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			[轉]   JScript 編寫HTML在線編緝器
		
    
		
    

    

    document.execCommand(command, false,
value);
    
    一、首先來看一個例子：
    
<DIV contenteditable="true" style="border:dashed blue 2px">Hello World!</DIV>
    

    
保存為html網頁，打開看看，在DIV里出現了一個光標，這個DIV就變成可以編輯的了。
    

    
類似的，SPAN，FONT等都可以有 contenteditable="true"  這個屬性。
    

    
再試試下面的：
    

    
    <DIV contenteditable="true" style="border:dashed blue 2px">Hello World!
    
        <IMG src="http://p.blog.csdn.net/images/p_blog_csdn_net/comstep/70786/o_logo.jpg" />
    
    </DIV>
    
我們就可以拉伸圖片了。
    
    

    二、具體實現：
    

        1、需要兩個頁面，blank.html editor.html
    

        2、blank.html 作為 editor.html的一個內嵌Frame，作為編輯框。
    

    

    

     2、blank.html
    
<html>
    
    <body topmargin="10" leftmargin="10" bgColor="#f6f6f6">
    
      <div id="RTC" contenteditable = true></div>
    
    </body>
    
    </html>
    

    
 3、editor.html 主要是一些Javascript，用來處理不同的命令 
    

    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    
    <HTML>
    
    <HEAD>
    
    <TITLE> New Document </TITLE>
    
    <META NAME="Generator" CONTENT="EditPlus">
    
    <META NAME="Author" CONTENT="">
    
    <META NAME="Keywords" CONTENT="">
    
    <META NAME="Description" CONTENT="">
    
    <SCRIPT LANGUAGE="JavaScript">
    
    <!--
    
    var contentHTML;
    
    function exeCommand(command, value)
    
{
    
  document.execCommand(command,     false, value);
    
}
    

    
    // 加粗
    
    function Black()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  exeCommand(    'Bold', '');
    
}
    

    
    // 斜體
    
    function Italic()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  exeCommand(    'Italic', '');
    
}
    

    
    // 下劃線
    
    function UnderLine()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  exeCommand(    'Underline', '');
    
}
    

    
    // 向里縮進
    
    function Indent()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  exeCommand(    'Indent', '');
    
}
    

    
    // 向外縮進
    
    function Outdent()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  exeCommand(    'Outdent', '');
    
}
    

    
    // 無序列表
    
    function UnorderList()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  exeCommand(    'InsertUnorderedList', '');
    
}
    

    
    // 有序列表
    
    function OrderList()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  exeCommand(    'InsertOrderedList', '');
    
}
    

    
    // 插入圖片
    
    function Image()
    
{
    
      var obj = frames['ifRTC'].RTC;
    
  obj.focus();
    
  ImagePath     = window.prompt('請輸入圖片路徑：', '');
    
  exeCommand(    'InsertImage', ImagePath);
    
}
    

    
    // 預覽效果
    
    function Preview()
    
{
    
      var htmlContent = frames['ifRTC'].RTC.innerHTML;
    
      var open = window.open('');
    
  open.document.write(htmlContent);
    
}
    

    
    // 查看編輯框里的HTML源代碼
    
    function Source()
    
{
    
      var htmlContent = frames['ifRTC'].RTC.innerHTML;
    
      if (document.all.iframeDiv.style.display == 'block')
    
  {
    
    document.all.iframeDiv.style.display     = 'none';
    
    document.all.htmlText.value     = htmlContent;
    
    document.all.textDiv.style.display     = 'block';
    
    document.all.htmlText.focus();
    
    document.all.Source.value    ='HTML';
    
  }
    
      else
    
  {
    
    document.all.iframeDiv.style.display     = 'block';
    
    document.all.textDiv.style.display     = 'none';
    
    frames[    'ifRTC'].RTC.innerHTML = document.all.htmlText.value;
    
    frames[    'ifRTC'].RTC.focus();
    
    document.all.Source.value    =' 源代碼 ';
    
  }
    
}
    

    
    // 增加編輯框的高度
    
    function Add()
    
{
    
  document.all.ifRTC.height     = document.all.ifRTC.height*1 + 50;
    
}
    
    //-->
    
    </SCRIPT>
    
    </HEAD>
    

    
    <BODY>
    
    <TABLE width="400"border="0">
    
    <TR>
    
     <TD><input type="button" value="B" name="Black" onclick="Black()" /></TD>
    
     <TD><input type="button" value="I" name="Italic" onclick="Italic()" /></TD>
    
     <TD><input type="button" value="U" name="UnderLine" onclick="UnderLine()" /></TD>
    
      <TD><input type="button" value="UL" name="UnorderList" onclick="UnorderList()" /></TD>
    
      <TD><input type="button" value="OL" name="OrderList" onclick="OrderList()" /></TD>
    
     <TD><input type="button" value="左" name="Outdent" onclick="Outdent()" /></TD>
    
     <TD><input type="button" value="右" name="Indent" onclick="Indent()" /></TD>
    
     <TD><input type="button" value="圖" name="Image" onclick="Image()" /></TD>
    
    </TR>
    
    </TABLE>
    
    <div id="iframeDiv" style="display:block">
    
    <iframe id="ifRTC" width="400" height="200" border="1" src="blank.html" ></iframe>
    
    </div>
    
    <div id="textDiv" style="display:none">
    
      <textarea id="htmlText" cols="50" rows="10"></textarea>
    
    </div>
    
    <br>
    
    <input type="button" value=" + " name="Add" onclick="Add()" />&nbsp;&nbsp;
    
    <input type="button" value=" 預  覽 " name="Preview" onclick="Preview()" />&nbsp;&nbsp;
    
    <input type="button" value=" 源代碼 " name="Source" onclick="Source()" />
    
    </BODY>
    
    </HTML>
    

    

    

    

    三、后記：
    

    

    這里寫的只是一個簡單的編輯器，其實重要的就是：
    

    contenteditable="true"
    

    和
    

    document.execCommand(command, false, value);
    

    關于 document 的一些方法，可以查看MS的文檔。
    

    execCommand 的一些命令也可以在文檔里找到，下面列出一些：
    

    

    execCommand(command, false, value); 中的 command
可以是以下這些：
    

    
    
        
    
            BackColor
            Sets or retrieves the background color of the
            current selection.
        
    
        
    
            Bold
            Toggles the current selection between bold and
            nonbold.
        
    
        
    
            ClearAutocompleteForForms
            Clears saved forms data.
        
    
        
    
            Copy
            Copies the current selection to the
            clipboard.
        
    
        
    
            CreateBookmark
            Retrieves the name of a bookmark anchor or creates a
            bookmark anchor for the current selection or insertion point.
        
    
        
    
            CreateLink
            Retrieves the URL of a hyperlink or creates a
            hyperlink on the current selection.
        
    
        
    
            Cut
            Copies the current selection to the clipboard and
            then deletes it.
        
    
        
    
            Delete
            Deletes the current selection.
        
    
        
    
            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 or retrieves the current block format
            tag.
        
    
        
    
            Indent
            Increases the indent of the selected text by one
            indentation increment.
        
    
        
    
            InsertButton
            Overwrites a button control on the current
            selection.
        
    
        
    
            InsertFieldset
            Overwrites a box on the current
            selection.
        
    
        
    
            InsertHorizontalRule
            Overwrites a horizontal line on the current
            selection.
        
    
        
    
            InsertIFrame
            Overwrites an inline frame on the current
            selection.
        
    
        
    
            InsertImage
            Overwrites an image on the current
            selection.
        
    
        
    
            InsertInputButton
            Overwrites a button control on the current
            selection.
        
    
        
    
            InsertInputCheckbox
            Overwrites a check box control on the current
            selection.
        
    
        
    
            InsertInputFileUpload
            Overwrites a file upload control on the current
            selection.
        
    
        
    
            InsertInputHidden
            Inserts a hidden control on the current
            selection.
        
    
        
    
            InsertInputImage
            Overwrites an image control on the current
            selection.
        
    
        
    
            InsertInputPassword
            Overwrites a password control on the current
            selection.
        
    
        
    
            InsertInputRadio
            Overwrites a radio control on the current
            selection.
        
    
        
    
            InsertInputReset
            Overwrites a reset control on the current
            selection.
        
    
        
    
            InsertInputSubmit
            Overwrites a submit control on the current
            selection.
        
    
        
    
            InsertInputText
            Overwrites a text control on the current
            selection.
        
    
        
    
            InsertMarquee
            Overwrites an empty marquee on the current
            selection.
        
    
        
    
            InsertOrderedList
            Toggles the current selection between an ordered
            list and a normal format block.
        
    
        
    
            InsertParagraph
            Overwrites a line break on the current
            selection.
        
    
        
    
            InsertSelectDropdown
            Overwrites a drop-down selection control on the
            current selection.
        
    
        
    
            InsertSelectListbox
            Overwrites a list box selection control on the
            current selection.
        
    
        
    
            InsertTextArea
            Overwrites a multiline text input control on the
            current selection.
        
    
        
    
            InsertUnorderedList
            Toggles the current 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.
        
    
        
    
            JustifyLeft
            Left-justifies the format block in which the current
            selection is located.
        
    
        
    
            JustifyRight
            Right-justifies the format block in which the
            current selection is located.
        
    
        
    
            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.
        
    
        
    
            Refresh
            Refreshes the current document.
        
    
        
    
            RemoveFormat
            Removes the formatting tags from the current
            selection.
        
    
        
    
            SelectAll
            Selects the entire document.
        
    
        
    
            SaveAs
            Saves the current Web page to a
            file.
        
    
        
    
            UnBookmark
            Removes any bookmark from the current
            selection.
        
    
        
    
            Underline
            Toggles the current selection between underlined and
            not underlined.
        
    
        
    
            Unlink
            Removes any hyperlink from the current
            selection.
        
    
        
    
            Unselect
            Clears the current
            selection.
        
    
        

    

    


    

    

    

    

    

    

    

		
    
			posted on 2008-11-26 13:40 星期五 閱讀(384) 評論(0)  編輯  收藏  
		
    
	
    
	
	


	


    
	    
    




    





    


    

	
    
		
    
				
		
	
		
    
		
		
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