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本文實例講述了Ajax+Jpgraph實現的動態折線圖功能。分享給大家供大家參考，具體如下：

一代碼

fun.js：

var i=1;
function progress(){
  setInterval("beginProgress()", 600);
}
function beginProgress(){
 $("#img").attr("src", "img.php?m="+i);
 i++;
 if(i>=12){
   i=1;
 }
}

index.php：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Ajax+Jpgraph制作動態折線圖</title>
</head>
<script language="javascript" src="js/jquery-1.3.2.js"></script>
<script language="javascript" src="js/fun.js"></script>
<body>
  <img id="img" src="img.php?m=0" />
 <br>
 <input type="button" value="開始" onclick="progress()"/>
</body>
</html>

img.php：

<?php
require_once 'src/jpgraph.php';   //導入Jpgraph類庫
require_once 'src/jpgraph_line.php';   //導入Jpgraph類庫的柱狀圖功能
$dataTmp = array(56, 78, 34, 65, 89, 24 ,67 ,88, 45, 68, 70, 50);   //設置統計數據
$data1 = array(0, 0, 0, 0, 0, 0 ,0 ,0, 0, 0, 0, 0);   //設置統計數據
$m = $_GET['m'];
for($i=0; $i<$m; $i++){
  $data1[$i] = $dataTmp[$i];
}
$graph = new Graph(500, 320);
$graph->SetScale("textlin");
$graph->SetShadow();
$graph->img->SetMargin(40, 30, 30, 70);
$graph->title->Set("圖書銷售走勢表");
$lineplot1 = new LinePlot($data1);
$graph->Add($lineplot1);
$graph->xaxis->title->Set("月份");
$graph->yaxis->title->Set("book A銷售金額（萬元）");
$graph->title->SetFont(FF_SIMSUN, FS_BOLD);
$graph->yaxis->title->SetFont(FF_SIMSUN, FS_BOLD);
$graph->xaxis->title->SetFont(FF_SIMSUN, FS_BOLD);
$lineplot1->SetColor('red');
$lineplot1->SetLegend('book A');
$graph->legend->SetLayout(LEGEND_HOR);
$graph->legend->Pos(0.4, 0.95, 'center', 'bottom');
$graph->Stroke();

二運行結果