我会以错误的方式解决这个问题吗?
添加了2个代码示例!
对这里的其他人来说可能很简单,我是 Amp html 和 mustache 的新手,我在使用表单创建 AMP 页面时遇到了一个令人沮丧的问题,但它几乎就在那里!
我必须重写几次,结果总是一样!我试图始终返回通过表单提交的正确值,然后从数据库中提取,它仅在页面刷新时第二次起作用,即*按 f5 并再次尝试,否则它显示相同的内容。
它基本上用从数据库返回的内容加载 div,如果它存在与否。
我认为问题在于会话,我必须创建一个成功和错误变量来显示不同的内容,具体取决于数据是否存在于数据库中,因为 XHR 响应将始终成功,除非出现问题。
无论我将会话未设置值放在哪里,它要么什么都不做,要么使请求不起作用。
基于会话的示例:
<?php
session_start();
header("Access-Control-Allow-Credentials: true");
header("AMP-Same-Origin : true");
header("Access-Control-Allow-Origin: *.ampproject.org");
header("AMP-Access-Control-Allow-Source-Origin: http://www.example.com");
header("Access-Control-Expose-Headers: AMP-Access-Control-Allow-Source-Origin");
include_once('../includes/dbcon.php');
if(isset($_POST['value'])){
$value = isset($_POST['value']) ? $_POST['value'] : '';
//json
header("Content-Type: application/json");
//remove out any spaces from $_post value
$value = str_replace(" ", "", $_POST['value']);
//make session the same as $_post value
$_SESSION["value"] = $value;
$value = $_SESSION["value"];
//check the db
$query = $db->prepare("SELECT * FROM posts WHERE value = '" . $value . "'");
$query->execute();
$rows = $query->fetchAll(PDO::FETCH_ASSOC);
if( $query->rowCount() > 0){
foreach($rows as $row) {
// value exists
$_SESSION['msg'] = 'success';
$output = $_SESSION['msg'];
echo json_encode($output);
}
} else {
// value does not exist
$_SESSION['msg'] = 'error';
$output = $_SESSION['msg'];
echo json_encode($output);
}
} else { //show page
include_once('includes/header.php'); //includes the amped form and mustache.js files etc
?>
<h1>Check value.</h1>
<form method="POST" action-xhr="//www.example.com/test" target="_blank">
<fieldset>
<label>
<span>Check VALUE</span>
<input type="text" name="value" required>
</label>
<input type="submit" value="Check">
</fieldset>
<div submit-success>
<template type="amp-mustache">
<?php
$response = $_SESSION['msg'];
//echo $response .' ( '.$_SESSION['value'] .' ) '; //test the session value returned
if($response==='success') {
echo 'Value already exists! do something here';
} else if($response==='error') {
echo 'Value does not exist! do something here';
}
?>
</template>
</div>
<div submit-error>
<template type="amp-mustache">
Something has gone wrong! (todo) If there is no response from xhr request then this error is displayed.
</template>
</div>
</form>
<?php include_once('includes/footer.php');
}
?>
下面的原始版本使用 amp-mustache,工作(有点)很好,但不可能且无用,因为我无法将 html 从错误或成功消息呈现到浏览器,也无法操作或比较 mustache 标签与 PHP 逻辑。
它必须是可能的...... 例如返回读取的json数组:
"Success! Value found click here: <a href="#">link</a>"
不是html所以不可能添加按钮等。
这就是我在检查值后需要完成的全部工作。
使用 mustache 标签的版本
<?php
header("Access-Control-Allow-Credentials: true");
header("AMP-Same-Origin : true");
header("Access-Control-Allow-Origin: *.ampproject.org");
header("AMP-Access-Control-Allow-Source-Origin: http://www.example.com");
header("Access-Control-Expose-Headers: AMP-Access-Control-Allow-Source-Origin");
header("Cache-Control:private");
include_once('../includes/dbcon.php');
if(isset($_POST['value'])){
$value = isset($_POST['value']) ? $_POST['value'] : '';
//json
header("Content-Type: application/json");
//take out any spaces from the value first
$value = str_replace(" ", "", $_POST['value']);
//check db
$query = $db->prepare("SELECT * FROM posts WHERE value = '" . $value . "'");
$query->execute();
$rows = $query->fetchAll(PDO::FETCH_ASSOC);
if( $query->rowCount() > 0){
foreach($rows as $row) {
// value exists
echo json_encode(array('value'=>'My success message.'));
}
} else {
// value does not exist
echo json_encode(array('value'=>'error.<a href="#">test</a>')); //does not display as html
}
} else { //show page
include_once('includes/header.php'); //includes the amped form and mustache.js files etc
?>
<h1>Check value.</h1>
<form method="POST" action-xhr="//www.example.com/test" target="_blank">
<fieldset>
<label>
<span>Check Value</span>
<input type="text" name="value" required>
</label>
<input type="submit" value="Check">
</fieldset>
<div submit-success>
<template type="amp-mustache">
{{value}}
</template>
</div>
<div submit-error>
<template type="amp-mustache">
Something has gone wrong! (todo) If no response from xhr request then this error is displayed.
</template>
</div>
</form>
<?php include_once('includes/footer.php');
}
?>