使用AJAX将变量javascript传递给PHP [英] Passing variable javascript to PHP using AJAX

问题描述

我正在尝试使用jQuery AJAX将单个变量从javascript传递到PHP.

I am trying to pass a single variable from javascript to PHP using jQuery AJAX.

JavaScript:

Javascript:

$(document).ready(function() {
    $('.ok').on('click', function(e){

        var value = 5;

        $.ajax({
            url: 'tabulka.php',
            type: "POST",
            data: {x : value},
            success: function(){
                alert(value);
            }
        });
    });
});

PHP:

if($_SERVER['REQUEST_METHOD']){
    $value = $_POST['x'];
    echo $value;
}

我从ajax获得了具有预期值的警报，但是在PHP中，我得到了以下错误:Notice: Undefined index: value in C:\xampp\htdocs\test\tabulka.php on line 71 当我取消注释dataType: 'json'时，我什至没有收到来自AJAX的警报.

I get the alert from ajax with the expected value but in PHP I get this error: Notice: Undefined index: value in C:\xampp\htdocs\test\tabulka.php on line 71 When I uncomment the dataType: 'json' I don't even get the alert from AJAX.

推荐答案

您的JavaScript

Your JavaScript

data: {'value' : value}

请注意单引号和没有括号

您的PHP:

If(isset($_POST['value'])){
   $val = $_POST['value'];
}

您的JavaScript格式错误. data是一个对象，或者换句话说，是一个关联数组.

Your JavaScript was formatted incorrectly. data is an object, or an associative array in other words.

您的PHP代码具有不必要的字符串比较.每当对PHP脚本发表文章时，您都将使用$ _POST数组访问它们.

Your PHP code has unnecessary string comparison. Whenever a post is made to a PHP script, you will access them using $_POST array.

例如，如果您是通过AJAX发布的

For instance, if you posted this via AJAX

data:{ 'name' : 'jake', 'age' : 1024}

您可以通过以下方式在PHP中访问它们

You would access them in PHP by

  $name = $_POST['name']
    $age = $_POST['age']

此外，明智的是使用PHP isset在尝试访问它们之前验证post变量是否存在.这样，如果期望的发布数据不存在，您将不会有异常.

Also, it is wise to use PHP isset to verify that a post variable exists before trying to access them. That way you will not have an exception if expected post data is not.

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