使用 JavaScript 读取 cookie [英] Read cookies with JavaScript

问题描述

我知道如何在 JavaScript 中编写/创建 cookie ..........................................................

I know how to write/create cookies in JavaScript.........................................................

//Create the cookies
document.cookie = "Name=" + Name + ";expires=Friday, 31-Dec-2011 12:00:00 GMT; path=/";
document.cookie = "Surname=" + Surname + ";expires=Friday, 31-Dec-2011 12:00:00 GMT; path=/";
document.cookie = "Number=" + Number + ";expires=Friday, 31-Dec-2011 12:00:00 GMT; path=/";
document.cookie = "Email=" + Email + ";expires=Friday, 31-Dec-2011 12:00:00 GMT; path=/";
document.cookie = "Country=" + Country + ";expires=Friday, 31-Dec-2011 12:00:00 GMT; path=/";
document.cookie = "Company=" + Company + ";expires=Friday, 31-Dec-2011 12:00:00 GMT; path=/";
document.cookie = "Title=" + Job + ";expires=Friday, 31-Dec-2011 12:00:00 GMT; path=/";

但是我怎样才能在 JavaScript 中读取它们中的每一个，因为我想在用户下次访问表单时填充文本框?

But how can I read each one of them in JavaScript because I want to populate the text boxes next time the user come to the form?

我已经试过了，但它不起作用:

I have tried this but it does not work:

var cookieName = ReadCookie("Name");
document.getElementById('txtName').value = cookieName;

使用答案

我使用了这个代码......................................

I used this code....................................

<script type="text/javascript">

function getCookie(c_name)
{
  if (document.cookie.length>0)
  {
      c_start=document.cookie.indexOf(c_name + "=");
      if (c_start!=-1)
        {
        c_start=c_start + c_name.length+1;
        c_end=document.cookie.indexOf(";",c_start);
        if (c_end==-1) c_end=document.cookie.length;
        return unescape(document.cookie.substring(c_start,c_end));
        }
     }
     return "";
 }

function checkCookie()
{
    Name = getCookie('Name');
    Surname = getCookie('Surname');
    Email = getCookie('Email');
    Company = getCookie('Company');
    Title = getCookie('Title');

    if (Email!=null && Email!="")
      {
      //Populate the text boxes..................................
      document.FormName.txtName.value = Name;
      document.FormName.txtSurname.value = Surname;
      document.FormName.txtEmail.value = Email;
      document.FormName.txtCompany.value = Company;
      document.FormName.txtjob.value = Title;
      }
   }

</script>

并像这样从 window.onload 调用 checkCookie() 函数

And called the checkCookie() function like so from the window.onload

<SCRIPT TYPE='text/javascript' LANGUAGE='JavaScript'><!--    //

window.onload = initPage;

function initPage() 
{
    checkCookie();

}

//-->

享受！！

推荐答案

来自 http://w3schools.com/js/js_cookies.asp

设置cookie

function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+
((expiredays==null) ? "" : ";expires="+exdate.toUTCString());
}

获取cookie

function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    {
    c_start=c_start + c_name.length+1;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    }
  }
return "";
}

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