extjs 之Tree(columnTree) to jsonstring

/* tostring.js */ 

/** 
* Returns a string of Json that represents the tree 
* @param {Function} (optional) A function, which when passed the node, returns true or false to include 
* or exclude the node. 
* @param {Function} (optional) A function, which when passed an attribute name, and an attribute value, 
* returns true or false to include or exclude the attribute. 
* @return {String} 
*/ 
Ext.tree.TreePanel.prototype.toJsonString =  function(nodeFilter, attributeFilter, attributeMapping){ 
             return  this.getRootNode().toJsonString(nodeFilter, attributeFilter, attributeMapping); 
}; 

/** 
* Returns a string of Json that represents the node 
* @param {Function} (optional) A function, which when passed the node, returns true or false to include 
* or exclude the node. 
* @param {Function} (optional) A function, which when passed an attribute name, and an attribute value, 
* returns true or false to include or exclude the attribute. 
* @return {String} 
*/ 
Ext.tree.TreeNode.prototype.toJsonString =  function(nodeFilter, attributeFilter, attributeMapping){ 
//  Exclude nodes based on caller-supplied filtering function 
         if (nodeFilter && (nodeFilter( this) ==  false)) { 
                 return ''; 
        } 
         var c =  false, result =  "{"; 

//  Add the id attribute unless the attribute filter rejects it. 
         if (!attributeFilter || attributeFilter( "id",  this.id)) { 
                result += ' "id:"' +  this.id; 
                c =  true; 
        } 

//  Add all user-added attributes unless rejected by the attributeFilter. 
         for( var key  in  this.attributes) { 
                 if ((key != 'id') && (!attributeFilter || attributeFilter(key,  this.attributes[key]))) { 
                  if (c) result += ','; 
       if (attributeMapping && attributeMapping[key]) { 
        thisKey = attributeMapping[key]; 
      }  else { 
        thisKey = key; 
      } 
                 result += ' "' + thisKey + '": "' + this.attributes[key] + '"'; 
                 c =  true; 
         } 
        } 

//  Add child nodes if any 
         var children =  this.childNodes; 
         var clen = children.length; 
         if(clen != 0){ 
                 if (c) result += ','; 
                result += ' "children":['; 
                 for( var i = 0; i < clen; i++){ 
                         if (i > 0) result += ','; 
                        result += children[i].toJsonString(nodeFilter, attributeFilter, attributeMapping); 
                } 
                result += ']'; 
        } 
         return result +  "}"; 
}; 

/** 
* Returns a string of XML that represents the tree 
* @param {Function} (optional) A function, which when passed the node, returns true or false to include 
* or exclude the node. 
* @param {Function} (optional) A function, which when passed an attribute name, and an attribute value, 
* returns true or false to include or exclude the attribute. 
* @return {String} 
*/ 
Ext.tree.TreePanel.prototype.toXmlString =  function(nodeFilter, attributeFilter, attributeMapping){ 
   return '\u003C?xml version= "1.0"?>\u003Ctree>' + 
     this.getRootNode().toXmlString(nodeFilter, attributeFilter, attributeMapping) + 
    '\u003C/tree>'; 
}; 

/** 
* Returns a string of XML that represents the node 
* @param {Function} (optional) A function, which when passed the node, returns true or false to include 
* or exclude the node. 
* @param {Function} (optional) A function, which when passed an attribute name, and an attribute value, 
* returns true or false to include or exclude the attribute. 
* @return {String} 
*/ 
Ext.tree.TreeNode.prototype.toXmlString =  function(nodeFilter, attributeFilter, attributeMapping){ 
//  Exclude nodes based on caller-supplied filtering function 
         if (nodeFilter && (nodeFilter( this) ==  false)) { 
                 return ''; 
        } 
         var result = '\u003Cnode'; 

//  Add the id attribute unless the attribute filter rejects it. 
         if (!attributeFilter || attributeFilter( "id",  this.id)) { 
                result += ' id= "' + this.id + '"'; 
        } 

//  Add all user-added attributes unless rejected by the attributeFilter. 
         for( var key  in  this.attributes) { 
                 if ((key != 'id') && (!attributeFilter || attributeFilter(key,  this.attributes[key]))) { 
                  if (attributeMapping && attributeMapping[key]) { 
        thisKey = attributeMapping[key]; 
      }  else { 
        thisKey = key; 
      } 
      result += ' ' + thisKey + '= "' + this.attributes[key] + '"'; 
         } 
        } 

//  Add child nodes if any 
         var children =  this.childNodes; 
         var clen = children.length; 
         if(clen == 0){ 
                result += '/>'; 
        } else{ 
                result += '>'; 
                 for( var i = 0; i < clen; i++){ 
                        result += children[i].toXmlString(nodeFilter, attributeFilter, attributeMapping); 
                } 
                result += '\u003C/node>'; 
        } 
         return result; 
};

   function contextmenu(node, e) { 
    node.select(); 
     if (node.isLeaf()) { 
       var json = node.toJsonString( null,  function(key, val) { 
         return (key == 'loginfo'); 
      }, { 
        loginfo : 'loginfo' 
      }); 
      alert( "步骤日志:" + json); 
    } 
  }

本文转自elbertchen 51CTO博客，原文链接：http://blog.51cto.com/linkyou/751928，如需转载请自行联系原作者