JS集成fckeditor及判断内容是否为空的方法

<script type="text/javascript">
<!--
// Automatically calculates the editor base path based on the _samples directory.
// This is usefull only for these samples. A real application should use something like this:
// oFCKeditor.BasePath = '/fckeditor/' ; // '/fckeditor/' is the default value.
var sBasePath ='/fckeditor/';
var oFCKeditor = new FCKeditor( 'news_content' ) ;
oFCKeditor.BasePath = sBasePath ;
oFCKeditor.Height = 400 ;
oFCKeditor.Width = 600 ;
oFCKeditor.Value = '' ;
oFCKeditor.Create() ;
//-->
//取fck内容的长度
function GetMessageLength(str)
{
 var oEditor = FCKeditorAPI.GetInstance(str) ;
 var oDOM = oEditor.EditorDocument ;
 var iLength ;
 if ( document.all ) // If Internet Explorer.
 {
 iLength = oDOM.body.innerText.length ;
 }
 else // If Gecko.
 {
 var r = oDOM.createRange() ;
 r.selectNodeContents( oDOM.body ) ;
 iLength = r.toString().length ;
 }
// oEditor.InsertHtml('')
return iLength
} 
function CheckPost(){
 if(GetMessageLength("news_content")=='0')
 {
 alert('请输入内容');
 return false;
 }
}
//取fck内容
function GetMessageContent(str)
{
 var oEditor = FCKeditorAPI.GetInstance(str) ;
 return oEditor.GetXHTML();
}
</script>

$Config['UserFilesPath'] = '/upload/' ;
$Config['AllowedExtensions']['Image'] = array('bmp','gif','jpeg','jpg','png') ;
$Config['DeniedExtensions']['Image'] = array() ;
$Config['FileTypesPath']['Image'] = $Config['UserFilesPath'] . 'image/' ;
$Config['FileTypesAbsolutePath']['Image']= ($Config['UserFilesAbsolutePath'] == '') ? '' : $Config['UserFilesAbsolutePath'].'image/' ;
$Config['QuickUploadPath']['Image'] = $Config['UserFilesPath'] ;
$Config['QuickUploadAbsolutePath']['Image']= $Config['UserFilesAbsolutePath'] ;