[4.2.0 beta 2] Buffered store, repeating rows for remote data

**vladsch** · 7 Feb 2013 1:21 PM

REQUIRED INFORMATION

Ext version tested:

Ext 4.2.0 beta 2

Browser versions tested against:

IE9
Chrome 24

DOCTYPE tested against:

<!DOCTYPE html>

Description:

If use buffered store with ajax proxy then rows start repeating during scrolling

Steps to reproduce the problem:

Open the following test case (in this sample I used memory proxy with deffered reading)
Start scrolling
Notice row number and company index don't match after a row with index 100
If use bufferedrenderer plugin instead buffered store's option then all works fine

The result that was expected:

Grid should display data correctly

The result that occurs instead:

Incorrect data representation

Test Case:

Code:

<!DOCTYPE html>
<html>
<head>
    <title></title>    
	<link rel="stylesheet" type="text/css" href="../../resources/css/ext-all.css" />
	<script type="text/javascript" src="../../ext-all.js"></script>	

	<script type="text/javascript">		
		Ext.onReady(function () {
			var data = [];
			for (var i = 1; i <= 500; i++) {
				data.push({company: "Company " + i});
			}
			
			Ext.create("Ext.grid.Panel", {
				store: {
					fields: [{
						name: "company"
					}],					
					autoLoad: true,
					proxy: {
						type: "memory",
						data : data,
						read : function () {
							Ext.defer(Ext.data.proxy.Memory.prototype.read, 1000, this, arguments);
						}
					},
					buffered: true,
					pageSize: 100
				},
				height: 350,
				renderTo: document.body,
				width: 650,
				title: "Sample Grid",
				columns: [{
						width: 50,
						xtype: "rownumberer"
					}, {
						id: "Column1",
						flex: 1,
						dataIndex: "company",
						text: "Company"
					}]				
			});
		});
    </script>
	
</head>
<body>
</body>
</html>

Operating System:

Win7

**mitchellsimoens** · 7 Feb 2013 1:33 PM

So if I change it to use an ajax proxy instead of the memory in your example I will see the same issue where row 101 will be the same as row 1?

**vladsch** · 7 Feb 2013 1:36 PM

Yes, if your server will return the same data (as in example) then you will see the same issue
Did you able to reproduce the issue with my test case?

[4.2.0 beta 2] Buffered store, repeating rows for remote data

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[4.2.0 beta 2] Buffered store, repeating rows for remote data

[4.2.0 beta 2] Buffered store, repeating rows for remote data