[英]Call a PHP File with AJAX
我一直在尋找其他問題,並從相應的答案中得出了自己的代碼,但我似乎無法實現這一目標。 如果有人比我經驗豐富,可以幫助我更清楚地了解這一點,我將不勝感激。
jQuery的:
$(function () {
$(".going-decision").click(function () {
var clickBtnValue = $(this).val();
alert('clicked');
$.ajax({
type: "POST",
url: "http://localhost/townbuddies/public_html/event_going_ajax.php",
data: {'btn-clicked': clickBtnValue},
success: function () {
alert('success');
}
});
});
});
event_going_ajax.php:
if (isset($_POST['btn-clicked'])) {
$decision = $_POST['btn-clicked'];
//Logic that writes to database
}
我的HTML按鈕確實具有“ going-decision”類。 包括jQuery庫。
結果:顯示“已單擊”警報以及“成功”警報。 但是,數據庫未更新。
任何人都暗示這里發生了什么事? 謝謝。
編輯,這是我的PHP代碼。 我知道這是非安全代碼,我目前正在學習PHP。
<?php
session_start();
$user_id = $_SESSION['user'];
define('DB_HOST', 'localhost');
define('DB_USER', 'root');
define('DB_PASSWORD', '');
define('DB_NAME', 'townbuddies');
$con = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
if (isset($_POST['btn-clicked'])) {
//Value will be in this format: 'decision.event_id'
$value = $_POST['btn-clicked'];
$length = strlen($value);
$findme = '.';
$pos = strpos($value, $findme);
//Separating the decision (going/not going) and the event_id
$decision = substr($value, 0, $pos);
$event_id = substr($value, $pos + 1);
//Verify if user is already 'going' to the event
$result = verifyDatabase($con, $user_id, $event_id);
//Depending on user decision
switch ($decision) {
case 'going':
going($con, $result, $user_id, $event_id);
break;
case 'not_going':
notGoing($con, $result, $user_id, $event_id);
break;
}
}
function verifyDatabase($con, $user_id, $event_id) {
//Verify if already in database
$sql = "SELECT * "
. "FROM user_events "
. "WHERE event_id = "
. "'$event_id'"
. "AND user_id = "
. "'$user_id'";
$result = mysqli_query($con, $sql);
return $result;
}
function going($con, $result, $user_id, $event_id) {
//If already in database as 'going', then do not duplicate. Do nothing.
if (!empty($result)) {
header("Location: http://localhost/townbuddies/public_html/event.php?event=" . $event_id);
exit;
}
//Not in database as 'going', so add it.
else {
$sql = "INSERT INTO user_events (user_id,event_id) "
. "VALUES ("
. "'$user_id'"
. ","
. "'$event_id'"
. ")";
if (!mysqli_query($con, $sql)) {
echo "Error: " . $sql . "<br>" . mysqli_error($con);
}
//Update amount of people going.
$sql =
mysqli_close($con);
}
exit;
}
function notGoing($con, $result, $user_id, $event_id) {
//If already in database as 'going', then delete
if (!empty($result)) {
$sql = "DELETE FROM user_events "
. "WHERE user_id = "
. "'$user_id'"
. "AND event_id = "
. "'$event_id'";
if (!mysqli_query($con, $sql)) {
echo "Error: " . $sql . "<br>" . mysqli_error($con);
}
mysqli_close($con);
}
exit;
}
?>
編輯#2:表格
<!DOCTYPE html>
<html lang = "en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<meta name="generator" content="Bootply" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<title>Event</title>
<link href = "css/main.css" rel = "stylesheet" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"> </script>
<script src="js/event.js"></script>
</head>
<body>
<button type = "submit" id = "go-btn" class = "going-decision" value="going.' . $event_id . '">Going</button>
<button type = "submit" id = "no-go-btn" class = "going-decision" value="not_going.' . $event_id . '">Not Going</button>
</body>
編輯#3:解決方案
實際上,問題出在我的PHP腳本中。 在函數going()和notGoing()中,該語句
if (!empty($result))
將無法按預期方式工作...如果我互換if和else語句,則一切正常...
為什么mySQL的空結果對於該語句不會為空?
我希望我錯了,但是您的SQL查詢有一個錯誤。
$sql = "INSERT INTO user_events (user_id,event_id) "
. "VALUES ("
. "'$user_id'"
. ","
. "'$event_id'"; // should be ."'$event_id')"
沒有條件的右括號,這會中斷查詢。
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