ExtJs使用自定义插件动态保存表头配置(隐藏或显示)

Ext.define('ux.plugin.ColumnCustom', {
 alias: 'plugin.columnCustom',
 xtype: 'columnCustom',
 //初始化
 init: function (gridPanel) {
 var me = this;
 me.owner = gridPanel;
 //根据已有配置项设置表头状态
 me.setColumnConfig(gridPanel);
 gridPanel.on({
 columnschanged: me.saveColumnConfig,
 scope: me
 });
 },
 setColumnConfig: function (gridPanel) {
 var me = this,
 xtype = gridPanel.getXType(),
 currentColumnConfig = me.getCurrentColumnConfig(),
 columnConfig = currentColumnConfig[xtype],
 columns = gridPanel.getColumns();
 if (!columnConfig) return;
 columns.forEach(function (column) {
 var dataIndex = column.config.dataIndex;
 //只有常规列才有显式的dataIndex，序号列等非常规列应排除在外
 if (!dataIndex) return;
 column.setHidden(columnConfig[dataIndex]);
 });
 },
 saveColumnConfig: function () {
 var me = this,
 gridPanel = me.owner,
 currentColumnConfig = me.getCurrentColumnConfig(),
 columns = gridPanel.getColumns(),
 xtype = gridPanel.getXType(),
 config = {};
 columns.forEach(function (column) {
 var dataIndex = column.config.dataIndex;
 //只有常规列才有显式的dataIndex，序号列等非常规列应排除在外
 if (!dataIndex) return;
 config[dataIndex] = column.isHidden();
 });
 //使用xtype作为索引是相对可靠的做法
 currentColumnConfig[xtype] = config;
 //localStorage的值类型限定为string类型
 localStorage.setItem('columnConfig', Ext.encode(currentColumnConfig));
 },
 getCurrentColumnConfig: function () {
 var allColumnConfigString = localStorage.getItem('columnConfig'),
 allColumnConfig = Ext.decode(allColumnConfigString, true);
 return allColumnConfig || {};
 }
});

Ext.define('override.grid.Panel', {
 override: 'Ext.grid.Panel',
 requires: ['ux.plugin.ColumnCustom'],
 columnCustomDisable: false,
 initComponent: function () {
 var me = this;
 me.callParent();
 //默认全部加上自动保存表头插件,此处追加一个可配属性来禁用此插件
 if (!me.columnCustomDisable) {
 me.addPlugin('columnCustom');
 }
 }
});