使用/ JavaScript发送HTTP请求

时间:2014-10-29 03:30:17

标签: javascript php ajax http xmlhttprequest

所以我有一个像这样的JavaScript函数,

var ajax = function(data, url, method, onfinish){
    var xmlhttp=new XMLHttpRequest();
    xmlhttp.onreadystatechange=function()
    {
    if (xmlhttp.readyState==4 && xmlhttp.status==200)
        {
            onfinish(xmlhttp.responseText);
        }
    };
    xmlhttp.open(method, "pages/page.php?cv=1", true);
    xmlhttp.send("cv=1");
};

我有一个应该运行该函数的空链接

<a href="javascript:void(0)" onclick="ajax('cv=1', 'pages/page.php', 'POST', set)" class="link">Posts</a>

这是我的php文件,

<?php
$cv = $_POST["cv"];
if ($cv == "p1") {
    include("posts.php");
} else if ($cv == "p2") {
    include("users.php");
} else if ($cv == "p3") {
    include("write.php");
} else if ($cv == "p4") {
    include("signup.php");
}
?>

但我一直收到这个错误,

注意:第2行/home/cabox/workspace/pages/page.php中的未定义索引:cv

2 个答案:

答案 0 :(得分:0)

你可以这样:

 $cv =  isset($_POST['cv']) ? $_POST['cv'] : '';

我希望可以帮到你!

答案 1 :(得分:0)

如果您要使用POST,则需要添加:

xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

所以你的功能将是:

var xmlhttp = new XMLHttpRequest();
xmlhttp.open(method, url, true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

    }
}

xmlhttp.send(data);

然后在PHP中:

if(isset($_POST['cv'])) {
    $cv = $_POST["cv"]; 
    if ($cv == "1") {
        include("posts.php");
    } else if ($cv == "2") {
        include("users.php");
    } else if ($cv == "3") {
        include("write.php");
    } else if ($cv == "4") {
        include("signup.php");
    }
}