Question

FreeTextBox的问题 高手来

我的FreeTextBox的问题是获取不了触发按钮时的输入值 请问下有人遇到过这样的事吗？ 如何解决！ 都搞了好长时间了 昏啊 。。

Answer 1

一、使用方法

1.先把freetextbox.dll添加到项目中

2.把 - ftb.colorpicker.aspx
- ftb.imagegallery.aspx
- ftb.inserttable.aspx

从文件夹HelperScripts复制出来，放到外面与 - test.aspx (测试)同等级目录，
（不这么做，插入背景色，图片，表格就不好使）

3.把images文件夹放到test.aspx (测试)同等级目录下,来存放上传的图片.

4.在test.aspx 中,加图片的路径
<FTB:FreeTextBox id="FreeTextBox1" runat="server" Width="700" ButtonPath="\images\ftb\office2003\"/>

this.FreeTextBox1.Text 这个就是FTB中你输入的文本的内容，这是带HTML标记的

this.FreeTextBox1.HtmlStrippedText 这个是将HTML标记去掉的文本

5.写入数据库
在CSDN上看到朋友们说怎么把FreeTextBox内容写入数据库中
我做了一下.就是把所有产生的HTML代码都插入数据库的一个字段中
可以做一个新闻表
news
字段ID(自增) content addtime(getdate)
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
if (!IsPostBack)
{
SqlConnection myConn = new SqlConnection("server=(local)；database=mm；uid=sa；pwd=123")；
SqlCommand myCmd = new SqlCommand("select * from test where id=2",myConn)；
myConn.Open()；
SqlDataReader myDr；
myDr=myCmd.ExecuteReader()；
myDr.Read()；
Response.Write(myDr["content"].ToString())；
myDr.Close()；
myConn.Close()；
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
SqlConnection myConn = new SqlConnection("server=(local)；database=mm；uid=sa；pwd=123")；
SqlCommand myCmd = new SqlCommand("insert into test (content) values('"+FreeTextBox1.Text+"')",myConn)；
myConn.Open()；
myCmd.ExecuteNonQuery()；
myConn.Close()；
}

二、注意
1、在web.config中system.web节加入: <pages validateRequest="false"/>
否则会出现如下错误：

从客户端(Content="<FORM language=javas...")中检测到有潜在危险的 Request.Form 值。
说明: 请求验证过程检测到有潜在危险的客户端输入值，对请求的处理已经中止。该值可能指示危及应用程序安全的尝试，如跨站点的脚本攻击。通过在 Page 指令或 配置节中设置 validateRequest=false 可以禁用请求验证。但是，在这种情况下，强烈建议应用程序显式检查所有输入。

异常详细信息: System.Web.HttpRequestValidationException: 从客户端(Content="<FORM language=javas...")中检测到有潜在危险的 Request.Form 值。

2、如果你想对其他页面要进行从客户端(Content="<FORM language=javas...")中检测，你就麻烦一点，在调用freetextbox的页面上添加 validateRequest="false" ，如：
<%@ Page language="c#" validateRequest="false" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="bizflat.WebForm1" %>

三、实现机制
刚开始试用FTB2.0的时候，感觉FTB真的很神，居然可以在网页状态实现编辑过程的What you see is what you get。看完FTB的文档（其实也不是很多的东西，估计就是用个NDOC或者什么类似的工具生成的SDK文档）又仔细试做了几个程序，觉得FTB的实现思路不复杂，但十分巧妙。它通过FTB这个中间部件将客户端（浏览器）的程序（javascript代码）和后台程序（C#写的aspx等ASP.NET代码）紧密结合，从而实现了这种所见即所得的效果。

FTB的结构主要有三个命名空间组成：
FreeTextBoxControls，FreeTextBoxControls.Design和FreeTextBoxControls.Support。

使用得最多的是FreeTextBoxControls，基本上用到的界面部件都来自于这里，例如ToolBar上每个功能Button可以在这里找到映射，而每个Button又对应着javascrip中的一个函数功能。

例如：下划线这个功能，有个Underline的类（继承于ToolbarButton）实现，而这个类实际调用客户端的一段javascript代码FTB_Underline（在FreeTextBox-ToolbarItemsSrcipt.js中）。

function FTB_Underline(ftbName) {
FTB_Format(ftbName,'underline');

如果再深究下去，仔细跟踪下这段js的代码又可以它调用FTB_Format这段代码（在FreeTextBox-MainScript.js中）。

function FTB_Format(ftbName,commandName) {
editor = FTB_GetIFrame(ftbName);

if (FTB_IsHtmlMode(ftbName)) return;
editor.focus();
editor.document.execCommand(commandName,'',null);

}

它正是通过document的execCommand方法来实现效果的，查MSDN文挡可以发现它对应执行的正是Underline的命令参数。

execCommand可以执行的命令参数：

Command Identifiers
2D-Position
Allows absolutely positioned elements to be moved by dragging.

AbsolutePosition
Sets an element's position property to "absolute."

BackColor
Sets or retrieves the background color of the current selection.

BlockDirLTR
Not currently supported.

BlockDirRTL
Not currently supported.

Bold
Toggles the current selection between bold and nonbold.

BrowseMode
Not currently supported.

ClearAuthenticationCache
Clears all authentication credentials from the cache. Applies only to execCommand.

Copy
Copies the current selection to the clipboard.

CreateBookmark
Creates a bookmark anchor or retrieves the name of a bookmark anchor for the current selection or insertion point.

CreateLink
Inserts a hyperlink on the current selection, or displays a dialog box enabling the user to specify a URL to insert as a hyperlink on the current selection.

Cut
Copies the current selection to the clipboard and then deletes it.

Delete
Deletes the current selection.

DirLTR
Not currently supported.

DirRTL
Not currently supported.

EditMode
Not currently supported.

FontName
Sets or retrieves the font for the current selection.

FontSize
Sets or retrieves the font size for the current selection.

ForeColor
Sets or retrieves the foreground (text) color of the current selection.

FormatBlock
Sets the current block format tag.

Indent
Increases the indent of the selected text by one indentation increment.

InlineDirLTR
Not currently supported.

InlineDirRTL
Not currently supported.

InsertButton
Overwrites a button control on the text selection.

InsertFieldset
Overwrites a box on the text selection.

InsertHorizontalRule
Overwrites a horizontal line on the text selection.

InsertIFrame
Overwrites an inline frame on the text selection.

InsertImage
Overwrites an image on the text selection.

InsertInputButton
Overwrites a button control on the text selection.

InsertInputCheckbox
Overwrites a check box control on the text selection.

InsertInputFileUpload
Overwrites a file upload control on the text selection.

InsertInputHidden
Inserts a hidden control on the text selection.

InsertInputImage
Overwrites an image control on the text selection.

InsertInputPassword
Overwrites a password control on the text selection.

InsertInputRadio
Overwrites a radio control on the text selection.

InsertInputReset
Overwrites a reset control on the text selection.

InsertInputSubmit
Overwrites a submit control on the text selection.

InsertInputText
Overwrites a text control on the text selection.

InsertMarquee
Overwrites an empty marquee on the text selection.

InsertOrderedList
Toggles the text selection between an ordered list and a normal format block.

InsertParagraph
Overwrites a line break on the text selection.

InsertSelectDropdown
Overwrites a drop-down selection control on the text selection.

InsertSelectListbox
Overwrites a list box selection control on the text selection.

InsertTextArea
Overwrites a multiline text input control on the text selection.

InsertUnorderedList
Toggles the text selection between an ordered list and a normal format block.

Italic
Toggles the current selection between italic and nonitalic.

JustifyCenter
Centers the format block in which the current selection is located.

JustifyFull
Not currently supported.

JustifyLeft
Left-justifies the format block in which the current selection is located.

JustifyNone
Not currently supported.

JustifyRight
Right-justifies the format block in which the current selection is located.

LiveResize
Causes the MSHTML Editor to update an element's appearance continuously during a resizing or moving operation, rather than updating only at the completion of the move or resize.

MultipleSelection
Allows for the selection of more than one site selectable element at a time when the user holds down the SHIFT or CTRL keys.

Open
Not currently supported.

Outdent
Decreases by one increment the indentation of the format block in which the current selection is located.

OverWrite
Toggles the text-entry mode between insert and overwrite.

Paste
Overwrites the contents of the clipboard on the current selection.

PlayImage
Not currently supported.

Print
Opens the print dialog box so the user can print the current page.

Redo
Not currently supported.

Refresh
Refreshes the current document.

RemoveFormat
Removes the formatting tags from the current selection.

RemoveParaFormat
Not currently supported.

SaveAs
Saves the current Web page to a file.

SelectAll
Selects the entire document.

SizeToControl
Not currently supported.

SizeToControlHeight
Not currently supported.

SizeToControlWidth
Not currently supported.

Stop
Not currently supported.

StopImage
Not currently supported.

StrikeThrough
Not currently supported.

Subscript
Not currently supported.

Superscript
Not currently supported.

UnBookmark
Removes any bookmark from the current selection.

Underline
Toggles the current selection between underlined and not underlined.

Undo
Not currently supported.

Unlink
Removes any hyperlink from the current selection.

Unselect
Clears the current selection.

基本上每个命令参数都可以在FTB的FreeTextBoxControls中找到对应的实现类，如果觉得有些没有实现，自己参照已经实现的功能来增加也十分简单和方便。

FTB还提供了公开的接口，例如继承于ToolbarButton可以实现对应的工具按钮，继承于ToolbarDropDownList则实现下拉式选择（如选择字体那种），对应javascript的方法只须传递对应的方法名字符串给类即可，自己写的javascript可以放在js中，也可以放在 ScriptBlock的字符串参数里面，前者前端查看源码看不到，后者则将整个函数源码传回，一切都十分公开和方便。
这种思路是否也和ASP.NET的思路类似？
由于javascript可以被多种浏览器支持（估计有些小兼容问题，可以通过javascript来兼容），因此FTB可以在多种环境下正常工作。现在用的这个blog系统（.Text）也用了FTB，但版本是1.6.3.26037（汉化版），有兴趣可以在发表文章的地方查看网页源代码看看，就会发现好多的FTB_XXX的javascript函数。这些在2.0已经全部集中放到FreeTextBox-ToolbarItemsSrcipt.js和 FreeTextBox-MainScript.js中了，应该说这样比较归一些。

如果担心FTB的免费协议对商业用途有些影响的话，自己根据这个思路来开发一个适合自己产品用的所见即所得编辑器控件应该也不是难事。