I am currently experimenting with implementing the highcharts speedometer. The goal is to simulate a connection meter - when there is a good connection, the meter should display values between 30 and 100. If the connection result from an Ajax call is anything other than 4 or 200, it should drop to zero. I have the function set up, and it works fine when the server is running. However, when I turn off Apache, it does not reset to zero as expected. I have tried various approaches to troubleshoot the issue in the code, but nothing seems to work. Even setting the chart point to zero manually did not achieve the desired result. Any suggestions on how to fix this would be greatly appreciated. It would be great to wrap this up soon so that I can use it for work after making some adjustments.
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" >
<title>Sales Meter</title>
<script type="text/javascript" src="jquery-1.8.2.min.js"></script>
<script type="text/javascript">
var flag;
var xmlhttp;
var url="http://192.168.0.5/ajax_info.txt"+'?_dc='+(new Date()).getTime();
//ajax call
function loadXMLDoc(url, cfunc){
if(window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else {
xmlhttp=new ActiveObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=cfunc;
xmlhttp.open("GET",url, true);
xmlhttp.send();
}
function myFunction(){
loadXMLDoc(url, function(){
if(xmlhttp.readyState==4 && xmlhttp.status==200){
flag = 1;
}
});
}
$(function () {
var chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
type: 'gauge',
plotBackgroundColor: null,
plotBackgroundImage: null,
plotBorderWidth: 0,
plotShadow: false
},
title: {
text: 'Sales-O-Meter'
},
pane: {
startAngle: -150,
endAngle: 150,
background: [{
backgroundColor: {
linearGradient: { x1: 0, y1: 0, x2: 0, y2: 1 },
stops: [
[0, '#FFF'],
[1, '#333']
]
},
borderWidth: 0,
outerRadius: '109%'
}, {
backgroundColor: {
linearGradient: { x1: 0, y1: 0, x2: 0, y2: 1 },
stops: [
[0, '#333'],
[1, '#FFF']
]
},
borderWidth: 1,
outerRadius: '107%'
}, {
// default background
}, {
backgroundColor: '#DDD',
borderWidth: 0,
outerRadius: '105%',
innerRadius: '103%'
}]
},
// the value axis
yAxis: {
min: 0,
max: 100,
minorTickInterval: 'auto',
minorTickWidth: 1,
minorTickLength: 2.5,
minorTickPosition: 'inside',
minorTickColor: '#666',
tickPixelInterval: 15,
tickWidth: 1,
tickPosition: 'inside',
tickLength: 5,
tickColor: '#666',
labels: {
step: 5,
rotation: 'auto'
},
title: {
text: 'sales/min'
},
plotBands: [{
from: 0,
to: 10,
color: '#DF5353'
}, {
from: 10,
to: 20,
color: '#DDDF0D'
}, {
from:20,
to: 100,
color: '#55BF3B'
}]
},
series: [{
name: 'Speed',
data: [80],
tooltip: {
valueSuffix: ' sales/sec'
}
}]
},
// Add some life
function (chart) {
flag = 0;
myFunction();
setInterval(function () {
if(flag==1){
var point = chart.series[0].points[0],
newVal,
inc = Math.round((Math.random() - .5) * 20);
newVal = point.y + inc;
if (newVal < 0 || newVal > 100) {
newVal = point.y - inc;
}
point.update(newVal);
}
else{
var point = chart.series[0].points[0],
newVal = 0,
inc = 0;
point.update(newVal);
}
}, 1000);
});
});
</script>
</head>
<body>
<script src="highcharts.js"></script>
<script src="highcharts-more.js"></script>
<div id="container" style="width: 500px; height: 400px; margin: 0 auto"></div>
</body>
</html>