LiveUpdates.js
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Ext.require([
'Ext.window.Window',
'Ext.chart.*'
]);
Ext.onReady(function () {
var chart;
var generateData = (function() {
var data = [], i = 0,
last = false,
date = new Date(2011, 1, 1),
seconds = +date,
min = Math.min,
max = Math.max,
random = Math.random;
return function() {
data = data.slice();
data.push({
date: Ext.Date.add(date, Ext.Date.DAY, i++),
visits: min(100, max(last? last.visits + (random() - 0.5) * 20 : random() * 100, 0)),
views: min(100, max(last? last.views + (random() - 0.5) * 10 : random() * 100, 0)),
veins: min(100, max(last? last.veins + (random() - 0.5) * 20 : random() * 100, 0))
});
last = data[data.length -1];
return data;
};
})();
var group = false,
groupOp = [{
dateFormat: 'M d',
groupBy: 'year,month,day'
}, {
dateFormat: 'M',
groupBy: 'year,month'
}];
function regroup() {
group = !group;
var axis = chart.axes.get(1),
selectedGroup = groupOp[+group];
axis.dateFormat = selectedGroup.dateFormat;
axis.groupBy = selectedGroup.groupBy;
chart.redraw();
}
var store = Ext.create('Ext.data.JsonStore', {
fields: ['date', 'visits', 'views', 'veins'],
data: generateData()
});
var intr = setInterval(function() {
var gs = generateData();
var toDate = timeAxis.toDate,
lastDate = gs[gs.length - 1].date,
markerIndex = chart.markerIndex || 0;
if (+toDate < +lastDate) {
markerIndex = 1;
timeAxis.toDate = lastDate;
timeAxis.fromDate = Ext.Date.add(Ext.Date.clone(timeAxis.fromDate), Ext.Date.DAY, 1);
chart.markerIndex = markerIndex;
}
store.loadData(gs);
}, 100);
Ext.create('Ext.Window', {
width: 800,
height: 600,
minHeight: 400,
minWidth: 550,
maximizable: true,
title: 'Live Updated Chart',
layout: 'fit',
items: [{
xtype: 'chart',
style: 'background:#fff',
store: store,
id: 'chartCmp',
axes: [{
type: 'Numeric',
grid: true,
minimum: 0,
maximum: 100,
position: 'left',
fields: ['views', 'visits', 'veins'],
title: 'Number of Hits',
grid: {
odd: {
fill: '#dedede',
stroke: '#ddd',
'stroke-width': 0.5
}
}
}, {
type: 'Time',
position: 'bottom',
fields: 'date',
title: 'Day',
dateFormat: 'M d',
groupBy: 'year,month,day',
aggregateOp: 'sum',
constrain: true,
fromDate: new Date(2011, 1, 1),
toDate: new Date(2011, 1, 7)
}],
series: [{
type: 'line',
axis: ['left', 'bottom'],
xField: 'date',
yField: 'visits',
label: {
display: 'none',
field: 'visits',
renderer: function(v) { return v >> 0; },
'text-anchor': 'middle'
},
markerConfig: {
radius: 5,
size: 5
}
},{
type: 'line',
axis: ['left', 'bottom'],
xField: 'date',
yField: 'views',
label: {
display: 'none',
field: 'visits',
renderer: function(v) { return v >> 0; },
'text-anchor': 'middle'
},
markerConfig: {
radius: 5,
size: 5
}
},{
type: 'line',
axis: ['left', 'bottom'],
xField: 'date',
yField: 'veins',
label: {
display: 'none',
field: 'visits',
renderer: function(v) { return v >> 0; },
'text-anchor': 'middle'
},
markerConfig: {
radius: 5,
size: 5
}
}]
}]
}).show();
chart = Ext.getCmp('chartCmp');
var timeAxis = chart.axes.get(1);
});