从 PHP 访问 JavaScript 变量 [英] Access a JavaScript variable from PHP

问题描述

我需要使用 PHP 访问 JavaScript 变量.这是我目前正在尝试的代码的精简版本，但它不起作用:

I need to access a JavaScript variable with PHP. Here's a stripped-down version of the code I'm currently trying, which isn't working:

<script type="text/javascript" charset="utf-8">
    var test = "tester";
</script>

<?php
    echo $_GET['test'];
?>

我是 JavaScript 和 PHP 的新手，所以我非常感谢您的建议.

I'm a completely new to both JavaScript and PHP, so I would really appreciate any advice.

UPDATE:好的，我想我把它简化了太多.我想要做的是创建一个表单，在提交时更新 Twitter 状态.我的表单工作正常，但我还想添加地理定位数据.由于我使用 Javascript(特别是 Google Geolocation API)来获取位置信息，我在提交表单时如何使用 PHP 访问该信息?

UPDATE: OK, I guess I simplified that too much. What I'm trying to do is create a form that will update a Twitter status when submitted. I've got the form working OK, but I want to also add geolocation data. Since I'm using Javascript (specifically, the Google Geolocation API) to get the location, how do I access that information with PHP when I'm submitting the form?

推荐答案

简短的回答是你不能.

我不懂任何 PHP 语法，但我可以告诉你的是，PHP 在服务器上执行，而 JavaScript 在客户端(在浏览器上)执行.

I don't know any PHP syntax, but what I can tell you is that PHP is executed on the server and JavaScript is executed on the client (on the browser).

您正在执行 $_GET，用于检索表单值:

You're doing a $_GET, which is used to retrieve form values:

内置的 $_GET 函数用于以 method="get" 的形式收集值.

The built-in $_GET function is used to collect values in a form with method="get".

换句话说，如果您的网页上有:

In other words, if on your page you had:

<form method="get" action="blah.php">
    <input name="test"></input>
</form>

您的 $_GET 调用将检索该输入字段中的值.

Your $_GET call would retrieve the value in that input field.

那么如何从 JavaScript 中检索值?

So how to retrieve a value from JavaScript?

好吧，您可以将 javascript 值粘贴在隐藏的表单字段中...

Well, you could stick the javascript value in a hidden form field...

<script type="text/javascript" charset="utf-8">
    var test = "tester";
    // find the 'test' input element and set its value to the above variable
    document.getElementByID("test").value = test;
</script>

... elsewhere on your page ...

<form method="get" action="blah.php">
    <input id="test" name="test" visibility="hidden"></input>
    <input type="submit" value="Click me!"></input>
</form>

然后，当用户单击您的提交按钮时，他/她将向 blah.php 发出GET"请求，并发送 'test' 中的值.

Then, when the user clicks your submit button, he/she will be issuing a "GET" request to blah.php, sending along the value in 'test'.

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