Application for Web-IO Analog-In:
Measured value meter (amperes)
More links
The value measured by the Web-IO Analog can be simply visualized on a Web page using JavaScript and a few images. Incorporation of the Web-IO applet provides for continuous updating of the display.Using the following copy&paste example you can represent a current value measured by your Web-IO Analog on a Web page. You will also find corresponding sample Web pages and images for displaying a voltage value as well as displaying two measured values (volts and amps).
Preparation
You have already provided your Web-IO Analog- with power,
- connected it to your network,
- assigned it an IP address - which with WuTility is no problem.
1. Incorporate JavaScript into the Web page
Copy the JavaScript (shown in blue)
to the <head> area of your Web page.
<html>
<head>
<title>Zeiger</title>
<script language="JavaScript" type="text/javascript">
<!--
var amperemeter = new multipic(101,"ampere_400_","gif",20,10,10,"showampere");
var valueampere;
function multipic(id, img_name, img_ext, img_count, ypos, xpos, link)
{
img_count++;
this.multipics = new Array( img_count );
this.multipic_count = img_count;
this.multipic_id = id; // class variables
for (i=0; i<img_count; i++)
{
this.multipics[i] = new Image();
this.multipics[i].src = img_name+i+’.’+img_ext;
}
this.Set = picSet; // class method
if (link == "nolink")
{
document.write("<img id=’"+this.multipic_id+"’ style=position:absolute;top:"+ypos+"px;left:"+xpos+"px src="+this.multipics[0].src+" border=0>");
}
else
{
document.write("<a href=’javascript:" + link + "(" + id + ");’><img id=’"+this.multipic_id+"’ style=position:absolute;top:"+ypos+"px;left:"+xpos+"px src="+this.multipics[0].src+" border=0></a>");
}
}
function picSet(iCount)
{
for (i=0; i<this.multipic_count; i++)
{
if(iCount==i)
{
document.getElementById(this.multipic_id).src = this.multipics[i].src;
}
}
}
function showampere()
{
alert("Aktueller Wert: "+valueampere+"mA");
}
function sensorChanged( iDevice, iSensor, iVal )
{
if (iSensor==1)
{
valueampere = iVal;
amperemeter.Set(Math.round(iVal*2));
}
}
</script>
</head>
...2. Incorporate applet into Web page
- Copy the applet data (in blue) to the <body> area of your Web page.
- Insert the IP address of your Web-IO Analog.
...
<body>
<applet name="Analog" archive="A.jar" code="A.class" codebase="http://10.40.22.27" height="0" width="0" mayscript>
<param name="device" value="0">
<param name="showerrors" value="off">
<param name="sensorpolling" value="on">
<param name="pollingrate" value="500">Java ist nicht aktiviert oder wird nicht unterstützt
</applet>
</body>
</html>3. Download and store images
Now all you need is the images associated with the display object, which we have provided here for downloading: .zip (approx. 298 kB). Please place the images in the directory in which the Web page with the JavaScript and applet data are located.