javascript - 如何将jQuery FLOT Graph保存为.png或其他图像格式？

我正在为Jquery使用名为FLOT http://code.google.com/p/flot/的插件

绘制图形后，我希望客户端能够将图形保存到文件中以备后用。在不要求客户端下载某些工具或图像捕获设备的情况下如何实现此想法？

<!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>

最佳答案

基本的方法是使用canvas.toDataURL("image/png");，但我也为您找到了此链接

http://nihilogic.dk/labs/canvas2image/

我还没有测试。

关于javascript - 如何将jQuery FLOT Graph保存为.png或其他图像格式？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4197468/

Flot

javascript - 如何将jQuery FLOT Graph保存为.png或其他图像格式？