<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Cache Editor for DataGrid - jQuery EasyUI Demo</title>
	<link rel="stylesheet" type="text/css" href="../../themes/default/easyui.css">
	<link rel="stylesheet" type="text/css" href="../../themes/icon.css">
	<link rel="stylesheet" type="text/css" href="../demo.css">
	<script type="text/javascript" src="../../jquery.min.js"></script>
	<script type="text/javascript" src="../../jquery.easyui.min.js"></script>
</head>
<body>
	<h2>Cache Editor for DataGrid</h2>
	<p>This example shows how to cache the editors for datagrid to improve the editing speed.</p>
	<div style="margin:20px 0;"></div>
	
	<table id="dg" class="easyui-datagrid" title="Cache Editor for DataGrid" style="width:700px;height:auto"
			data-options="
				iconCls: 'icon-edit',
				singleSelect: true,
				toolbar: '#tb',
				url: 'datagrid_data1.json',
				method: 'get',
				onClickRow: onClickRow
			">
		<thead>
			<tr>
				<th data-options="field:'itemid',width:80">Item ID</th>
				<th data-options="field:'productid',width:100,
						formatter:function(value,row){
							return row.productname;
						},
						editor:{
							type:'combobox',
							options:{
								valueField:'productid',
								textField:'productname',
								method:'get',
								url:'products.json',
								required:true
							}
						}">Product</th>
				<th data-options="field:'listprice',width:80,align:'right',editor:{type:'numberbox',options:{precision:1}}">List Price</th>
				<th data-options="field:'unitcost',width:80,align:'right',editor:'numberbox'">Unit Cost</th>
				<th data-options="field:'attr1',width:250,editor:'text'">Attribute</th>
				<th data-options="field:'status',width:60,align:'center',editor:{type:'checkbox',options:{on:'P',off:''}}">Status</th>
			</tr>
		</thead>
	</table>

	<div id="tb" style="height:auto">
		<a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-save',plain:true" onclick="accept()">Accept</a>
		<a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-undo',plain:true" onclick="reject()">Reject</a>
		<a href="javascript:void(0)" class="easyui-linkbutton" data-options="iconCls:'icon-search',plain:true" onclick="getChanges()">GetChanges</a>
	</div>
	
	<script type="text/javascript">
		(function($){
			function getCacheContainer(t){
				var view = $(t).closest('div.datagrid-view');
				var c = view.children('div.datagrid-editor-cache');
				if (!c.length){
					c = $('<div class="datagrid-editor-cache" style="position:absolute;display:none"></div>').appendTo(view);
				}
				return c;
			}
			function getCacheEditor(t, field){
				var c = getCacheContainer(t);
				return c.children('div.datagrid-editor-cache-' + field);
			}
			function setCacheEditor(t, field, editor){
				var c = getCacheContainer(t);
				c.children('div.datagrid-editor-cache-' + field).remove();
				var e = $('<div class="datagrid-editor-cache-' + field + '"></div>').appendTo(c);
				e.append(editor);
			}
			
			var editors = $.fn.datagrid.defaults.editors;
			for(var editor in editors){
				var opts = editors[editor];
				(function(){
					var init = opts.init;
					opts.init = function(container, options){
						var field = $(container).closest('td[field]').attr('field');
						var ed = getCacheEditor(container, field);
						if (ed.length){
							ed.appendTo(container);
							return ed.find('.datagrid-editable-input');
						} else {
							return init(container, options);
						}
					}
				})();
				(function(){
					var destroy = opts.destroy;
					opts.destroy = function(target){
						if ($(target).hasClass('datagrid-editable-input')){
							var field = $(target).closest('td[field]').attr('field');
							setCacheEditor(target, field, $(target).parent().children());
						} else if (destroy){
							destroy(target);
						}
					}
				})();
			}
		})(jQuery);
	</script>
	<script type="text/javascript">
		var editIndex = undefined;
		function endEditing(){
			if (editIndex == undefined){return true}
			if ($('#dg').datagrid('validateRow', editIndex)){
				var ed = $('#dg').datagrid('getEditor', {index:editIndex,field:'productid'});
				var productname = $(ed.target).combobox('getText');
				$('#dg').datagrid('getRows')[editIndex]['productname'] = productname;
				$('#dg').datagrid('endEdit', editIndex);
				editIndex = undefined;
				return true;
			} else {
				return false;
			}
		}
		function onClickRow(index){
			if (editIndex != index){
				if (endEditing()){
					$('#dg').datagrid('selectRow', index)
							.datagrid('beginEdit', index);
					editIndex = index;
				} else {
					$('#dg').datagrid('selectRow', editIndex);
				}
			}
		}
		function accept(){
			if (endEditing()){
				$('#dg').datagrid('acceptChanges');
			}
		}
		function reject(){
			$('#dg').datagrid('rejectChanges');
			editIndex = undefined;
		}
		function getChanges(){
			var rows = $('#dg').datagrid('getChanges');
			alert(rows.length+' rows are changed!');
		}
	</script>
</body>
</html>