在回发事件后保留文本框文本

我在页面中有3个文本框。其中一个文本框从用户处取得新的密码，根据用户输入的密码，标签显示密码强度消息。但是在显示消息之后通过标签，textBox文本被清除。有没有办法保留文本？我已经启用了文本框的自动回送，因为我需要为它使用Comparevalidator。下面是代码snippet-在回发事件后保留文本框文本

protected void NewPassEntered(object sender, EventArgs e) 
    { 
     if (txtPassword.Text.Length < 4) 
     { 
      lblPassStr.Visible = Visible; 
      lblPassStr.BackColor = System.Drawing.Color.OrangeRed; 
      lblPassStr.Text = "Password should have more than four characters"; 
      txtPassword.Text = ""; 
     } 
     else if ((txtPassword.Text.Length > 4) && (txtPassword.Text.Length < 6) && (txtPassword.Text.Contains("@"))) 
     { 
      lblPassStr.Visible = Visible; 
      lblPassStr.BackColor = System.Drawing.Color.Green; 
      lblPassStr.Text = "Password Strength:Medium"; 

     } 
     else if ((txtPassword.Text.Length > 4) && (txtPassword.Text.Length < 6)) 
     { 
      lblPassStr.Visible = Visible; 
      lblPassStr.BackColor = System.Drawing.Color.Yellow; 
      lblPassStr.Text = "Password Strength:Weak"; 
     } 
     else if ((txtPassword.Text.Length > 6) && (txtPassword.Text.Contains("@"))) 
     { 
      lblPassStr.Visible = Visible; 
      lblPassStr.BackColor = System.Drawing.Color.Blue; 
      lblPassStr.Text = "Password Strength:Strong"; 
     } 
    } 
}

有没有一种方法能够有效地检查多个特殊字符？

的ASPX代码看起来像这个 - ：

 <div style="width:400px; height:250px;border-color:GoldenRod ;border-style:solid;border-width:thin;padding:20px 50px 50px 20px; position:relative; margin:100px 100px; margin-left:344px"> 

<table border="0" align="center" cellpadding="0" cellspacing="0" width="350" > 
            <tr><td> <br /></td></tr> 
            <tr> 
             <td style="width:200px"> 
              <span class="labeltxt"> Old Password:  </span> 
              <br /></td></tr><tr> <td style="width:200px"> <asp:TextBox ID="txtoldpass" 
               runat="server" CssClass="text" TextMode="Password" Width="300px" 
              Height="25" ></asp:TextBox> 
               <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="*Enter the old password" ControlToValidate="txtoldpass" Text="*" ForeColor="Red" InitialValue=""> 

        </asp:RequiredFieldValidator><br /> 
             </td> 

             </tr> 
             <tr> 
             <td><br /></td> 
             </tr> 

             <tr> 
             <td style="width:200px"> 
              <span>New Password: </span> 
              <br /></td></tr><tr> 
              <td style="width:200px"> 
              <asp:TextBox ID="txtPassword" runat="server" TextMode="Password" CssClass="text" 
                Width="300px" Height="25" 
                ontextchanged="NewPassEntered"></asp:TextBox> 
            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" Font-Italic="true" ErrorMessage="**Enter the new password!" ControlToValidate="txtPassword" Text="**" ForeColor="Red" InitialValue=""> 

        </asp:RequiredFieldValidator> 
             <br /></td> 
            </tr> 
            <tr> 
            <td><br /> 
             <asp:Label ID="lblPassStr" runat="server" Text="Label" Visible="False"></asp:Label></td> 
            </tr> 

            <tr> 
             <td style="width:200px"> 
              <span>Confirm Password:</span> 
             <br /> </td></tr> 

             <tr> 
             <td style="width:200px"> <asp:TextBox ID="txtPassword1" runat="server" 
               TextMode="Password" CssClass="text" Width="300px" Height="25"></asp:TextBox> 
            <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="***Enter the new password again!" ControlToValidate="txtPassword1" Text="***" ForeColor="Red" InitialValue=""> 

        </asp:RequiredFieldValidator> 
              <asp:CompareValidator ID="CompareValidator1" runat="server" 
               ErrorMessage="Passwords do not Match!" ControlToCompare="txtPassword" 
               ControlToValidate="txtPassword1"></asp:CompareValidator> 
             <br /> </td> 
            </tr> 

            <tr> 
            <td><br /><br /></td> 
            </tr> 

            <tr> 
             <td> 

              <asp:Button runat="server" ID="btnLogin" Text="Save" Height="25px" 
               Width="76px" CssClass="btn" BackColor="Goldenrod" onclick="btnLogin_Click"></asp:Button><asp:HyperLink ID="HyperLink1" runat="server">Cancel</asp:HyperLink> 
             </td> 
            </tr> 
           </table> 
           </div> 
           <asp:ValidationSummary ID="ValidationSummary1" Font-Italic="true" font-size="Small" forecolor="Black" runat="server" />

来源

2014-01-17 rawatdeepesh

为什么不使用客户端JavaScript来检查/验证密码强度？ – StevieB

不要回发整个页面以设置密码强度标签。为此使用Javascript。这里有2个使用javascript的好处。 1）页面不会被回发（通过回传整个页面将被刷新，只是因为单个字段整个页面回发不是一个好的做法） 2）没有必要保持文本框的状态，因为没有回传。

来源

2014-01-17 08:25:37 user2017326

有关使用EnableViewState =false什么？

<asp:TextBox ID="txtoldpass" runat="server" EnableViewState ="False" CssClass="text" TextMode="Password" 
Width="300px" Height="25" ></asp:TextBox>

来源

2014-01-17 08:13:07 zey

在回发事件后保留文本框文本

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