Absolute position of the image object in px from the upper and left window edge.
Time in ms within which the applet updates the measured value; adjust as needed.
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 (Model 57421, 57642 or 57643) on a Web page in the form of a digital display. You can also find a corresponding sample Web page for displaying two measured values.
Preparations
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 gray) from the following example to the <head> area of your Web page.
<html>
<head>
<title>Digitale Anzeige</title>
<script language="JavaScript" type="text/javascript">
<!--
var valuevolt;
voltdigit = new Array(5);
document.write("<img border='0' src='display_400.gif' style='position:absolute; top:10px; left:10px'>");
document.write("<img border='0' src='dot_400.gif' style='position:absolute; top:37px; left:180px'>");
voltdigit[0] = new multipic(201,"digit_400_","gif",9,37,80,"nolink");
voltdigit[1] = new multipic(202,"digit_400_","gif",9,37,130,"nolink");
voltdigit[2] = new multipic(203,"digit_400_","gif",9,37,190,"nolink");
voltdigit[3] = new multipic(204,"digit_400_","gif",9,37,240,"nolink");
voltdigit[4] = new multipic(205,"digit_400_","gif",9,37,290,"nolink");
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 sensorChanged( iDevice, iSensor, iVal )
{ var maxdigits = 5;
var i=maxdigits;
var digitvalue;
if (iSensor==1)
{ valuevolt = iVal;
iVal=valuevolt*1000
do
{ i--
digitvalue = parseInt(iVal/Math.pow(10,i));
voltdigit[maxdigits-1-i].Set(digitvalue);
iVal=iVal-digitvalue*Math.pow(10,i);
}
while(i>0)
}
}
</script>
</head>
...
2. Incorporate applet into Web page
Copy the applet data (in gray) 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. 21 kB). Please place the images in the directory in which the Web page with the JavaScript and applet data are located.
