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Sto usando un plugin per jQuery chiamati FLOT http://code.google.com/p/flot/Come salvare un grafico FLOT jQuery su un formato .png o altro?
Una volta che il grafico è reso Voglio che il cliente sia in grado di salvare il grafico in un file per più tardi. Qualche idea su come questo può essere fatto senza richiedere al client di scaricare qualche strumento o dispositivo di acquisizione di immagini?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html lang="en">
<head>
<!--[if IE]><script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Graph</title>
<link href="layout.css" rel="stylesheet" type="text/css"></link>
<!--[if IE]><script language="javascript" type="text/javascript" src="lib/flot/excanvas.min.js"></script><![endif]-->
<script language="javascript" type="text/javascript" src="lib/canvas2image/base64.js"></script>
<script language="javascript" type="text/javascript" src="lib/canvas2image/canvas2image.js"></script>
<script language="javascript" type="text/javascript" src="lib/flot/jquery.js"></script>
<script language="javascript" type="text/javascript" src="lib/gChart/jquery.gchart.js"></script>
<script language="javascript" type="text/javascript" src="lib/flot/jquery.flot.js"></script>
<script language="javascript" type="text/javascript" src="lib/flot/jquery.flot.selection.js"></script>
<script language="javascript" type="text/javascript" src="lib/flot/jquery.flot.crosshair.js"></script>
<script language="javascript" type="text/javascript" src="lib/flot/jquery.flot.navigate.js"></script>
<style>
</style>
</head>
<body>
<div id="placeholder" style="width:1000px;height:400px;"></div>
<div id="test" style="display: none; background: #ff0; padding: 5px; border: 1px solid #ddd; position: absolute;"></div>
<script type="text/javascript">
$(function() {
var options0 = {
xaxis: {mode: "time"},
legend: {position: "nw"},
lines: {show: true},
grid: {hoverable: true}};
var grid_data0 = [[new Date(1286172000 * 1000), 1219], [new Date(1286258400 * 1000), 1583], [new Date(1286344800 * 1000), 1566], [new Date(1286431200 * 1000), 2191], [new Date(1286517600 * 1000), 2471], [new Date(1286604000 * 1000), 3128], [new Date(1286690400 * 1000), 2713], [new Date(1286776800 * 1000), 2117], [new Date(1286863200 * 1000), 3174], [new Date(1286949600 * 1000), 3051], [new Date(1287036000 * 1000), 3582], [new Date(1287122400 * 1000), 3472], [new Date(1287208800 * 1000), 3928], [new Date(1287295200 * 1000), 3688], [new Date(1287381600 * 1000), 2547], [new Date(1287468000 * 1000), 1549], [new Date(1287554400 * 1000), 3008], [new Date(1287640800 * 1000), 2309], [new Date(1287727200 * 1000), 2973], [new Date(1287813600 * 1000), 3805], [new Date(1287900000 * 1000), 3643], [new Date(1287986400 * 1000), 2310], [new Date(1288072800 * 1000), 2323], [new Date(1288159200 * 1000), 2399], [new Date(1288245600 * 1000), 2305], [new Date(1288332000 * 1000), 2393], [new Date(1288418400 * 1000), 3212], [new Date(1288504800 * 1000), 3348], [new Date(1288591200 * 1000), 2391], [new Date(1288677600 * 1000), 2130], [new Date(1288764000 * 1000), 1896], [new Date(1288850400 * 1000), 1765], [new Date(1288936800 * 1000), 2191], [new Date(1289023200 * 1000), 3008], [new Date(1289109600 * 1000), 3085], [new Date(1289199600 * 1000), 2151], [new Date(1289286000 * 1000), 2011], [new Date(1289372400 * 1000), 2016], [new Date(1289458800 * 1000), 1914]];
var plot = $.plot($("#placeholder"), [{data: grid_data0}, ], options0);
});
$("#placeholder").mouseout(function(e){
$("#test").hide();
});
function test() {
//var oCanvas = $("#placeholder");//document.getElementById("placeholder");
//img=document.createElement("img");
//Save
//img.src=oCanvas.toDataUrl();
//Restore
//oCanvas.drawImage(img, 0, 0);
//var oCanvas = $("#placeholder");//document.getElementById("placeholder");
//document.write(document.getElementById('placeholder').toDataUrl());
Canvas2Image.saveAsPNG(document.getElementById('placeholder'));
//Canvas2Image.saveAsPNG(oCanvas, true);
}
</script>
<a onClick="JavaScript:test();">Click</a>
</body>
</html>
Ottengo qualche errore "oScaledCanvas.toDataURL non è una funzione" quando provo a eseguirlo. Inoltre sembra funzionare solo in nessuno browser IE. (Sto usando FireFox, tuttavia, il client potrebbe utilizzare IE). – Josh
Avrai molta cura nel supportare canvas in IE. (ricorda, ti avevo avvertito.) – Hogan
toDataURL fa parte di HTML5: http://www.w3.org/TR/html5/the-canvas-element.html – Hogan