ext2.0扩展树形下拉框(代码及演示)

 转自: http://www.javaeye.com/topic/148441

演示地址：www.gx80.cn/example/ext-2.0/form/treeField.html

原代码：

js 代码

/**
 * Ext JS Library 2.0 extend
 * Version : 1.0
 * Author : 飞天色鼠
 * Date : 2007-12-13
 * E-mail : gx80@qq.com
 * HomePage : http://www.gx80.cn
 */

/**
 * TreeField
 */
Ext.form.TreeField = Ext.extend(Ext.form.TriggerField,  {
    readOnly : true ,
    defaultAutoCreate : {tag: "input", type: "text", size: "24", autocomplete: "off"},
    displayField : 'text',
    valueField : undefined,
    hiddenName : undefined,
    listWidth : undefined,
    minListWidth : 50,
    layerHeight : undefined,
    minLayerHeight : 60,
    dataUrl : undefined,
    tree : undefined,
    value : undefined,
    baseParams : {},
    treeRootConfig : {
        id : ' ',
        text : 'please select...',
        draggable:false
        },
    initComponent : function(){
        Ext.form.TreeField.superclass.initComponent.call(this);
        this.addEvents(
                'select',
                'expand',
                'collapse',
                'beforeselect'
        );

        if(this.transform){
            this.allowDomMove = false;
            var s = Ext.getDom(this.transform);
            if(!this.hiddenName){
                this.hiddenName = s.name;
            }

            s.name = Ext.id();
            if(!this.lazyRender){
                this.target = true;
                this.el = Ext.DomHelper.insertBefore(s, this.autoCreate || this.defaultAutoCreate);
                Ext.removeNode(s);
                this.render(this.el.parentNode);
            }else{
                Ext.removeNode(s);
            }

        }
    },
    onRender : function(ct, position){
        Ext.form.TreeField.superclass.onRender.call(this, ct, position);
        if(this.hiddenName){
            this.hiddenField = this.el.insertSibling({tag:'input', type:'hidden', name: this.hiddenName, id: (this.hiddenId||this.hiddenName)},
                    'before', true);
            this.hiddenField.value =
                this.hiddenValue !== undefined ? this.hiddenValue :
                this.value !== undefined ? this.value : '';
            this.el.dom.removeAttribute('name');
        }
        if(Ext.isGecko){
            this.el.dom.setAttribute('autocomplete', 'off');
        }

        this.initList();
    },
    initList : function(){
        if(!this.list){
            var cls = 'x-treefield-list';

            this.list = new Ext.Layer({
                shadow: this.shadow, cls: [cls, this.listClass].join(' '), constrain:false
            });

            var lw = this.listWidth || Math.max(this.wrap.getWidth(), this.minListWidth);
            this.list.setWidth(lw);
            this.list.swallowEvent('mousewheel');

            this.innerList = this.list.createChild({cls:cls+'-inner'});
            this.innerList.setWidth(lw - this.list.getFrameWidth('lr'));
            this.innerList.setHeight(this.layerHeight || this.minLayerHeight);
            if(!this.tree){
                this.tree = this.createTree(this.innerList);
            }
            var treeField = this;
            this.tree.on('click',function(node,e){
                treeField.onSelect(node);
            });
            this.tree.render();
        }
    },
    onSelect:function(node){
        if(this.fireEvent('beforeselect', node, this)!= false){
            this.setValue(node);
            this.collapse();
            this.fireEvent('select', this, node);
        }
    },
    createTree:function(el){
        var Tree = Ext.tree;

        var tree = new Tree.TreePanel({
            el:el,
            autoScroll:true,
            animate:true,
            containerScroll: true,
            loader: new Tree.TreeLoader({
                dataUrl : this.dataUrl,
                baseParams : this.baseParams
            })
        });

        var root = new Tree.AsyncTreeNode(this.treeRootConfig);
        tree.setRootNode(root);
        return tree;
    },
    getValue : function(){
        if(this.valueField){
            return typeof this.value != 'undefined' ? this.value : '';
        }else{
            return Ext.form.TreeField.superclass.getValue.call(this);
        }
    },
    setValue : function(node){
        var text = node[this.displayField];
        var value = node[this.valueField || this.displayField];
        if(this.hiddenField){
            this.hiddenField.value = value;
        }
        Ext.form.TreeField.superclass.setValue.call(this, text);
        this.value = value;
    },
    onDestroy : function(){
        if(this.list){
            this.list.destroy();
        }
        Ext.form.TreeField.superclass.onDestroy.call(this);
    },
    collapseIf : function(e){
        if(!e.within(this.wrap) && !e.within(this.list)){
            this.collapse();
        }
    },
    expand : function(){
        if(this.isExpanded() || !this.hasFocus){
            return;
        }
        this.list.alignTo(this.wrap, this.listAlign);
        this.list.show();
        Ext.getDoc().on('mousewheel', this.collapseIf, this);
        Ext.getDoc().on('mousedown', this.collapseIf, this);
        this.fireEvent('expand', this);
    },
    collapse : function(){
        if(!this.isExpanded()){
            return;
        }
        this.list.hide();
        Ext.getDoc().un('mousewheel', this.collapseIf, this);
        Ext.getDoc().un('mousedown', this.collapseIf, this);
        this.fireEvent('collapse', this);
    },
    isExpanded : function(){
        return this.list && this.list.isVisible();
    },
    onTriggerClick : function(){
        if(this.disabled){
            return;
        }
        if(this.isExpanded()){
            this.collapse();
        }else {
            this.onFocus({});
            this.expand();
        }
        this.el.focus();
    }

});
Ext.reg('treefield', Ext.form.TreeField);