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Ext-JS Grid Panel Column Renderer

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="ext3/css/ext-all.css" />
<style type="text/css">
.trend-down
{
background:url(img/trend-down.png) 20px no-repeat
!important;
}
.trend-neutral
{
background:url(img/trend-neutral.png) 20px no-repeat
!important;
}
.trend-up
{
background:url(img/trend-up.png) 20px no-repeat !important;
}
</style>

<script type="text/javascript" src="ext3/ext-base.js"></script>

<script type="text/javascript" src="ext3/ext-all-debug.js"></script>

<script type="text/javascript">

Ext.BLANK_IMAGE_URL = 'ext3/images/default/s.gif';


var store = new Ext.data.ArrayStore({
fields: ['title', 'rentals', 'trend'],
data: [['ACADEMY DINOSAUR', 305,'up' ],
['DRAGONFLY STRANGERS', 240, 'neutral'],
['FAMILY SWEET', 188, 'down'],
['FREAKY POCUS', 205, 'up'],
['GABLES METROPOLIS',265,'up']]
});

Ext.onReady(function() {

var grid = new Ext.grid.GridPanel({
title: 'Movie rentals this month',
store: store,
columns: [
{ id: 'title-col', header: "Title", width: 180, dataIndex:
'title', sortable: true },
{ header: "Rentals", width: 75, dataIndex: 'rentals',
sortable: true, align: 'right' },
{ header: "Trend", width: 75, resizable: false, dataIndex:
'trend', sortable: true, align: 'center',
renderer: function(value, metaData, record, rowIndex,
colIndex, store) {
switch (value) {
case 'down':
metaData.css = 'trend-down';
break;
case 'neutral':
metaData.css = 'trend-neutral';
break;
case 'up':
metaData.css = 'trend-up';
break;
}
return ''; // Do not return anything so only
the cell's background is visible
}
}
],
autoExpandColumn: 'title-col',
renderTo: Ext.getBody(),
width: 350,
height: 200,
loadMask: true
});

});

</script>

</head>
<body style="padding: 20px">
</body>
</html>

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