Look at the scanner jack.
If it looks like this:
, then it’s a keyboard wedge scanner. It acts like a keyboard: just types your barcode into an edit field.
If it looks like this:
, it’s a serial port scanner.
You need to create an instance of System.IO.Ports.SerialPort and use it to communicate with the scanner.
If it looks like this:
, it’s a USB scanner. From programmer’s point of view, it can be either a keyboard wedge or a serial port scanner.
Ours was wedge scanner. If we want to intercept the barcode input , for instance for validation or some logic decision where to show the input , then you should catch the Ctrl+b event , initialize a flag saying you’re now reading the barcode . On each KeyPress you’ll hit , if it’s not “Enter” (the end of Barcode input) and the flag of (Ctrl+b) (Start Barcode Read) is true , add each time add the value to some parameter. When the “Enter” comes you have all the bar code data in the parameter. :
1: var barcodeWorking = false;
2: var barcode = "";
3:
4: //This function fired when ctrl+b insert : begin reading with barcode
5: function FireEventB_KeyAndONE_Key()//Override the function of KeboardUse.js
6: {
7: barcodeWorking = true;
8: window.focus();//כדי שהברקוד לא יכתב לרכיב טקסט בדף
9: }
10:
11: function KeyPress(theKey)
12: {
13: var key=theKey.keyCode || theKey.which;
14: if(barcodeWorking)
15: {
16: if(key == ENTER_KEY)//'Enter' pressed : end of the barcode
17: {
18: alert(barcode); )//לעשות מה שצריך עם הברקוד
19: barcode = "";
20: barcodeWorking = false;
21: }
22: else
23: {
24: barcode += String.fromCharCode(key);
25: }
26: }
27: }
Don’t forget to connect the KeyPress to Body tag.
1: <body language="javascript" onload="windows_onload();" oncontextmenu='return false' onkeypress="KeyPress(event)">
The idea has been generated by me.
The source code (implementation) has been written by Sharon Said.
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