我在这里踢自己的屁股，因为我一辈子都想不通......这应该是一个快速而肮脏的项目，但是，我决定尝试一些新的东西，而且我对jQuery中的AJAX方法几乎没有经验......我花了 5 天时间试图学习和理解如何正确实现 AJAX 调用，但要知道有用......我学到了一些基本的东西，但没有学到执行下面代码所需的内容。
同样，我想知道如何使用 jQuery 将此标准请求转换为 AJAX......
这是我的表单和PHP
.HTML：
<form action="categories.php?action=newCategory" method="post">
<input name="category" type="text" />
<input name="submit" type="submit" value="Add Categories"/>
</form>
.PHP：
<?php
if (isset($_POST['submit'])) {
if (!empty($_POST['category'])) {
if ($_GET['action'] == 'newCategory') {
$categories = $_POST['category'];
$query = "SELECT * FROM categories WHERE category ='$categories' ";
$result = mysql_query($query) or die(mysql_error());
if (mysql_num_rows($result)) {
echo '<script>alert("The Following Catergories Already Exist: ' . $categories . '")</script>';
} else {
// Simply cleans any spaces
$clean = str_replace(' ', '', $categories);
// Makes it possible to add multiple categories delimited by a comma
$array = explode(",", $clean);
foreach ($array as &$newCategory) {
mysql_query("INSERT INTO categories (category) VALUES ('$newCategory')");
}
echo "<script>alert('The following Categories have been added successfully: " . $categories . "')</script>";
}
}
} else {
echo "<script>alert('Please Enter at Least One Category.')</script>";
}
}
?>
这是在后台进行调用并且不提交表单但仍发送/检索结果的正确语法。
$(function(){
$('form').submit(function(e){
e.preventDefault(); // stop default form submission
$.ajax({
url: 'categories.php',
data: 'action=newCategory',
success: function(data){
//here we have the results returned from the PHP file as 'data'
//you can update your form, append the object, do whatever you want with it
//example:
alert(data);
}
});
});
});
也：
我不会这样做 ->
echo "<script>alert('Please Enter at Least One Category.')</script>";
就做echo 'Please Enter at Least One Category.';
如果需要创建错误系统，可以执行以下操作：
echo "Error 1001: <!> Please enter at least One Category!';
然后在 Ajax 对"成功"的回调中，我们可以将返回的对象拆分为 <!> 。要遵循的示例：
success: function(data){
if($(data+':contains("<!>")'){
var errMsg = $(data).split('<!>');
alert(errMsg[0]+' : '+errMsg[1]);
//above would output - Error 1001 : Please enter at least One Category!;
}
}