检查cookie是否仍然有效

问题描述

在我们的内联网中，每个用户都可以登录并在用户成功连接时创建cookie

In our intranet, each user can log in and cookies are created when the user is sucessfully connected

setcookie('id_user', $res['id_user'], time()+600, '/');
setcookie('email', $res['mail'], time()+600, '/');
setcookie('firstname', $res['firstname'], time()+600, '/');
setcookie('lastname', $res['name'], time()+600, '/');

他们将在10分钟后过期。

They will expire after 10 min.

我有很多页面，其中js函数使用 $ _ COOKIE 变量。
我不想检查每个函数 $ _ COOKIE 是否为空。

I have many pages where js function are using the $_COOKIE variables.I do not want to check if $_COOKIE is null or not for every function.

是有没有办法触发js函数检查cookie是否仍然可用？

Is there a way to trigger a js function to check if the cookie is still available ?

我试过这个

var user = '<?php echo $_COOKIE['id_user']; ?>';

function check()
{
    if(user === null)
    {
        console.log('logged');
    }
    else
    {
        console.log('disconnected');
    }
}

check();
setInterval(check, 1000);

但它没有用。在访问此页面之前我已连接。即使我断开与其他页面的连接，控制台也始终显示已连接。我认为cookie仍然存在于页面中并且没有过期。

But it did not worked. When I'm connected before accessing to this page. The console is always showing 'connected' even when I disconnect from another page. I think the cookie is still present in the page and did not expire.

如果我在访问页面之前没有连接，则js错误告诉我

And if I am not connected before accessing the page, an js error tell me

SyntaxError: unterminated string literal


var user = '<br />

推荐答案

我使用以下js管理了这个。如果cookie仍然可用，此代码将每秒检查一次。

I managed this using the following js. This code will check every sec if the cookie is still available.

function check()
{
    var user = getCookie('firstname');

    if(user == '')
    {
        console.log('disconnected');
    }
    else
    {
        console.log('connected');
    }
}

function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(name) == 0) return c.substring(name.length,c.length);
    }
    return "";
}

check();
setInterval(check, 1000);

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