ほら、すべてを処理するわけではありませんが、十分なはずです。
Ext.define('HideColumnIfEmpty', {
extend: 'Ext.AbstractPlugin',
alias: 'plugin.hideColumnIfEmpty',
mixins: {
bindable: 'Ext.util.Bindable'
},
init: function(grid) {
this.grid = grid;
this._initStates();
this.grid.on('reconfigure', this._initStates, this);
},
_initStates: function(store, columns) {
var store = this.grid.getStore(),
columns = this.grid.columns;
this.bindStore(store);
this.columns = columns;
if(store.getCount() > 0) {
this._maybeHideColumns();
}
},
/**
*@implement
*/
getStoreListeners: function() {
return {
load: this._maybeHideColumns
};
},
_maybeHideColumns: function() {
var columns = this.columns,
store = this.store,
columnKeysMc = new Ext.util.MixedCollection();
Ext.Array.forEach(columns, function(column) {
columnKeysMc.add(column.dataIndex, column);
});
Ext.Array.some(store.getRange(),function(record){
//don't saw off the branch you are sitting on
//eachKey does not clone
var keysToRemove = [];
columnKeysMc.eachKey(function(key) {
if(!Ext.isEmpty(record.get(key))) {
keysToRemove.push(key);
}
});
Ext.Array.forEach(keysToRemove, function(k) {
columnKeysMc.removeAtKey(k);
});
return columnKeysMc.getCount() === 0;
});
columnKeysMc.each(function(column) {
column.hide();
});
}
});
次に例を示します。
Ext.create('Ext.data.Store', {
storeId:'simpsonsStore',
fields:['name', 'email', 'phone'],
data:{'items':[
{ 'name': 'Lisa', "email":"lisa@simpsons.com", "phone":"555-111-1224" },
{ 'name': 'Bart', "email":"bart@simpsons.com", "phone":"555-222-1234" },
{ 'name': 'Homer', "email":"home@simpsons.com", "phone":"555-222-1244" },
{ 'name': 'Marge', "email":"marge@simpsons.com", "phone":"555-222-1254" }
]},
proxy: {
type: 'memory',
reader: {
type: 'json',
root: 'items'
}
}
});
Ext.create('Ext.grid.Panel', {
title: 'Simpsons',
store: Ext.data.StoreManager.lookup('simpsonsStore'),
columns: [
{ text: 'Name', dataIndex: 'name' },
{ text: 'Email', dataIndex: 'email', flex: 1 },
{ text: 'Phone', dataIndex: 'phone' },
{ text: 'Says Doh', dataIndex: 'saysDoh'}
],
plugins: {ptype: 'hideColumnIfEmpty'},
height: 200,
width: 400,
renderTo: Ext.getBody()
});
この例では、saysDoh 列が非表示になっていることがわかります。