我的Ext下拉树型框的实现

cms.form.ComboTree = function(options) {
	cms.form.ComboTree.superclass.constructor.call(this, options);
};

Ext.extend(cms.form.ComboTree, Ext.form.TriggerField, {
	triggerClass : 'x-form-arrow-trigger',
	shadow : 'sides',
	lazyInit : true,
	initComponent : function() {
		cms.form.ComboTree.superclass.initComponent.call(this);
	},

	onRender : function(ct, position) {
		Ext.form.ComboBox.superclass.onRender.call(this, ct, position);
		var hiddenName = this.name;

		this.hiddenField = this.el.insertSibling({
			tag : 'input',
			type : 'hidden',
			name : hiddenName
		}, 'before', true);

		this.hiddenField.value = this.value !== undefined ? this.value : 0;

		this.el.dom.removeAttribute('name');
		this.id = this.name;

		if (!this.lazyInit) {
			this.initList();
		} else {
			this.on('focus', this.initList, this, {
				single : true
			});
		}
	},

	initList : function() {
		if (this.list) {
			return;
		}
		this.list = new Ext.Layer({
			shadow : this.shadow,
			cls : 'x-combo-list',
			constrain : false
		});

		this.root = new Ext.tree.AsyncTreeNode({expanded :true});
		this.list.setWidth(Math.max(this.wrap.getWidth(), 70));
		tree = new Ext.tree.TreePanel({
			autoScroll : true,
			height : 200,
			border : false,
			root : this.root,
			loader : this.loader
		});

		delete this.loader;

		tree.on('click', this.onClick, this);
		tree.render(this.list);

		this.el.dom.setAttribute('readOnly', true);
		this.el.addClass('x-combo-noedit');
	},
	
	expandNode : function(n, v){
		var cs = n.childNodes;
        for(var i = 0, len = cs.length; i < len; i++) {
        	if(cs[i].id == v){
        		return true;
        	}
        	if(expandNode(cs[i], v)){
				cs[i].expand();
				return true;
        	}
        }
        return false;
	},


	validateValue : function(value) {
		return true;
	},

	validateBlur : function() {
		return !this.list || !this.list.isVisible();
	},

	onDestroy : function() {
		if (this.wrap) {
			this.wrap.remove();
		}
		if (this.list) {
			this.list.destroy();
		}
		cms.form.ComboTree.superclass.onDestroy.call(this);
	},

	isExpanded : function() {
		return this.list && this.list.isVisible();
	},

	collapse : function() {
		if (this.isExpanded()) {
			this.list.hide();
		}
	},

	onClick : function(node) {
		this.setValue(node);
		this.collapse();
	},


	setValue : function(v) {
		var val = v;
		if(typeof v === 'object'){
			this.hiddenField.value = ((this.root && v.id == this.root.id) ? 0 : v.id);
			val = v.text;
		}
		cms.form.ComboTree.superclass.setValue.call(this, val);
	},

	initEvents : function() {
		cms.form.ComboTree.superclass.initEvents.call(this);
		this.el.on('mousedown', this.onTriggerClick, this);
	},

	onTriggerClick : function() {
		if (this.disabled) {
			return;
		}

		if (this.isExpanded()) {
			this.collapse();
			this.el.focus();
		} else {
			this.onFocus({});
			this.list.alignTo(this.wrap, 'tl-bl?');
			this.list.show();
		}
	}

});
Ext.reg('combotree', cms.form.ComboTree); 
做了些修改，重新发了代码，用法和普通field没有什么区别，功能也一样。目前没有遇到什么BUG。

 

 

 

 

很好！把url和树的一些属性单独列出来   很完美的

lz为什么不查查以前的帖子呢

我们都发过了

还发过 下拉 多选框的树~