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Sunday, 14 April 2019 15:35

Measured value meter (amperes)

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Programming with JavaScript

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.

Read 7 times Last modified on Sunday, 14 April 2019 17:21

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