下面通过实例代码给大家介绍js扫码枪扫描条形码的实现方法,具体代码如下所示:
var keycode = "";
var lastTime=null,nextTime;
var lastCode=null,nextCode;
document.οnkeydοwn=function(e){
if(window.event){
// IE
nextCode = e.keyCode
} else if(e.which){
// Netscape/Firefox/Opera
nextCode = e.which
}
//+键,增加新数据行
if(nextCode==107 || nextCode==187){
addNewGoodLine();
}
//-键,删除最后一条数据行
else if(nextCode==109 || nextCode==189){
$(".new_products:last").remove();
}
//字母上方 数字键0-9 对应键码值 48-57
//数字键盘 数字键0-9 对应键码值 96-105
else if((nextCode>=48&&nextCode<=57) || (nextCode>=96&&nextCode<=105)){
//数字键盘的键码值对应的字符有问题,所以手动调整键码值
var codes = {'48':48,'49':49,'50':50,'51':51,'52':52,'53':53,'54':54,'55':55,'56':56,'57':57,
'96':48,'97':49,'98':50,'99':51,'100':52,'101':53,'102':54,'103':55,'104':56,'105':57
};
nextCode = codes[nextCode];
nextTime = new Date().getTime();
if(lastCode == null && lastTime == null) {
keycode = String.fromCharCode(nextCode);
} else if(lastCode != null && lastTime != null && nextTime - lastTime <= 30) {
keycode += String.fromCharCode(nextCode);
} else{
keycode = "";
lastCode = null;
lastTime = null;
}
lastCode = nextCode;
lastTime = nextTime;
}
//13 为按键Enter
else if(nextCode==13 && keycode!= ""){
var code = $(".new_products:last .code").val();
if(code != ""){
//最后一行已录入数据,重新生成新行
addNewGoodLine();
}
$(".new_products:last .code").val(keycode).blur();
keycode = "";
lastCode = null;
lastTime = null;
}
}
function addNewGoodLine(){
//生成新数据行
var html = '
';html += '
';html += '
';html += '';
html += '
';html += '
';}
function getProductDetail(){
//获取商品的详细信息,然后赋值
}
思路:
1.注册onkeydown事件,捕获数字键的按下事件
2.计算按下数字键的时间间隔,若间隔小于30毫秒,则为扫码枪输入
3.捕获Enter案件的按下事件,判断捕获的扫码枪输入数值是否为空,不为空,对相应的文本框赋值,同时触发按找条形码查找商品的方法
总结
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