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   1  /**

   2   * functions for auto save

   3   */
   4  
   5  // Before you change the following values, please make sure the total cookie size of the domain does not exceed 

   6  // your LimitRequestFieldsize value in Apache. Or you will get a ugly error message like this in your browser: 

   7  //

   8  // [Bad Request: Size of a request header field exceeds server limit]

   9  //

  10  // The default LimitRequestFieldsize value of apache is 8192 bytes.

  11   
  12  // In generally, the cookie size is 4096 bytes, So this number should be smaller then 4096

  13  var maxBackupCookieLength = 3240;
  14  
  15  // How many cookies we can use per postText and PostExtentedText

  16  var maxBackupCookiesPerBlog = 1;
  17  
  18  // It doesn't make sense just backup few characters, use this to control the minimal backup length

  19  var minBackupLength = 9;
  20  
  21  // The time interval between two post backup, the default is 5 seconds

  22  var backupInterval = 5;
  23  
  24  // Timer we used for post backup

  25  var backupTimer;
  26  
  27  // Cookies we used in auto save

  28  var postNotSavedCookieName = LTCookieBaseName + "postNotSaved";
  29  var postTopicCookieName = LTCookieBaseName + "postTopic";
  30  var postTextCookieName = LTCookieBaseName + "postText";
  31  
  32  function deleteBackupPostFromCookie()
  33  {
  34      deleteCookie( postNotSavedCookieName );
  35      for( cookieNum = 0; cookieNum < maxBackupCookiesPerBlog; cookieNum++ )
  36      {
  37          deleteCookie( postTopicCookieName + cookieNum );
  38          deleteCookie( postTextCookieName + cookieNum );
  39      }
  40  }
  41  
  42  function saveBackupPostToCookie( cookieName, content )
  43  {
  44      // Clear old post, I know it stupid. But it seems the best way to keep the data clean.

  45      // If we use mutiple cookies to compose a single post.

  46      for( cookieNum = 0; cookieNum < maxBackupCookiesPerBlog; cookieNum++ )
  47      {
  48          deleteCookie( cookieName + cookieNum );
  49      }
  50  
  51      var dataIndex = 0;
  52      var cookieNum = 0;
  53      var data = escape( content );
  54      while ( ( dataIndex < data.length ) && ( cookieNum < maxBackupCookiesPerBlog ) ) {
  55          var cookieData = data.substring(dataIndex, dataIndex + maxBackupCookieLength);
  56          setCookie( cookieName + cookieNum, cookieData, 1);
  57          dataIndex += maxBackupCookieLength;
  58          cookieNum++;
  59      }
  60  }
  61  
  62  function loadBackupPostFromCookie( cookieName )
  63  {
  64      var content = "";
  65      for( cookieNum = 0; cookieNum < maxBackupCookiesPerBlog; cookieNum++ )
  66      {
  67          data = getCookie( cookieName + cookieNum );
  68          if ( data )
  69              content += data;
  70          else
  71              break;
  72      }    
  73  
  74      return unescape( content );
  75  }
  76  
  77  function backupPost()
  78  {
  79      postTopic = $('postTopic').value;
  80      
  81      if( htmlAreaEnabled )
  82      {
  83          postText = tinyMCE.getInstanceById('postText').getBody().innerHTML;
  84      }
  85      else
  86      {
  87          postText = $('postText').value;
  88      }
  89  
  90      if( postTopic.length > minBackupLength )
  91      {
  92          setCookie( postNotSavedCookieName, 1, 1);
  93          saveBackupPostToCookie( postTopicCookieName, postTopic );
  94      }
  95          
  96      if( postText.length > minBackupLength )
  97      {
  98          setCookie( postNotSavedCookieName, 1, 1);
  99          saveBackupPostToCookie( postTextCookieName, postText );
 100      }
 101  }
 102  
 103  function initialAutoSave()
 104  {
 105      postNotSaved = getCookie( postNotSavedCookieName );
 106      if ( postNotSaved == 1 )
 107      {
 108          $('autoSaveMessage').innerHTML = msgAutoSaveMessage;
 109          Element.show($('autoSaveMessage'));
 110      }
 111      else
 112      {
 113          deleteBackupPostFromCookie();
 114      }
 115  }
 116  
 117  function startAutoSave() {
 118      backupTimer = setInterval('backupPost();', backupInterval * 1000 );
 119  }
 120  
 121  function restartAutoSave() {
 122      deleteBackupPostFromCookie();
 123      clearInterval( backupTimer );
 124      setTimeout( 'startAutoSave();', backupInterval * 1000 );
 125  }
 126  
 127  function restoreAutoSave()
 128  {
 129      $('postTopic').value = loadBackupPostFromCookie( postTopicCookieName );
 130      
 131      if( htmlAreaEnabled )
 132      {
 133          tinyMCE.getInstanceById('postText').getBody().innerHTML  = loadBackupPostFromCookie( postTextCookieName );
 134      }
 135      else
 136      {
 137          $('postText').value = loadBackupPostFromCookie( postTextCookieName );
 138      }
 139      
 140      $('autoSaveMessage').innerHTML = '';
 141      Element.hide($('autoSaveMessage'));
 142  }
 143  
 144  function eraseAutoSave()
 145  {
 146      deleteBackupPostFromCookie();
 147      
 148      $('autoSaveMessage').innerHTML = '';
 149      Element.hide($('autoSaveMessage'));
 150  }