document.getElementById（）通过分配动态变量 [英] document.getElementById() by assigning the dynamic variable

问题描述

我使用该表的td中的输入字段的id在html表中动态创建行。
table正确创建新添加的行和输入框id也创建。但是当我尝试使用id获取该输入框时，它会抛出空异常。

  var cell1 = row.insertCell（1）; 
 var element1 = document.createElement（input）; 
 element1.name = rId +_+ rowCount +_newscheduledate; 
 element1.id = rId +_+ rowCount +_newschedueldate; 
 cell1.appendChild（element1）; 
 
 alert（rowCount +：+ rId）; //这里alert提示值
 var tt = document.getElementById（rId +'_'+ rowCount +'_newscheduledate'）; 
 alert（tt）; // here null 
  

例外情况如下

 错误：document.getElementById（rId +（_+ rowCount +_newscheduledate））为空
 
 
 >  element1.id = rId +_+ rowCount +_newschedueldate; 
  
至
  element1.id = rId +_+ rowCount +_newscheduledate; 
  
 
am creating the row dynamically in html table using id of input field in td of that table.
table created properly with newly added rows and input box ids also created.but when I try to get that input box using id it throws null exception.
var cell1 = row.insertCell(1);
var element1 = document.createElement("input");
    element1.name = rId + "_" + rowCount + "_newscheduledate";
    element1.id = rId + "_" + rowCount + "_newschedueldate";
    cell1.appendChild(element1);

     alert(rowCount+"  : "+rId);  //here alert shows the values
     var tt = document.getElementById(rId + '_' + rowCount + '_newscheduledate');
     alert(tt); // here null comes
Exception comes like this 
Error: document.getElementById(rId + ("_" + rowCount + "_newscheduledate")) is null

解决方案
Change:-
element1.id = rId + "_" + rowCount + "_newschedueldate";
To 
element1.id = rId + "_" + rowCount + "_newscheduledate";


                        
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