我有两个按钮控制。我点击btnavail_Click时要禁用文本框的字段验证程序。它的工作。但是当我单击按钮btnsubmit_Click时，字段验证器未启用。
protected void btnsubmit_Click(object sender, EventArgs e)
{
RequiredFieldValidator2.Enabled = true;
RequiredFieldValidator3.Enabled = true;
RequiredFieldValidator4.Enabled = true;
con.Open();
SqlCommand cmd1 = new SqlCommand("Select * from tblstudentinfo where StudentId=@studentid", con);
cmd1.Parameters.AddWithValue("@studentid",txtstudentid.Text.ToString());
SqlDataReader rdr=cmd1.ExecuteReader();
if(rdr.Read())
{
int i=Convert.ToInt32(rdr["Password"]);
int j=Convert.ToInt32(txtpassword.Text);
if(i == j)
{
SqlCommand cmd2 = new SqlCommand("select * from tblbookinfo where Name=@bookname", con);
cmd2.Parameters.AddWithValue("@bookname", txtbookname.Text.ToString());
SqlDataReader rdr1 = cmd2.ExecuteReader();
if (rdr1.Read())
{
int s = Convert.ToInt32(rdr1["BookId"]);
SqlCommand cmd = new SqlCommand("inserttotbllendinginfo2", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter
{
ParameterName = "@bookid",
SqlDbType = SqlDbType.Int,
Value = s
});
cmd.Parameters.Add(new SqlParameter
{
ParameterName = "@studentid",
SqlDbType = SqlDbType.Int,
Value = Convert.ToInt32(txtstudentid.Text)
});
cmd.Parameters.Add(new SqlParameter
{
ParameterName = "@noofbooks",
SqlDbType = SqlDbType.Int,
Value = Convert.ToInt32(txtnoofbook.Text)
});
cmd.Parameters.Add(new SqlParameter
{
ParameterName = "@dateoflending",
SqlDbType = SqlDbType.Date,
Value = txtdate.Text
});
cmd.ExecuteNonQuery();
}
}
else
{
lblpassword.Visible=true;
lblpassword.Text="Your password is incorrect. Please Check it";
lblpassword.ForeColor = System.Drawing.Color.Red;
}
con.Close();
}
}
protected void btnavail_Click(object sender, EventArgs e)
{
RequiredFieldValidator2.Enabled = false;
RequiredFieldValidator3.Enabled = false;
RequiredFieldValidator4.Enabled = false;
SqlCommand cmd = new SqlCommand("select * from tblbookinfo where Name=@bookname", con);
cmd.Parameters.AddWithValue("@bookname", txtbookname.Text.ToString());
con.Open();
if (String.IsNullOrEmpty(txtbookname.Text))
{
lblbookavail.Visible = true;
lblbookavail.Text = "Please enter a valid book name";
lblbookavail.ForeColor = System.Drawing.Color.Red;
}
else
{
SqlDataReader rdr = cmd.ExecuteReader();
if (rdr.Read())
{
string s = rdr["Name"].ToString();
if (s != null)
{
int i = Convert.ToInt32(rdr["AvailableBooks"]);
lblbookavail.Visible = true;
lblbookavail.Text = (i.ToString());
}
}
}
con.Close();
}
我将两个按钮的原因验证属性设置为false。我点击btnsubmit_Click时需要启用验证器。请有人帮助我。
<table align="center">
<tr><td>Book Name</td><td><asp:TextBox ID="txtbookname" runat="server"></asp:TextBox></td>
<td><asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Requires book name" ControlToValidate="txtbookname" ForeColor="Red" Text="*"></asp:RequiredFieldValidator></td>
<td><asp:Button ID="btnavail" runat="server" Text="Book Availability" OnClick="btnavail_Click" /></td><td><asp:Label ID="lblbookavail" runat="server" Visible="false"></asp:Label></td></tr>
<tr><td>Student Id</td><td><asp:TextBox ID="txtstudentid" runat="server" ValidationGroup="save"></asp:TextBox></td>
<td><asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Requires Studentid" ControlToValidate="txtstudentid" ForeColor="Red" Text="*"></asp:RequiredFieldValidator></td></tr>
<tr><td>No of Book</td><td><asp:TextBox ID="txtnoofbook" runat="server" ></asp:TextBox></td>
<td><asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="Requires no of book" ControlToValidate="txtnoofbook" ForeColor="Red" Text="*"></asp:RequiredFieldValidator></td></tr>
<tr><td>Date of lending</td><td><asp:TextBox ID="txtdate" runat="server" ></asp:TextBox></td></tr>
<tr><td>Password</td><td><asp:TextBox ID="txtpassword" TextMode="Password" runat="server" ></asp:TextBox></td>
<td><asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ErrorMessage="Requires Studentid" ControlToValidate="txtpassword" ForeColor="Red" Text="*"></asp:RequiredFieldValidator></td>
<td><asp:Label ID="lblpassword" runat="server" Visible="false"></asp:Label></td></tr>
<tr><td><asp:Button ID="btnsubmit" runat="server" Text="Submit" OnClick="btnsubmit_Click" /></td></tr>
</table>
这是我的HTML代码。我想在btnavail_click上为studentid禁用Field验证器，禁用书籍和密码。我需要再次为btnsubmit_click
启用它们答案 0 :(得分：1)
为什么不将ValidationGroup添加到您的文本框和按钮（btnsubmit）这样的内容
<asp:TextBox ID="TextBox1" runat="server" ValidationGroup="save"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ErrorMessage="RequiredFieldValidator" ControlToValidate="TextBox1"
ValidationGroup="save"></asp:RequiredFieldValidator>
<asp:TextBox ID="TextBox2" runat="server" ValidationGroup="save"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ErrorMessage="RequiredFieldValidator" ControlToValidate="TextBox2"
ValidationGroup="save"></asp:RequiredFieldValidator>
<asp:Button ID="btnAvail" runat="server" Text="Button" ValidationGroup="save"
onclick="btnAvail_Click" />
<asp:Button ID="btnsubmit" runat="server" Text="Button"
onclick="btnsubmit_Click" />
在这里，我给文本框提供了一个通用的验证组（我想在其上激活必要的字段验证）并提交按钮。因此，我的所有验证都只会在提交按钮上激活。
使用这种方法的好处是，您的所有工作都将在客户端完成，无需担心启用和禁用验证。
<强>更新 只需按原样使用此代码即可。
<table align="center">
<tr>
<td>
Book Name
</td>
<td>
<asp:TextBox ID="txtbookname" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="Requires book name"
ControlToValidate="txtbookname" ForeColor="Red" Text="*" ValidationGroup="avail"></asp:RequiredFieldValidator>
</td>
<td>
<asp:Button ID="Button1" runat="server" Text="Book Availability" OnClick="btnavail_Click" ValidationGroup="avail"/>
</td>
<td>
<asp:Label ID="lblbookavail" runat="server" Visible="false"></asp:Label>
</td>
</tr>
<tr>
<td>
Student Id
</td>
<td>
<asp:TextBox ID="txtstudentid" runat="server" ValidationGroup="save"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ErrorMessage="Requires Studentid"
ControlToValidate="txtstudentid" ForeColor="Red" Text="*" ValidationGroup="save"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
No of Book
</td>
<td>
<asp:TextBox ID="txtnoofbook" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server" ErrorMessage="Requires no of book"
ControlToValidate="txtnoofbook" ForeColor="Red" Text="*" ValidationGroup="save"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
Date of lending
</td>
<td>
<asp:TextBox ID="txtdate" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Password
</td>
<td>
<asp:TextBox ID="txtpassword" TextMode="Password" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server" ErrorMessage="Requires Studentid"
ControlToValidate="txtpassword" ForeColor="Red" Text="*" ValidationGroup="save"></asp:RequiredFieldValidator>
</td>
<td>
<asp:Label ID="lblpassword" runat="server" Visible="false"></asp:Label>
</td>
</tr>
<tr>
<td>
<asp:Button ID="Button2" runat="server" Text="Submit"
OnClick="btnsubmit_Click" ValidationGroup="save" style="height: 26px"/>
</td>
</tr>
</table>
答案 1 :(得分：0)
这是因为，您在服务器端代码中启用了RequiredFieldValidator，即按钮点击事件处理程序和RequiredFieldValidator等验证控件在客户端工作。这意味着当你点击Submit按钮时，由于你的验证器被禁用，它没有工作，表格被发布到服务器，现在即使你现在启用验证器，它也没用，因为表格已经发布。
而不是启用＆amp;要禁用验证程序控件，您应将每个按钮控件的CausesValidation属性设置为true或false，如下所示： -
<asp:Button ID="SubmitButton" runat="server" Text="Submit"
CausesValidation="true" OnClick="SubmitButton_Click" />
<强>更新
由于您不希望在btnavail按钮上进行验证，请为此按钮设置CausesValidation="false"，您的加价应如下所示： -
<asp:Button ID="btnavail" runat="server" Text="Book Availability"
CausesValidation="false" OnClick="btnavail_Click" />