将带有ASCII控制字符的条形码扫描到输入字段中 [英] Scanning a barcode with an ASCII control character into an input field

问题描述

我需要使用 ASCII 29（分组分隔符）扫描条形码到HTML输入字段，并用|替换所有组分隔符。当我第一次扫描条形码到 Notepad ++ 时，下列JavaScript函数可以工作，然后复制它到输入字段，而不是当条形码直接扫描到输入字段时。问题是什么？

  var barcode = document.getElementById（'barcode'）。value; 
 barcode = barcode.replace（new RegExp（String.fromCharCode（29），'g'），'|'）; 
 alert（barcode）;在我的Symbol Tech条形码扫描仪上，字符被发送为：击键。例如，组分隔符将模拟按住left_control键然后发送右括号。您的浏览器将处理模拟的按键，就好像您尝试使用 CTRL  + ] 作为快捷方式一样。 
 
 
您可以使用 onkeydown 和event.of来捕获此事件，如下所述：
  Firefox onkeydown检测按键 
 
I need to scan a barcode with ASCII 29 (group separator) into an HTML input field, and replace all the group separators with |. The following JavaScript function works when I first scan the barcode into Notepad++ and then copy it to the input field, but not when the barcode is scanned directly into the input field. What's the problem?
var barcode = document.getElementById('barcode').value;
barcode = barcode.replace(new RegExp(String.fromCharCode(29), 'g'), '|');
alert(barcode);

解决方案
On my Symbol Tech barcode scanner, characters are sent as key strokes. For example, the group separator will emulate holding down the left_control key and then sending a right bracket. Your browser will handle the simulated key strokes as if you were trying to use CTRL+] as a shortcut.

You can capture this event with onkeydown and event.which as described here:
Firefox onkeydown detect pressed key

                        
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