[英]Getting value from textarea in ASP.NET repeater?
我有一個asp.net轉發器控件,顯示來自sql db的數據。 我在每條記錄旁邊都顯示有刪除,編輯和保存按鈕,有點像管理員。
單擊edit
,隱藏的文本框將代替顯示數據的文字出現。 單擊“ save
,新值應保存到db中(它們是),並且文字將顯示新值。
但是新值字符串將作為空字符串返回。 它們不為null,但字符串不包含任何字符!
當我有兩個TextBox
時,這很好用,但是當我將一個切換到HTMLTextArea
,發生了這種情況!
這是我的相關代碼...
if (e.CommandName == "edit")
{
((TextBox)e.Item.FindControl("Onebox")).Visible = true;
((TextBox)e.Item.FindControl("Onebox")).Text = ((Literal)e.Item.FindControl("onelit")).Text;
((HtmlTextArea)e.Item.FindControl("Threebox")).Visible = true;
((HtmlTextArea)e.Item.FindControl("Threebox")).Value = ((Literal)e.Item.FindControl("threelit")).Text;
DataTable dt = new DataTable();
DataTable dt2 = new DataTable();
((Literal)e.Item.FindControl("onelit")).Visible = false;
((Literal)e.Item.FindControl("threelit")).Visible = false;
((LinkButton)e.Item.FindControl("LinkButton2")).Visible = false;
((LinkButton)e.Item.FindControl("LinkButton3")).Visible = true;
}
if (e.CommandName == "save")
{
string newoneval = ((TextBox)e.Item.FindControl("Onebox")).Text;
string newtwoval = ((HtmlTextArea)e.Item.FindControl("Threebox")).Value;
((TextBox)e.Item.FindControl("Onebox")).Visible = false;
((Literal)e.Item.FindControl("onelit")).Text = ((TextBox)e.Item.FindControl("Onebox")).Text;
((HtmlTextArea)e.Item.FindControl("Threebox")).Visible = false;
((Literal)e.Item.FindControl("threelit")).Text = ((HtmlTextArea)e.Item.FindControl("Threebox")).Value;
((Literal)e.Item.FindControl("onelit")).Visible = true;
((Literal)e.Item.FindControl("threelit")).Visible = true;
((LinkButton)e.Item.FindControl("LinkButton2")).Visible = true;
((LinkButton)e.Item.FindControl("LinkButton3")).Visible = false;
if(newoneval != null && newtwoval != null)
{
SqlDataReader dataReader;
String editstr = "update news set title = '" + newoneval + "', short_desc ='" + newtwoval + "' where pk_ID = @pk_ID";
SqlCommand command = new SqlCommand(editstr, conn);
command.Parameters.AddWithValue("@pk_ID", e.CommandArgument);
try
{
conn.Open();
dataReader = command.ExecuteReader();
dataReader.Close();
command.Dispose();
conn.Close();
BindRepeater();
}
catch (Exception exc)
{
Response.Write(exc);
}
}
else
{
Response.Write("No value");
}
這是ASP中繼器模板...
<asp:Repeater ID="list_holder" runat="server" OnItemCommand="runCommands">
<ItemTemplate>
<table>
<tr>
<!-- FIRST BOX CONTROLS ---------------->
<td class="cells">
<asp:Textbox id="Onebox"
text=''
runat="server"
enabled="true"
visible="false">
</asp:Textbox>
<asp:Literal id="onelit"
runat="server"
text='<%# DataBinder.Eval(Container.DataItem ,"title") %>'
/>
</td>
<td class="cells">
<textarea id="Threebox"
text=''
runat="server"
enabled="true"
Visible="false">
</textarea>
<asp:Literal id="threelit"
text='<%# DataBinder.Eval(Container.DataItem ,"short_desc") %>'
runat="server"
/>
</td>
<!-------------------------------------->
<!---- Link Buttons ------------------------>
<td class="cells">
<asp:LinkButton ID="LinkButton1"
runat="server"
CommandName="delete"
OnClientClick='javascript:return confirm("Are you sure you want to delete?")'
CommandArgument='<%# DataBinder.Eval(Container.DataItem, "pk_ID") %>'
CausesValidation="false">Delete</asp:LinkButton>
</td>
<td class="cells">
<asp:LinkButton ID="LinkButton2"
runat="server"
CommandName="edit"
CommandArgument='<%# DataBinder.Eval(Container.DataItem, "pk_ID") %>'
CausesValidation="false"
Visible ="true">Edit</asp:LinkButton>
<asp:LinkButton ID="LinkButton3"
runat="server"
CommandName="save"
CommandArgument='<%# DataBinder.Eval(Container.DataItem, "pk_ID") %>'
CausesValidation="false"
Visible ="false">Save</asp:LinkButton>
</td>
<!-------------------------------------------------->
</tr>
</table>
</ItemTemplate>
</asp:Repeater>
為什么在正確返回之前,這兩個字符串都返回空?
在ASP.NET中,當將visible設置為false時,Control不在頁面上呈現。
有關更多信息, 請參見MSDN 。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.