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[英]I am trying to write a simple asynchronous code in JS, but it doesn't seem to work
[英]Why doesn't this JS & PHP code work? (I am trying to send a value from JS to PHP)
我有一個名為sample.php
的文件,其中包含此代碼,其任務是通過 AJAX 將變量值從 JS POST 到 PHP。 這是代碼:
<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript">
var ThunkableWebviewerExtension = {
receiveMessage: function(fxn) {
var callbackFunction = function(event) {
if (typeof fxn === 'function') {
fxn(event.data)
}
};
document.addEventListener('message', callbackFunction, false);
window.addEventListener('message', callbackFunction, false);
}
}
</script>
</head>
<body>
<script type="text/javascript">
var value;
ThunkableWebviewerExtension.receiveMessage(function(message) {
value = message; //this is the value I want to send to PHP
});
//sending the value with ajax (POST)
return new Promise((resolve, reject) => {
$.ajax({
url : "./sample.php", //same file
method : "POST",
data: {"data": value},
success : (res) => {
resolve(res)
},
error : (res) => {
reject(res)
}
})
})
</script>
<?php
echo $_POST['data']; //nothing comes here...
?>
</body>
</html>
我唯一的目標是在 PHP 中訪問value
變量的值(在 JS 端)。 我開始知道這可以用 AJAX 來完成,所以我試過了,但沒有用 - PHP 代碼沒有回顯任何東西......問題在哪里?
替代方法(用於在 PHP 中訪問 JS 變量的值)非常受歡迎。 :)
首先,為了運行 ajax 函數,您需要jQuery 。 然后你必須從 ajax 調用中刪除promise
,因為根據文檔- “$.ajax() 返回的 jqXHR 對象從 jQuery 1.5 開始實現了 Promise 接口,為它們提供了 Promise 的所有屬性、方法和行為”
<!DOCTYPE html>
<html lang="en">
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
<head>
<script type="text/javascript">
var ThunkableWebviewerExtension = {
receiveMessage: function(fxn) {
var callbackFunction = function(event) {
if (typeof fxn === 'function') {
fxn(event.data)
}
};
document.addEventListener('message', callbackFunction, false);
window.addEventListener('message', callbackFunction, false);
}
}
</script>
</head>
<body>
<script type="text/javascript">
var value ;
ThunkableWebviewerExtension.receiveMessage(function(message) {
value = message; //this is the value I want to send to PHP
});
//sending the value with ajax (POST)
$.ajax({
url : "./sample.php", //same file
method : "POST",
data: {"data": value},
success : (res) => {
console.log(res);
},
error : (res) => {
console.log(res);
}
})
</script>
<?php
echo $_POST['data']; //nothing comes here...
?>
</body>
</html>
如果您在添加此解決方案后出現Undefined Index: data
錯誤,您可以在您的 JS 代碼中的value
變量中添加一個示例值。
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