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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>
Paging using AJAX with refresh of Chart (Google Visualization API)
</title>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script type="text/javascript">
google.load('visualization', '1', {packages: ['table','barchart']});
</script>
<script type="text/javascript">
/**
* draw partly
*
* @param visualisation ob can be type of google.visualization.BarChart
* @param DataTable data the original full data
* @param DataTable datacopy a reference with existing columns and a fixed row length
* @param integer offset data offset
* @param integer limit data limit
*/
function drawPartly(ob, data, datacopy, offset, limit) {
var columns = data.getNumberOfColumns();
// reset the datacopy (important, if switching from empty to full page)
datacopy.removeRows(0,datacopy.getNumberOfRows());
for(var i=offset; i<offset+limit && i<data.getNumberOfRows(); i++) {
// insert new row
var k = datacopy.addRow();
// fill columns
for(var j=0; j<columns; j++) {
datacopy.setCell(k, j, data.getValue(i,j));
}
}
ob.draw(datacopy);
}
/**
* draws the visualization, called via google.setOnLoadCallback
*/
function drawVisualization() {
// how many items should be visible per page
var limit = 4;
// preload one more page
var firstload_entries = (limit*2);
// set the first two pages as preloaded (index is important)
var cachedpages = [1,1];
// Create and populate the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Item');
data.addColumn('number', 'Rating');
data.addColumn('boolean', 'Check');
// construct the (global) data copy
var datacopy = data.clone();
// the copy will never hold more entries than one page can display
datacopy.insertRows(0, limit);
// fill the first entries with sample data
data.addRows(firstload_entries);
for(var i=0; i<firstload_entries; i++) {
data.setCell(i, 0, 'Item '+i);
data.setCell(i, 1, i*i);
data.setCell(i, 2, true);
}
// Create and draw the visualization.
var visualization = new google.visualization.Table(document.getElementById('table'));
google.visualization.events.addListener(visualization, 'page', function(e) {
var next = e['page']+1;
// update the chart
drawPartly(chart, data, datacopy, e['page']*limit, limit);
// preload next page if now existing yet
if(typeof(cachedpages[next]) != 'undefined') return;
// load data via json
$.getJSON("status.php", {page:next, limit:limit}, function(jsondata){
// specify the index where rows should be inserted
data.insertRows(next*limit, limit);
// insert data
$.each(jsondata, function(i,item) {
for(var j=0; j<item.length; j++) {
data.setCell(parseInt(i), j, item[j]);
}
});
// redraw the current page (activates the next button)
visualization.draw(data, {page:'enable', pageSize: limit, startPage: e['page']});
// save as cached
cachedpages.push(1);
});
});
// Crate the visualization bar.
var chart = new google.visualization.BarChart(document.getElementById('chart'));
drawPartly(chart, data, datacopy, 0, limit);
visualization.draw(data, {page:'enable', pageSize: limit});
}
google.setOnLoadCallback(drawVisualization);
</script>
</head>
<body style="font-family: Arial;border: 0 none;">
<h1>Paging using AJAX with reloading of Chart</h1>
<h2>Google Visualization API</h2>
<p>Reloads additional data and appends it to the table</p>
<p>Updates two visualizations when using pagination.</p>
<a href="http://www.easy-coding.de">http://www.easy-coding.de</a>
<div id="table"></div>
<div id="chart" style="width:400px;height:200px"></div>
</body>
</html>
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