buffer-grid.js
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Ext.Loader.setConfig({enabled: true});
Ext.Loader.setPath('Ext.ux', '../ux/');
Ext.require([
'Ext.grid.*',
'Ext.data.*',
'Ext.util.*',
'Ext.grid.PagingScroller'
]);
Ext.define('Employee', {
extend: 'Ext.data.Model',
fields: [
{name: 'rating', type: 'int'},
{name: 'salary', type: 'float'},
{name: 'name'}
]
});
Ext.onReady(function(){
/**
* Returns an array of fake data
* @param {Number} count The number of fake rows to create data for
* @return {Array} The fake record data, suitable for usage with an ArrayReader
*/
function createFakeData(count) {
var firstNames = ['Ed', 'Tommy', 'Aaron', 'Abe', 'Jamie', 'Adam', 'Dave', 'David', 'Jay', 'Nicolas', 'Nige'],
lastNames = ['Spencer', 'Maintz', 'Conran', 'Elias', 'Avins', 'Mishcon', 'Kaneda', 'Davis', 'Robinson', 'Ferrero', 'White'],
ratings = [1, 2, 3, 4, 5],
salaries = [100, 400, 900, 1500, 1000000];
var data = [];
for (var i = 0; i < (count || 25); i++) {
var ratingId = Math.floor(Math.random() * ratings.length),
salaryId = Math.floor(Math.random() * salaries.length),
firstNameId = Math.floor(Math.random() * firstNames.length),
lastNameId = Math.floor(Math.random() * lastNames.length),
rating = ratings[ratingId],
salary = salaries[salaryId],
name = Ext.String.format("{0} {1}", firstNames[firstNameId], lastNames[lastNameId]);
data.push({
rating: rating,
salary: salary,
name: name
});
}
return data;
}
// Create the Data Store.
// Because it is buffered, the automatic load will be directed
// through the prefetch mechanism, and be read through the page cache
var store = Ext.create('Ext.data.Store', {
id: 'store',
// allow the grid to interact with the paging scroller by buffering
buffered: true,
// Configure the store with a single page of records which will be cached
pageSize: 5000,
data: createFakeData(5000),
model: 'Employee',
proxy: {
type: 'memory'
}
});
var grid = Ext.create('Ext.grid.Panel', {
width: 700,
height: 500,
title: 'Bufffered Grid of 5,000 random records',
store: store,
loadMask: true,
selModel: {
pruneRemoved: false
},
viewConfig: {
trackOver: false
},
// grid columns
columns:[{
xtype: 'rownumberer',
width: 40,
sortable: false
},{
text: 'Name',
flex:1 ,
sortable: true,
dataIndex: 'name'
},{
text: 'Rating',
width: 125,
sortable: true,
dataIndex: 'rating'
},{
text: 'Salary',
width: 125,
sortable: true,
dataIndex: 'salary',
align: 'right',
renderer: Ext.util.Format.usMoney
}],
renderTo: Ext.getBody()
});
});