

<asp:Button ID="Submit" runat="server" OnClick="Submit_Click" Text="Submit" />

代码隐藏

protected void Page_Load(object sender, EventArgs e) 
{ 
    if (!IsPostBack) 
    { 
     ddlPlayer.Items.Add(new ListItem { Text = "Player", Value = "Y" }); 
     ddlPlayer.Items.Add(new ListItem { Text = "Non Player", Value = "N" }); 
    } 
} 

protected void ddlNameOfReport_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    if (ddlplayer.SelectedValue == "N") 
    { 
     ddlgames.Disabled = true; 
     lblcomment.Text = "Games option disabled"; 
    } 
    else 
    { 
     ddlgames.Disabled = true; 
     lblcomment.Text = "Games option enabled"; 
    } 
} 

protected void Submit_Click(object sender, EventArgs e) 
{ 
}

遗憾的错误语法:)

来源

2014-09-01 Awtszs

ddlNameOfReport我不能看到它在你的HTML希望它会ddlPlayer – Seminda 2014-09-01 03:18:01

为您的下拉菜单创建另一个UpdatePanel并添加AsyncPostBackTrigger。

<asp:UpdatePanel ID="Update2" runat="server"> 
    <ContentTemplate> 
<select id="ddlgames" class="ddlgame" runat="server"> 
    <option value="" selected="selected">Select One</option> 
    <option value="BasketBall">Basket Ball</option> 
    <option value="VolleyBall">Volley Ball</option> 
    <option value="FootBall">Foot Ball</option> 
</select> 
</ContentTemplate> 
<Triggers> 
<asp:AsyncPostBackTrigger ControlID="ddlNameOfReport" /> 
    </Triggers> 
</asp:UpdatePanel>

你ddlPlayer_SelectedIndexChanged必须有一个Update2.Update()

protected void ddlNameOfReport_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    if (ddlplayer.SelectedValue == "N") 
    { 
     ddlgames.Disabled = true; 
     lblcomment.Text = "Games option disabled"; 
    } 
    else 
    { 
     ddlgames.Disabled = true; 
     lblcomment.Text = "Games option enabled"; 
    } 
Update2.Update() 

}

来源

2014-09-29 09:31:18

原因是ddlPlayer下拉列表位于更新面板内。 ddlgame位于更新面板外部。

如果添加了更新面板内ddlgame下拉和改变ddlPlayer_SelectedIndexChanged事件这样

protected void ddlPlayer_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     var ddlplayer = (DropDownList)sender; 
     if (ddlplayer.SelectedValue == "N") 
     { 
      ddlgames.Disabled = true; 
      lblcomment.Text = "Games option disabled"; 
     } 
     else 
     { 
      ddlgames.Disabled = true; lblcomment.Text = "Games option enabled"; 
     } 
    }

或者，如果你想保住你的ddlgames出方此更新面板，那么你必须ddlgames添加到另一个更新面板并调用yourupdatepanel.Update（）;方法在ddlPlayer_SelectedIndexChanged事件中。

来源

2014-09-01 03:12:57 Seminda

如何禁用<select>标签（html下拉）使用asp.net下拉列表

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