ext两张表构成的tree结构防止id重复的方法（二）

第二步：重写Ext.tree.TreePanel类的registerNode方法，记tree注册treeid为真实

ID

Ext.override(Ext.tree.TreePanel,{   
    getNodeByTreeId : function(treeid){   
        return this.nodeHash[treeid];   
    },   
    registerNode : function(node){   
        this.nodeHash[node.attributes.treeid] = node;   
    },   
    unregisterNode : function(node){   
        delete this.nodeHash[node.attributes.treeid];   
    }   
  
});

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第三步：重写Ext.tree.TreeNode类的ensureVisible 方法，使其调用的getNodeByTreeId为treeid

Ext.override(Ext.tree.TreeNode,{
    ensureVisible : function(callback){
        var tree = this.getOwnerTree();   
        tree.expandPath(this.parentNode.getPath(), false, function(){   
            var node = tree.getNodeByTreeId(this.attributes.treeid);  // Somehow if we don't do this, we lose changes that happened to node in the meantime   
            tree.getTreeEl().scrollChildIntoView(node.ui.anchor);   
            Ext.callback(callback);   
        }.createDelegate(this));   
    }   
});

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第四步：重写Ext.tree.TreeEventModel类getNode方法，使其调getNodeByTreeId方法

Ext.override(Ext.tree.TreeEventModel,{   
    getNode : function(e){   
        var t;   
        if(t = e.getTarget('.x-tree-node-el', 10)){   
            var id = Ext.fly(t, '_treeEvents').getAttributeNS('ext', 'tree-node-id');   
            if(id){   
                return this.tree.getNodeByTreeId(id);   
            }   
        }   
        return null;   
    }   
});

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经过上面的4步以后，“ext2的tree id不唯一的解决方法”一文中还有第5步，写的不是很详细

第五步：重写Ext.tree.TreeNodeUI类，我这里采用的是继承，覆盖renderElements方法

Ext.override(Ext.tree.TreeNodeUI,{
	renderElements:function(D,I,H,J){				
		this.indentMarkup=D.parentNode?D.parentNode.ui.getChildIndent():"";
		var E=typeof I.checked=="boolean";
		var B=I.href?I.href:Ext.isGecko?"":"#";
		var C=["<li class=\"x-tree-node\"><div ext:tree-node-id=\"",D.attributes.treeid,"\" class=\"x-tree-node-el x-tree-node-leaf x-unselectable ",I.cls,"\" unselectable=\"on\">","<span class=\"x-tree-node-indent\">",this.indentMarkup,"</span>","<img src=\"",this.emptyIcon,"\" class=\"x-tree-ec-icon x-tree-elbow\" />","<img src=\"",I.icon||this.emptyIcon,"\" class=\"x-tree-node-icon",(I.icon?" x-tree-node-inline-icon":""),(I.iconCls?" "+I.iconCls:""),"\" unselectable=\"on\" />",E?("<input class=\"x-tree-node-cb\" type=\"checkbox\" "+(I.checked?"checked=\"checked\" />":"/>")):"","<a hidefocus=\"on\" class=\"x-tree-node-anchor\" href=\"",B,"\" tabIndex=\"1\" ",I.hrefTarget?" target=\""+I.hrefTarget+"\"":"","><span unselectable=\"on\">",D.text,"</span></a></div>","<ul class=\"x-tree-node-ct\" style=\"display:none;\"></ul>","</li>"].join("");
		var A;				
		if(J!==true&&D.nextSibling&&(A=D.nextSibling.ui.getEl())){					
			this.wrap=Ext.DomHelper.insertHtml("beforeBegin",A,C);
		}else{					
			this.wrap=Ext.DomHelper.insertHtml("beforeEnd",H,C);
		}
		this.elNode=this.wrap.childNodes[0];
		this.ctNode=this.wrap.childNodes[1];
		var G=this.elNode.childNodes;
		this.indentNode=G[0];
		this.ecNode=G[1];
		this.iconNode=G[2];
		var F=3;
		if(E){
			this.checkbox=G[3];
			F++;
		}
		this.anchor=G[F];
		this.textNode=G[F].firstChild;
	}
});

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注:在我的项目中没有去添加这个步骤,因为我采用了文章开头说的TreeCheckNodeUI.js，不过对这个js作了小的调整。修改的地方如下：

主要是这句：

var buf = ['<li class="x-tree-node"><div ext:tree-node-id="',n.treeType+n.id,'" class="x-tree-node-el x-tree-node-leaf x-unselectable ', a.cls,'" unselectable="on">',

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在上面一句用到了n.treeType这个属性，在ext-all.js里面是没有这个属性的，这就需要我们自己添加上去。代码如下：(修改ext-all.js)

Ext.data.Node=function(A){this.attributes=A||{};this.leaf=this.attributes.leaf;this.treeType=this.attributes.treeType;this.id=this.attributes.id;。。