ExtJS 4.2 实现多文件上传与管理

Ext.define('ZcWeb.component.form.UpDownLoadPanel', {
    extend: 'Ext.form.Panel',
    alias: 'widget.zcupdownloadpanel',
    zc_billIndex: 0,
    o_gridStore: false,
    o_gridPanel: false,
    p_deleteFiles:'',

    constructor: function (config) {
        var me = this;
        me.o_gridStore = new Ext.data.Store({
            fields: [{ name: 'FFuJianName', type: 'string', iszcField: true },
              { name: 'FFuJianServerFileName', type: 'string', iszcField: true },
              { name: 'FFileMimeType', type: 'string', iszcField: true },
              { name: 'FFilePath', type: 'string', iszcField: true },
              { name: 'FFileInputID', type: 'string', iszcField: true }],
            autoDestroy: true,
            proxy: {
                type: 'ajax',
                url: '../Home/GetDataUserSql',
                timeout: 90000,
                reader: {
                    type: 'json',
                    root: 'data',
                    totalProperty: 'totalCount'
                },
                listeners: {
                    scope: this,
                    exception: function (sender, response, operation, eOpts) {
                        if (operation.error) {

                            if (operation.error.status == 404) {
                                ZC_Message_Error('加载单据附件错误，请求地址未找到!');
                            }
                            else
                                ZC_Message_Error('加载单据附件错误，错误信息：<br />' + operation.error.statusText);
                        }
                        else {
                            var _errorserverjson = Ext.decode(response.responseText, true);
                            if (_errorserverjson == null) {
                                ZC_Message_Error('加载单据附件错误!');
                            }
                            else
                                ZC_Message_Error('加载单据附件错误，错误信息：<br />' + _errorserverjson.error);
                        }
                    }
                }
            }
        });
        me.o_gridPanel = new Ext.grid.Panel({
            store: me.o_gridStore,
            frame: false,
            border: 0,
            columnLines: true,
            columns: [{ xtype: 'rownumberer' },
                      { align: 'center', text: "附件名称", dataIndex: 'FFuJianName', width: 350, sortable: false, renderer: function (value) { return '<div style="vertical-align: middle; text-align: left; height: 100%">' + value + '</div>'; } },
                      { align: 'center', text: "文件路径", dataIndex: 'FFilePath', width: 250, sortable: false, renderer: function (value) { return '<div style="vertical-align: middle; text-align: left; height: 100%">' + value + '</div>'; } }],
            viewConfig: { loadingText: '正在加载数据...' },
            tbar: [{
                text: '添加附件',
                handler: function () {