我已经开始使用JQPlot实时绘制图形。我有一个示例示例,它将仅使用两个数据绘制图形 -
var storedData = [70, 10];
然后我添加了一个按钮,如果我点击该按钮,它将开始渲染更多数据。基本上,你可以说就像来自服务器的实时数据 -
但我目前面临的问题是,只要我点击Start Updates
按钮,它就不会画任何东西。所以我相信,我搞砸了按钮点击的东西。我花了很长时间研究Javascript和HTML的东西,所以我忘了很多东西。
以下是我的代码 -
<!DOCTYPE html>
<html>
<head>
<title>Line Charts and Options</title>
<link class="include" rel="stylesheet" type="text/css" href="../jquery.jqplot.min.css" />
<link rel="stylesheet" type="text/css" href="examples.min.css" />
<link type="text/css" rel="stylesheet" href="syntaxhighlighter/styles/shCoreDefault.min.css" />
<link type="text/css" rel="stylesheet" href="syntaxhighlighter/styles/shThemejqPlot.min.css" />
<!--[if lt IE 9]><script language="javascript" type="text/javascript" src="../excanvas.js"></script><![endif]-->
<script class="include" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
</head>
<body>
<div class="colmask leftmenu">
<div class="colleft">
<div class="col1" id="example-content">
<div id="chart1" style="height: 300px; width: 500px; position: relative;"></div>
<button>Start Updates</button>
<script class="code" type="text/javascript">
$(document).ready(function(){
var storedData = [70, 10];
var plot1;
renderGraph();
$('button').click( function(){
doUpdate();
$(this).hide();
});
function renderGraph() {
if (plot1) {
plot1.destroy();
}
plot1 = $.jqplot('chart1', [storedData]);
}
var newData = [9, 1, 4, 6, 8, 2, 5];
function doUpdate() {
if (newData.length) {
var val = newData.shift();
$.post('/echo/html/', {
html: val
}, function(response) {
var newVal = new Number(response); /* update storedData array*/
storedData.push(newVal);
renderGraph();
log('New Value '+ newVal+' added')
setTimeout(doUpdate, 3000)
})
} else {
log("All Done")
}
}
function log(msg) {
$('body').append('<div>'+msg+'</div>')
}
});
</script>
<script class="include" type="text/javascript" src="../jquery.jqplot.min.js"></script>
<script type="text/javascript" src="syntaxhighlighter/scripts/shCore.min.js"></script>
<script type="text/javascript" src="syntaxhighlighter/scripts/shBrushJScript.min.js"></script>
<script type="text/javascript" src="syntaxhighlighter/scripts/shBrushXml.min.js"></script>
<script class="include" type="text/javascript" src="../plugins/jqplot.canvasTextRenderer.min.js"></script>
<script class="include" type="text/javascript" src="../plugins/jqplot.canvasAxisLabelRenderer.min.js"></script>
</body>
</html>
我无法使按钮点击事件有效。一旦我点击Start Update
按钮,它就不会绘制任何内容。正确的行为应该是它应该开始使用新数据集在图表上渲染。
我试图通过此jsfiddle
使实时渲染功能正常工作我在我的HTML中从上面的JSFiddle中复制了相同的一堆代码,但它对我不起作用。有人可以帮我吗?
答案 0 :(得分:1)
在这里 - 你必须更新脚本标签中的jqplot位置。此外,我必须将doUpdate更改为doUpdate2,因为$ .post在没有jfiddle的情况下无法工作。
<!DOCTYPE html>
<html>
<head>
<title>Line Charts and Options</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript" src="jqplot/jquery.jqplot.min.js"></script>
<script type="text/javascript" src="jqplot/plugins/jqplot.canvasAxisTickRenderer.min.js"></script>
<script type="text/javascript" src="jqplot/plugins/jqplot.canvasTextRenderer.min.js"></script>
<script type="text/javascript" src="jqplot/plugins/jqplot.canvasAxisLabelRenderer.min.js"></script>
<script type="text/javascript" src="jqplot/plugins/jqplot.cursor.min.js"></script>
<script type="text/javascript" src="jqplot/plugins/jqplot.pointLabels.min.js"></script>
<script type="text/javascript" src="jqplot/plugins/jqplot.highlighter.min.js"></script>
<script type="text/javascript">
$(function(){
/* store empty array or array of original data to plot on page load */
var storedData = [70, 10];
/* initialize plot*/
var plot1;
renderGraph();
$('button').click( function(){
doUpdate2();
$(this).hide();
});
function renderGraph() {
if (plot1) {
plot1.destroy();
}
plot1 = $.jqplot('chart1', [storedData]);
}
var newData = [9, 1, 4, 6, 8, 2, 5];
var cp = 0;
function doUpdate2() {
var newVal = new Number(newData[cp]); /* update storedData array*/
storedData.push(newVal);
renderGraph();
log('New Value '+ newVal+' added')
if (cp < newData.length-1) setTimeout(doUpdate2, 3000)
cp++;
}
function doUpdate() {
if (newData.length) {
var val = newData.shift();
$.post('/echo/html/', {
html: val
}, function(response) {
var newVal = new Number(response); /* update storedData array*/
storedData.push(newVal);
renderGraph();
log('New Value '+ newVal+' added')
setTimeout(doUpdate, 3000)
})
} else {
log("All Done")
}
}
function log(msg) {
$('body').append('<div>'+msg+'</div>')
}
});
</script>
</head>
<body>
<div id="chart1" style="height: 300px; width: 500px; position: relative;"></div>
<button>Start Updates</button>
</body>
</html>