Extjs4 实现两个DataView之间元素的拖拽添加及删除

最近项目接到一个需求,要求用拖拽实现在两个Panel之间实现拖拽添加和删除元素的功能.

首先想到的是EXTJS提供的View组件,View组件绑定一个Store和Template就可以得到预期的UI显示效果,再加上EXTJS提供的DD(Drag and Drop)功能，则可以实现两个View组件之前的元素拖拽添加以及删除.

效果如下：

Demo代码实例如下：

Ext.onReady(function(){
    
    var columnData = [  
        ["Consignee", "1001"],["PO#", "1002"],["Cargo Origin", "1003"],["Cargo Origin Country", "1004"],
        ["Cargo Dest.", "1005"],["Cargo Destination Country", "1006"],["PO Status", "1007"],
        ["PO Vendor", "1008"],["Buyers", "1009"],["Bill to", "1010"],["Earliest Ship Date", "1011"],
        ["Latest Ship Date", "1012"]
    ];  

    var columnStore = new Ext.data.ArrayStore({  
        fields: ['fieldName','fieldOid'],  
        data: columnData  
    });  

    var selectedColumnStore = new Ext.data.ArrayStore({  
        fields: ['fieldName','fieldOid'],  
        data: []  
    });  

    var columnsView = Ext.create('Ext.view.View', {
        store: columnStore,
        id: 'columnsViewOid',
        xtype: 'dataview',
        tpl: [
            '<tpl for=".">',
                '<div class="thumb-wrap1" id="{fieldOid}">',
                '<div style="padding-left: 3px;">{fieldName}</div></div>',
            '</tpl>',
            '<div class="x-clear"></div>',
        ],
        trackOver: true,
        itemSelector: '.thumb-wrap1'
    });

    var selectedColumnsView = Ext.create('Ext.view.View', {
        store: selectedColumnStore,
        id: 'selectedColumnsViewOid',
        xtype: 'dataview',
        tpl: [
            '<tpl for=".">',
                '<div class="thumb-wrap1" id="{fieldOid}">',
                '<div style="padding-left: 3px;">{fieldName}  <img  src="images/del.gif" onclick = "deleteViewItem({fieldOid})"/></div></div>',
            '</tpl>',
            '<div class="x-clear"></div>',
        ],
        trackOver: true,
        itemSelector: '.thumb-wrap1'
    });
 
    
    Ext.create('Ext.Panel', {
        id: 'columnsDispPanelOid',
        autoScroll:true,
        width: 600,
        height:350,
        renderTo: 'columnsDispPanel',
        bodyPadding: 5,
        layout:'border',
        defaults: {
            split: true
        },
        items:[
            {
                xtype:'panel', region:'west', margin: '0 2 0 0', flex:1, items: columnsView,
                tbar:[
                    {xtype:'displayfield', value:'<span style="color:#04408c;font-weight:bolder;height:20px;line-height:19px;margin-left:3px"> Columns </span>', margin: '0 2 0 0'}
                ]
            },
            {
                xtype:'panel', region:'center', items: selectedColumnsView,
                tbar:[
                    {xtype:'displayfield', value:'<span style="color:#04408c;font-weight:bolder;height:20px;line-height:15px;margin-left:3px"> Selected Columns </span>', margin: '0 2 0 0'},
                    '-',
                    {
                        xtype: 'button',
                        icon: 'images/rpt_reset.png',
                        text: 'Reset',
                        id: 'selectedColumnResetID',
                        textAlign: 'right',
                        listeners:{
                            click: function() {
                                Ext.getCmp('selectedColumnsViewOid').getStore().loadData([]);
                            }
                        }
                   }
                ],
            }
        ]
    });


    /**
    * Drag zone overrides
    */
    var dragZoneOverrides = {
        containerScroll : true,
        scroll          : false,
        getDragData     : function(evtObj) {
            var columnsDataView = Ext.getCmp('columnsViewOid');
            var sourceEl = evtObj.getTarget(columnsDataView.itemSelector, 10);
            if (sourceEl) {
                var selectedNodes = columnsDataView.getSelectedNodes();
                var dragDropEl = document.createElement('div');
                if (selectedNodes.length < 1) {
                    selectedNodes.push(sourceEl);
                }
                Ext.each(selectedNodes, function(node) {
                    dragDropEl.appendChild(node.cloneNode(true));
                });
                return {
                    ddel           : dragDropEl,
                    repairXY       : Ext.fly(sourceEl).getXY(),
                    dragRecords    : columnsDataView.getRecord(sourceEl),
                    sourceDataView : columnsDataView
                };
            }

        },
        getRepairXY: function() {
            return this.dragData.repairXY;
        }
    };


    var onDragZoneCfg = Ext.apply({}, {
        ddGroup     : 'columnDDGrp',
        dataView    : Ext.getCmp('columnsViewOid')
    }, dragZoneOverrides);

    new Ext.dd.DragZone(Ext.getCmp('columnsViewOid').getEl(), onDragZoneCfg);

    
    /**
    * Drop zone overrides
    */
    var dropZoneOverrides = {
        onContainerOver : function() {
          return this.dropAllowed;
        },
        onContainerDrop : function(dropZone, evtObj, dragData) {
            var selectedColumnDataView = Ext.getCmp('selectedColumnsViewOid');
            var dragRecords = dragData.dragRecords;
            var store = selectedColumnDataView.store;
            var dupFound = false;
            Ext.each(dragRecords, function(record) {
                var found = store.findBy(function(r) {
                   return r.data.fieldName === record.data.fieldName;
                });
                if (found > -1 ) {
                    dupFound = true;
                }
            });

            if (!dupFound) {
                selectedColumnDataView.store.add(dragRecords.data);
            } else {
                Ext.MessageBox.alert('Warning', dragRecords.data.fieldName + ' already exist.');
            }
            return true;
        }
    };

    var onDropZoneCfg = Ext.apply({}, {
        ddGroup          : 'columnDDGrp',
        dataView         : Ext.getCmp('selectedColumnsViewOid')
    }, dropZoneOverrides);

    var onDropZone = new Ext.dd.DropZone(Ext.getCmp('selectedColumnsViewOid').ownerCt.el, onDropZoneCfg);

    deleteViewItem = function (oid) {
        var viewName = 'selectedColumnsViewOid';
        var delItems = [];
        var currentSelectedColumns = Ext.getCmp(viewName).store.data.items;
        Ext.Array.forEach (currentSelectedColumns, function(currentSelectedColumn, index) {
            if (currentSelectedColumn.data.fieldOid == oid) {
                delItems.push(currentSelectedColumn);
                Ext.getCmp(viewName).store.remove(delItems);
            }
        })
    }

});      

 jsfiddle 预览： http://jsfiddle.net/8L0keqd7/