如何从另一个PHP文件中的ajax获取变量
[英]How get variable from ajax in another php file
问题描述
The problem is when I click on "submit data" button I get the response (this is correct), but when I click on "go to the php file" link (which is the same php file as previously) I get Undefined index: firstname and Undefined index: lastname error. 
问题是当我单击“提交数据”按钮时，我得到了响应（这是正确的），但是当我单击“转到php文件”链接（与以前的PHP文件相同）时，我得到了未定义索引：名和未定义索引：名错误。 How can I fix it? 我该如何解决？
Here is my code: 这是我的代码：
<html>
<head>
<script>
function ajax_post(){
// Create our XMLHttpRequest object
var hr = new XMLHttpRequest();
// Create some variables we need to send to our PHP file
var url = "my_parse_file.php";
var fn = document.getElementById("first_name").value;
var ln = document.getElementById("last_name").value;
var vars = "firstname="+fn+"&lastname="+ln;
hr.open("POST", url, true);
// Set content type header information for sending url encoded variables in the request
hr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
// Access the onreadystatechange event for the XMLHttpRequest object
hr.onreadystatechange = function() {
if(hr.readyState == 4 && hr.status == 200) {
var return_data = hr.responseText;
document.getElementById("status").innerHTML = return_data;
}
}
// Send the data to PHP now... and wait for response to update the status div
hr.send(vars); // Actually execute the request
document.getElementById("status").innerHTML = "processing...";
}
</script>
</head>
<body>
<h2>Ajax Post to PHP and Get Return Data</h2>
First Name: <input id="first_name" name="first_name" type="text"> <br><br>
Last Name: <input id="last_name" name="last_name" type="text"> <br><br>
<input name="myBtn" type="submit" value="Submit Data" onclick="ajax_post();"> <br><br>
<div id="status"></div>
<a href="my_parse_file.php">go to the php file</a>
</body>
and the php file 和PHP文件
<?php
echo 'Thank you '. $_POST['firstname'] . ' ' . $_POST['lastname'] . ', says the PHP file';
?>
3 个解决方案
解决方案1
0 2016-04-11 14:24:18
Because both are different requests : 因为两者是不同的请求：
As you are passing parameters firstname and lastname using AJAX. 当你正在传递参数firstname和lastname使用AJAX。 You have to pass the same in URL using GET request. 您必须使用GET请求在URL传递相同的内容。
go to the php file 转到PHP文件
<?php
echo 'Thank you '. $_REQUEST['firstname'] . ' ' . $_REQUEST['lastname'] . ', says the PHP file';
?>
Output : 输出：
Thank you abc xyz , says the PHP file 谢谢abc xyz ，说PHP文件
It will work in both Submit button and Hyperlink . 它可以在Submit button和Hyperlink 。
解决方案2
0 2016-04-11 14:26:42
By clicking the link your browser sends not a POST request, but a GET request to your server-side. 通过单击链接，浏览器不会向服务器端发送POST请求，而是发送GET请求。 That is why the global array $_POST doesn't contains the elements you are trying to retrieve in your PHP file. 这就是为什么全局数组$ _POST不包含您试图在PHP文件中检索的元素的原因。 The error message points you that there is no such elements in the $_POST array like "firstname" and "lastname". 错误消息指出您$ _POST数组中没有“ firstname”和“ lastname”之类的元素。 It is recommended to add a check whether the array elements exist like so: 建议添加检查是否存在数组元素，如下所示：
<?php
if (isset($_POST['firstname']) && isset($_POST['lastname'])) {
echo 'Thank you '. $_POST['firstname'] . ' ' . $_POST['lastname'] . ', says the PHP file';
} else {
echo 'Nothing to say';
}
解决方案3
0 2016-04-11 14:40:48
Thanks RJ for explanation. 感谢RJ的解释。 Now i fixed it and works properly. 现在，我修复它并正常工作。
But I am worried, because i used this code only for training. 但是我很担心，因为我仅将此代码用于培训。 In my main problem i need to send the real object (not string etc.) by ajax to my php site, so i cant add it to the url, can I? 在我的主要问题中，我需要通过ajax将真实对象（而不是字符串等）发送到我的php站点，因此我无法将其添加到url中，可以吗？
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