setAttribute在JavaScript中不起作用 [英] setAttribute is not working in JavaScript

问题描述

我使用 setAttribue 如下。它的工作只是第一次，之后改变的值显示警报，但没有用 document.getElementById（to）设置。setAttribute value，selValue）;

  document.getElementById（listcontact）。onchange = function （）{
 var selIndex = document.getElementById（listcontact）。selectedIndex; 
 var selValue = document.getElementById（listcontact）。options [selIndex] .innerHTML; 
 var contactVal = selValue.split（';'）; 
 var phone = contactVal [2]; 
 
 alert（phone）; 
 document.getElementById（to）。setAttribute（value，selValue）; 
 selIndex =; 
 selValue =; 
 phone =; 
 selValue =; 
}; 
  

为什么这不像我期望的那样工作，我该如何解决它？

解决方案

值属性设置初始值值， em> current value。

为值属性指派一些东西。

  document.getElementById（to）。value = selValue; 
  

I am using setAttribue as below. Its working only for first time and after that the changing value is showing the alert but not setting with document.getElementById("to").setAttribute("value", selValue);

document.getElementById("listcontact").onchange = function () {
    var selIndex = document.getElementById("listcontact").selectedIndex;
    var selValue = document.getElementById("listcontact").options[selIndex].innerHTML;
    var contactVal = selValue.split(';');      
    var phone = contactVal[2];  

    alert(phone);
    document.getElementById("to").setAttribute("value", selValue);
    selIndex = "";
    selValue = "";
    phone = "";
    selValue = "";
};

Why is this not working as I expect and how can I fix it?

解决方案

The value attribute sets the initial value, not the current value.

Assign something to the value property instead.

document.getElementById("to").value = selValue;

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