如何将 jQuery FLOT Graph 保存为 .png 或其他图像格式? [英] How to save a jQuery FLOT Graph to a .png or other image format?
本文介绍了如何将 jQuery FLOT Graph 保存为 .png 或其他图像格式?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用一个名为 FLOT 的 Jquery 插件 http://code.google.com/p/flot/
I'm using a plugin for Jquery called FLOT http://code.google.com/p/flot/
图形呈现后，我希望客户端能够将图形保存到文件中以备后用.关于如何在不需要客户端下载某些工具或图像捕获设备的情况下完成此操作的任何想法?
Once the graph is rendered I want the client to be able to save the graph to a file for later. Any idea on how this can be done without requiring the client to download some tool or image capture device?
<!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>
推荐答案
基本的方法是使用 canvas.toDataURL("image/png"); 但我也找到了这个链接你
The basic way to do it is using canvas.toDataURL("image/png"); but I also found this link for you
http://nihilogic.dk/labs/canvas2image/
我没有测试过.
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