Question

首先，我想让每个人都知道我使用的是aspx引擎而不是Razor引擎。

我在表单中有一个表。我的一个文本框包含像

这样的html标签

</br>Phone: </br> 814-888-9999 </br> Email: </br> aaa@gmail.com.

当我去构建它时，它给我一个错误，说

从客户端(QuestionAnswer="...ics Phone:<br/>814-888-9999<br...")检测到潜在危险的Request.Form值。

我尝试了验证请求=“false”，但它没有用。

对不起，我没有添加我的HTML代码供你查看到目前为止。如果需要的话，我正在向我提出一些可以编辑的问题。

 <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master"   Inherits="System.Web.Mvc.ViewPage<dynamic>" %>


<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
EditFreqQuestionsUser
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<script type="text/javascript">
$(document).ready(function () {
    $("#freqQuestionsUserUpdateButton").click(function () {
        $("#updateFreqQuestionsUser").submit();
    });
});
</script>
<h2>Edit Freq Questions User </h2>

<%Administrator.AdminProductionServices.FreqQuestionsUser freqQuestionsUser =   ViewBag.freqQuestionsUser != null ? ViewBag.freqQuestionsUser : new   Administrator.AdminProductionServices.FreqQuestionsUser(); %>
<%List<string> UserRoleList = Session["UserRoles"] != null ? (List<string>)Session["UserRoles"] : new List<string>(); %>
<form id="updateFreqQuestionsUser" action="<%=Url.Action("SaveFreqQuestionsUser","Prod")%>" method="post" onsubmit+>
<table> 
    <tr>
        <td colspan="3" class="tableHeader">Freq Questions User Details <input type ="hidden" value="<%=freqQuestionsUser.freqQuestionsUserId%>" name="freqQuestionsUserId"/> </td>
    </tr>
     <tr>
        <td colspan="2" class="label">Question Description:</td>
        <td class="content">
            <input type="text" maxlength="2000" name="QuestionDescription" value="  <%=freqQuestionsUser.questionDescription%>" />
        </td>
    </tr>
     <tr>
        <td colspan="2" class="label">QuestionAnswer:</td>
        <td class="content">
            <input type="text" maxlength="2000" name="QuestionAnswer" value="<%=freqQuestionsUser.questionAnswer%>" />
        </td>
    </tr>
    <tr>
        <td colspan="3" class="tableFooter">
                <br />
                <a id="freqQuestionsUserUpdateButton" href="#" class="regularButton">Save</a>
                <a href="javascript:history.back()" class="regularButton">Cancel</a>
        </td> 
    </tr>
    </table>
      </form>
</asp:Content>

Answer 1

在提交页面之前，您需要使用window.escape（...）

对文本框的值进行html编码

如果您需要服务器端的未转义文本，请使用HttpUtility.UrlDecode(...)方法。

非常快速的样本：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="SO.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script>
        function makeSafe() {
            document.getElementById('TextBox1').value = window.escape(document.getElementById('TextBox1').value);
        };

        function makeDangerous() {
            document.getElementById('TextBox1').value = window.unescape(document.getElementById('TextBox1').value);
        }
    </script>
</head>
<body>
    <form id="form1" runat="server" onsubmit="makeSafe();">
    <div>
        <asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Rows="10" ClientIDMode="Static"></asp:TextBox>
    </div>
    <asp:Button ID="Button1" runat="server" Text="Button" />
    </form>


     <script>
         makeDangerous();
    </script>
</body>
</html>

对您的代码进行以下更改：

<script type="text/javascript">
    $(document).ready(function () {
        makeDangerous();
        $("#freqQuestionsUserUpdateButton").click(function () {
            makeSafe();
            $("#updateFreqQuestionsUser").submit();
        });
    });

    // Adding an ID attribute to the inputs you want to validate is simplest
    // Better would be to use document.getElementsByTagName and filter the array on NAME
    // or use a JQUERY select....

    function makeSafe() {
        document.getElementById('QuestionAnswer').value = window.escape(document.getElementById('QuestionAnswer').value);
    };

    // In this case adding the HTML back to a textbox should be 'safe'
    // You should be very wary though when you use it as actual HTML
    // You MUST take steps to ensure the HTML is safe.
    function makeDangerous() {
        document.getElementById('QuestionAnswer').value = window.unescape(document.getElementById('QuestionAnswer').value);
    }
</script>

Answer 2

使用[ValidateInput]属性装饰您的控制器操作：

[ValidateInput(false)]
[HttpPost]
public ActionResult Foo(MyViewModel model)
{
    ...
}

Answer 3

客户端JavaScript：

function codificarTags() {
                   document.getElementById('txtDescripcion').value = document.getElementById('txtDescripcion').value.replace(/</g,'&lt;').replace(/>/g,'&gt;');
            };

<form id="form1" runat="server" onsubmit="codificarTags();">

服务器：

protected void Page_Load(object sender, EventArgs e)
    {
        txtDescripcion.Text = txtDescripcion.Text.Replace(@"&lt;", @"<").Replace(@"&gt;", @">");

Answer 4

在文本框中使用html不是一个好习惯，可能使用换行符（Environment.NewLine）或\ r \ n而不是br？ .NET Reference

示例（在C＃中）：

textBox1.Multiline = true;
textBox1.Text = "test" + Environment.NewLine + "test2";

Answer 5

我建议使用AjaxControlToolkit的HTML编辑器。我现在正在实施。如果你的文本框是多行的并且足够大以容纳HTML，那么为什么不把它推到HTML编辑器。您的用户也会更快乐。

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/HTMLEditor/HTMLEditor.aspx

Answer 6

我采取了一些不同的方法。我想在我的应用程序中广泛使用 html 文本框。我制作了一个用户控件，每次添加新控件时都会避免编辑 javascript。我的整个控件都非常自定义，但 html 处理的核心如下所示。

UserControl 标记有一些简单的 javascript 来转义和取消转义文本框。

<script type="text/javascript">

    function UnescapeControl(clientId) {
            $('#' + clientId).val(window.unescape($('#' + clientId).val()));
    }

    function EscapeAllControls() {
       var escapeControList = JSON.parse('<%= new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(EscapeControlList) %>');
       for (var i = 0; i < escapeControList.length; i++) 
           EscapeControl(escapeControList[i]);            
    }

    function EscapeControl(textClientId) {
       document.getElementById(textClientId).value = window.escape(document.getElementById(textClientId).value); 
    }
</script>

<asp:TextBox ID="Txt_SavableText" CssClass="form-control" Width="100%" runat="server" ></asp:TextBox>

背后的代码负责在回发前使用 RegisterOnSubmitStatement 对控件进行转义，并在回发后使用 RegisterStartupScript 对控件进行转义。

public partial class SavableTextBox : System.Web.UI.UserControl
{

    public List<string> EscapeControlList
    {
        get
        {
            if (Session["STB_EscapeControlList"] == null)
                Session["STB_EscapeControlList"] = new List<string>();
            
            return (List<string>)Session["STB_EscapeControlList"];
        }
        set { Session["STB_EscapeControlList"] = value; }
    }

    

    protected void Page_Load(object sender, EventArgs e)
    {
        if (EscapeHtmlOnPostback && !EscapeControlList.Contains(GetClientId()))
            EscapeControlList.Add(GetClientId());

        // When using a script manager, you should use ScriptManager instead of ClientScript.
        if (EscapeHtmlOnPostback)
            ScriptManager.RegisterStartupScript(this.Page, this.Page.GetType(), "UnescapeControl_" + GetClientId(), "UnescapeControl('" + GetClientId() + "');", true);

        // Ensure we have our escape script called before all post backs containing escapable controls.
        // This is like calling OnClientClick before everything.
        if (EscapeControlList != null && EscapeControlList.Count > 0)
            this.Page.ClientScript.RegisterOnSubmitStatement(this.GetType(), "SaveableTextBoxEscaper", "EscapeAllControls();");
        
    }


   public string Text
    {
        get
        {
            return Txt_SavableText.Text;
        }
        set
        {
            Txt_SavableText.Text = value;
        }
    }

    public string GetClientId()
    {
        return Txt_SavableText.ClientID;
    }
}

现在我们可以在设置 EscapeHtmlOnPostback="True" 时像这样在任何地方使用它。

<%@ Register TagPrefix="STB" TagName="SavableTextBox" Src="~/SavableTextBox.ascx" %>
<STB:SavableTextBox ID="Txt_HtmlTextBox" EscapeHtmlOnPostback="True" runat="server" />

注意，当我们在回传期间访问 Txt_HtmlTextBox.Text 时，它已经为我们转义了。

如何在asp.net的文本框中提交HTML标记？

6 个答案: