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首页 / 脚本样式 / JavaScript / javascript新建标签,判断键盘输入,以及判断焦点(示例代码)

如下所示:
复制代码 代码如下:
function saomiao(event,n)
{
     var code=0;
     code=event.keyCode;//监听键盘输入事件
     if(code=="13")//如果键盘输入回车键
     {
          if(n>0)//开始判断参数
          {
               if(document.getElementById("logisticsno").value=="")
          {
           alert("请扫描输入运单号!");
                     var r=document.getElementById("logisticsno");
                     r.focus();
           return false;
                   }
             else if(document.activeElement.name!="deliver_money")//document.activeElement.name焦点所在的元素名
             {
                     var r=document.getElementById("deliver_money");
                     r.focus();       
               }
             else//如果所有条件都满足
             {
                 var r=document.getElementById("logisticsno");
                     r.focus();
                     var f=document.createElement("form");//开始新建表单
                     f.action="/modules/logistics/start.php";
                     document.body.appendChild(f);//添加至body

                     var e=document.createElement("input");//新建表单元素
                     e.type="hidden";
                     e.name="act";
                     e.id="act";
                     e.value="logisticsno";
                     f.appendChild(e);//添加至表单

                     var data_id=0;
                     var g=document.getElementsByName("orderdataid_no[]");
                     var h=0;
                     for(var h=0;h<g.length;h++)
                     {
                      data_id=g[h].value;
                          }

                     var order_no=0;
                     var gg=document.getElementsByName("order_no[]");
                     var hh=0;
                     for(var hh=0;hh<gg.length;hh++)
                     {
                      order_no=gg[hh].value;
                     }

                     var k=document.createElement("input");
                     k.type="hidden";
                     k.name="order_no";
                     k.id="order_no";
                     k.value=order_no;
                     f.appendChild(k);

                     f.submit();//表单提交
                   }  
               }   
      }
     }
<body onKeyPress="javascript:saomiao(event,555);">//开始监控键盘输入