vb.net “更新/取消”按钮不会出现在 TemplateField 编辑按钮中
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"Update/Cancel" buttons don't appear in TemplateField Edit button
提问by phalanx
When you create an edit button in every row of a Gridview using CommandFieldit displays update/cancel buttons after clicking, so you can accept/cancel changes.
However, I want an edit button that has tooltip text, and since CommandFielddoesn't have tooltip property, i used TemplateField. It worked with the delete button, but I'm having problems with the edit button:
当您在 Gridview 的每一行中创建一个编辑按钮时，CommandField它会在单击后显示更新/取消按钮，因此您可以接受/取消更改。但是，我想要一个带有工具提示文本的编辑按钮，并且由于CommandField没有工具提示属性，所以我使用了TemplateField. 它与删除按钮一起工作，但我在编辑按钮上遇到了问题：
<asp:GridView ID="GridView1" runat="server"
AllowPaging="True" AllowSorting="True"
DataMember="DefaultView"
DataSourceID="SqlDataSource1" AutoGenerateColumns="False"
DataKeyNames=FIELD,FIELD,FIELD" CellPadding="4" ForeColor="#333333" Width="90%"
Height="90%" Font-Size="Small">
<RowStyle BackColor="#EFF3FB" />
<Columns>
<asp:BoundField DataField="FIELD" HeaderText="FIELD" ReadOnly="True"
SortExpression="FIELD" />
<asp:BoundField DataField="FIELD" HeaderText="FIELD"
SortExpression="FIELD" />
<asp:BoundField DataField="FIELD" HeaderText="FIELD"
SortExpression="FIELD" />
<asp:BoundField DataField="FIELD" HeaderText="FIELD" ReadOnly="True"
SortExpression="FIELD" />
<asp:BoundField DataField="FIELD" HeaderText="FIELD" ReadOnly="True"
SortExpression="FIELD" />
<asp:BoundField DataField="FIELD" HeaderText="FIELD"
SortExpression="FIELD" />
<asp:CommandField ButtonType="Image" Visible="true" EditText="Edit" ShowEditButton="True" EditImageUrl="images/pencil1.png"></asp:CommandField>
<asp:TemplateField >
<ItemTemplate>
<asp:ImageButton ID="deleteButton" runat="server" CommandName="Delete" Text="Delete"
OnClientClick="return confirm('?Are you sure?');" ToolTip="delete" ImageUrl="images/DeleteRed1.png" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<EditRowStyle BackColor="#2461BF" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:DBUserInterfaceConnectionString %>"
SelectCommand="SELECT ... FROM ... INNER JOIN ... ON ..."
DeleteCommand="DELETE FROM ... WHERE ...=@param;"
UpdateCommand="UPDATE ... SET ... = @param, ... = @param2 WHERE ... = @param3 and ... = @param4 and ... = @param5;"
>
</asp:SqlDataSource>
As I said before, I replaced CommandFieldwith:
正如我之前所说，我替换CommandField为：
<asp:TemplateField >
<ItemTemplate>
<asp:ImageButton ID="editButton" runat="server" CommandName="Edit" Text="Edit" ToolTip="Edit" ImageUrl="images/pincel1.png" />
</ItemTemplate>
</asp:TemplateField >
but "Update/Cancel" buttons don't appear, so I can't update/edit anything. Why does it happen?
但是“更新/取消”按钮没有出现，所以我不能更新/编辑任何东西。为什么会发生？
Any Ideas to implement a succesful edit button?
实现成功编辑按钮的任何想法？
NOTES:
笔记：
Both buttons don't have vb code behind, for some reason delete button works just with
DeleteCommandin theSqlDataSource, and if I try to delete the command, it prompts error because no DeleteCommand is specified.UpdateCommandhas no purpose, it can be deleted. I could use it for a update button instead of an edit button, but when i tried, it says@paramsare not known, that's why I decided to use edit button instead.
两个按钮都没有后面的 vb 代码，出于某种原因，删除按钮只能
DeleteCommand在 中使用SqlDataSource，如果我尝试删除该命令，它会提示错误，因为没有指定 DeleteCommand。UpdateCommand没有目的，可以删除。我可以将它用作更新按钮而不是编辑按钮，但是当我尝试时，它说@params未知，这就是我决定使用编辑按钮的原因。
回答by R.C
The <asp:TemplateField>is used when you want to set your own-defined i.e. User-Defined content for each item in the GridView control.
在<asp:TemplateField>当你想设置自己的定义，即用户定义的内容在GridView控件每个项目使用。
The <asp:CommandField>is used when you want to use pre-defined command buttons to perform select, edit, or delete operations. Check MSDN here.
在<asp:CommandField>当你要使用预先定义的命令按钮进行选择，编辑或删除操作时使用。在此处查看MSDN。
So, when your are using your own user-defined way for edit button, you also need to specify your custom content way for Update & Cancel button inside <EditItemTemplate>as :
因此，当您使用自己的用户定义方式编辑按钮时，您还需要为内部的更新和取消按钮指定自定义内容方式<EditItemTemplate>：
<asp:TemplateField >
<ItemTemplate>
<asp:ImageButton ID="editButton" runat="server" CommandName="Edit" Text="Edit"
ToolTip="Edit" ImageUrl="images/pincel1.png" />
</ItemTemplate>
<EditItemTemplate>
<asp:ImageButton ID="BtnUpdate" runat="server" CommandName="Update" Text="Update"
OnClick="BtnUpdate_Click" ImageUrl="images/Update.png"/>
<asp:ImageButton ID="BtnCancel" runat="server" CommandName="Cancel" Text="Cancel"
OnClick="BtnCancel_Click" ImageUrl="images/Cancel.png"/>
</EditItemTemplate>
</asp:TemplateField >
And just make sure, Only if you are again providing your Custom Implementation for Update & Cancel logic,you also define the onclick events for these two Update and Cancel buttons. Else remove the OnClickfrom markup of these buttons.
[ BtnUpdate_Click& BtnCancel_Clickhere.]
并确保，仅当您再次为更新和取消逻辑提供自定义实现时，您还需要为这两个更新和取消按钮定义 onclick 事件。否则删除OnClick这些按钮的from 标记。[ BtnUpdate_Click&BtnCancel_Click这里。]
回答by Garrison Neely
I think since you've converted it to a TemplateField, all of the automatically-functioning stuff (like Update/Cancel buttons) has been disabled. I'm betting you'll need to add an <EditItemTemplate>with the Update and Cancel buttons, and hook them to the relevant commands using CommandName.
我认为自从您将其转换为 TemplateField 后，所有自动运行的东西（如更新/取消按钮）都已被禁用。我敢打赌，您需要添加<EditItemTemplate>带有更新和取消按钮的 ，并使用 将它们连接到相关命令CommandName。
