使用AJAX将PHP变为javascript？ [英] Php variable to javascript with AJAX?
问题描述
Hy
如何从PHP获取变量值，我修改了这段代码：
JavaScript Ajax发布到PHP文件XMLHttpRequest对象返回数据教程 [
Hy
how can I get back variable value from PHP , I modified this code:
JavaScript Ajax Post to PHP File XMLHttpRequest Object Return Data Tutorial[
Ajax Post to PHP File XMLHttpRequest Object Return Data Tutorial
]
如果我用PHP计算某些东西.. 。并在PHP中创建数组，如何在这个JS函数中传递值/ ajax_post（）/示例中的内容？
我有什么试过：
]
If I calculate something in PHP...and create array in PHP , how can I pass the value in this JS function/ajax_post()/ what is in the example?
What I have tried:
my_parse_file.php
<?php
echo 'Thank you '. $_POST['firstname'] . ' ' . $_POST['lastname'] . ', says the PHP file';
?>
example.html
example.html
<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>
</body>
</html>
推荐答案
_POST [' firstname']。 ' '。
_POST['firstname'] . ' ' .
_POST [' lastname']。 ' ，表示PHP文件';
？>
_POST['lastname'] . ', says the PHP file'; ?>
example.html
example.html
<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>
</body>
</html>
how我可以从PHP中获取变量值，我修改了这段代码：
how can I get back variable value from PHP , I modified this code:
你可以这样做
You can do like
var data = <?php echo json_encode("42", JSON_HEX_TAG); ?>;
从您的代码中很难理解，您在何处尝试访问该值从您的PHP代码。
还有其他几种方法可以做到这一点。我强烈建议您在继续对代码进行更改之前阅读StackOverflow中的以下主题。
如何将变量和数据从PHP传递给JavaScript？ - Stack Overflow [ ^ ]
如果你的要求不是这个，请告诉我。
希望，它有帮助：）
It's hard to understand from your code, where exactly you are trying to access the value from your php code.
There are few other ways available to do this. I would strongly recommend to read following thread in StackOverflow before you go ahead to do the changes in your code.
How to pass variables and data from PHP to JavaScript? - Stack Overflow[^]
Please let me know if your requirement is something else than this.
Hope, it helps :)
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