使用下拉（选择）菜单修改表单
所以我尝试使用此代码从数据库中获取记录，但我只获得else alert message。有人可以说我做错了什么或代码中的错误在哪里？它填充了下拉列表，但就像我说的那样，我不会仅获得结果警告消息：
<form method='post' action='grafikastest.php'>
<select id="name">
<?php
include_once ('inc\connect.php');
echo "Pasirinkite datą:  ";
$date = strtotime("+0 day");
$dtt=date('Y-m-d', $date);
echo "<option value=$dtt>$dtt</option>";
$date = strtotime("+1 day");
$dtt=date('Y-m-d', $date);
echo"<option value=$dtt>$dtt</option>";
$date = strtotime("+2 day");
$dtt=date('Y-m-d', $date);
echo "<option value=$dtt>$dtt</option>";
$date = strtotime("+3 day");
$dtt=date('Y-m-d', $date);
echo "<option value=$dtt>$dtt</option>";
$date = strtotime("+4 day");
$dtt=date('Y-m-d', $date);
echo "<option value=$dtt>$dtt</option>";
$date = strtotime("+5 day");
$dtt=date('Y-m-d', $date);
echo "<option value=$dtt>$dtt</option>";
$date = strtotime("+6 day");
$dtt=date('Y-m-d', $date);
echo "<option value=$dtt>$dtt</option>";
$sql = "SELECT ID, data, laikas, laikas2 FROM vizitai4 WHERE darb_stat NOT LIKE 'Atlikta' and data LIKE '%" . $dtt . "%' OR
darb_stat IS NULL and data LIKE '%" . $dtt . "%' GROUP BY laikas";
$result = mysql_query($sql);
//rodymas lenteleje
echo $dtt;
echo "<table id=t01>
<tr>
<th>Data</th>
<th>Remonto pradžia</th>
<th>Remonto pabaiga</th>
</tr>";
if(mysql_num_rows($result) > 0) {
while( $row=mysql_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['data'] . "</td>";
echo "<td>Remontas prasideda nuo " . $row['laikas'] . " </td>";
echo "<td>Numatomas remonto baigimo laikas " . $row['laikas2'] . " </td>";
echo "<td style='display: none;'><form method=post>
<input name=id type=hidden value='".$row['id']."';>
</form></td>";
echo "</tr>";
}
}else{
echo "<script>alert('Šios dienos įrašų nėra');</script>";
}
echo "</table>";
?>
</select>
<input type="submit" name="submit" value="Ieskoti">
</form>
</body>
</html>
1 个答案:
答案 0 :(得分：1)
从我们的交流中，问题的核心是您希望与表单进行交互以更改表单本身，并且您只想使用PHP来实现此目的。由于PHP运行一次以生成页面，因此您无法与表单元素进行交互，并让PHP对这些更改做出反应。您需要一个将重新查询PHP的触发效果。这是一个客户端语言的工作，如JavaScript。
因为你在这里要一个例子是一个基本的例子。这不是一件容易的事，并且有一堆活动部件，所以我有一种感觉，如果你＆＃34;几乎不知道这些东西...＆＃34; 你现在拥有的东西，你这个答案真的会在黑暗中。
按照说明操作，它应该适合您。我已经测试了大多数（或者已经从我使用的脚本中复制了片段）所以要注意所谓的内容以及放置它们的位置并阅读符号。我建议你创建这个目录/文件结构，然后在尝试对工作文档进行任何修改之前对其进行测试。一旦你做了这些事情，如果你不知道你在做什么，几乎不可能排除故障。另请注意，我不能在良心的情况下回答此问题而不删除对mysql_的引用，这些函数已被弃用或完全删除（php7）：
<强> /config.php
<?php
// This page goes on every main page of your site
// Comment out the error lines when live,
// you don't want errors showing on your page except in test
session_start();
ini_set("display_errors",1);
error_reporting(E_ALL);
define('DB_HOST','yourdbhost');
define('DB_USERNAME','yourdbusername');
define('DB_PASSWORD','yourdbpass');
define('DB_NAME','yourdbname');
define('SITE_ROOT',__DIR__);
define('DS', DIRECTORY_SEPARATOR);
define('CLASS_DIR', SITE_ROOT.DS.'core'.DS.'classes');
define('FUNCTION_DIR', SITE_ROOT.DS.'core'.DS.'functions');
require_once(FUNCTION_DIR.DS.'autoloader.php');
// This will help to autoload your classes
// **RESOURCE:** http://php.net/manual/en/function.spl-autoload-register.php
spl_autoload_register('autoloader');
// put whatever else you want on this page to make available to your site.
// You don't need the database connection however
<强> /core/functions/makeOptions.php
<?php
/*
** @description This function uses a for loop to make your options
** You need to think how to use php to make your script(s)
** for you
** **RESOURCE:** http://php.net/manual/en/control-structures.for.php
** @param $max [int] This is how many options the function will make
*/
function makeOptions($max = 6)
{
for($i = 0; $i <= $max; $i++) {
$date = strtotime("+".$i." day");
$dtt = date('Y-m-d', $date);
echo '<option value="'.$dtt.'">'.$dtt.'</option>'.PHP_EOL;
}
}
<强> /core/functions/autoloader.php
<?php
/*
** @description This function is used to autoload classes
** @param $class [string] This is automated and is populated by spl_autoload_register()
** **RESOURCE:** http://php.net/manual/en/function.spl-autoload-register.php
*/
function autoloader($class)
{
if(class_exists($class))
return true;
if(is_file($inc = CLASS_DIR.DS.$class.".php"))
include_once($inc);
}
<强> /page1.php
<?php
// Include our config file
require_once(__DIR__.DIRECTORY_SEPARATOR.'config.php');
// Include the function to create our options
include_once(FUNCTION_DIR.DS.'makeOptions.php');
?><!DOCTYPE html>
<html>
<head>
<!-- include in head with anything else you need -->
<!-- **RESOURCE:** http://www.jquery.com/ -->
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript" src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
<script>
$(document).ready(function(){
// Observe any change made to select with name=name
$(this).on('change','select[name=name]',function() {
// get the value of that selection
var thisVal = $(this).val();
// Use ajax to query page2.php
// **RESOURCE:** http://api.jquery.com/jquery.ajax/
$.ajax({
// This is the link that will load the contents of the form
url: '/page2.php',
data: {
// This is equivalent to $_POST['name']
"name":thisVal
},
type: 'POST',
success: function(response) {
// On success of the ajax, this will post the contents of
// page2.php into the div with id=loadspot
$("#loadspot").html(response);
}
});
});
});
</script>
</head>
<body>
<form method='post' action='grafikastest.php'>
<!--
I am not sure the placement of this text, but it can not be
in the middle of a drop down
-->
Pasirinkite datą:  
<select id="name" name="name">
<option value="">Select</option>
<!-- Apply the options function -->
<?php makeOptions(); ?>
</select>
<!-- This is where you will load the contents of the dropdown via ajax -->
<div id="loadspot"></div>
<input type="submit" name="submit" value="Ieskoti">
</form>
</body>
</html>
<强> /core/classes/Database.php
<?php
/*
** @description This class is your new database which replaces your `mysql_`
** **RESOURCE:** http://php.net/manual/en/pdo.connections.php
*/
class Database
{
// static elements are kind of like a global
private static $singleton;
private static $con;
// This will save the class for reuse
public function __construct()
{
if(self::$singleton instanceof Database)
return self::$singleton;
self::$singleton = $this;
}
// This is the connection to the database
public function connect()
{
if(self::$con instanceof PDO)
return self::$con;
// Review the PDO class for instruction how to make this
// connection better using some PDO presets (Emulation of prepares, etc)
// **RESOURCE** http://php.net/manual/en/pdo.constants.php
self::$con = new PDO("mysql:host=".DB_HOST.";dbname=".DB_NAME,DB_USERNAME,DB_PASSWORD);
return self::$con;
}
}
<强> /core/classes/qEngine.php
<?php
/*
** @description This class is what you use to safely query your database
** **RESOURCE:** http://php.net/manual/en/pdo.prepare.php
** **RESOURCE:** http://php.net/manual/en/pdo.query.php
** **RESOURCE:** http://php.net/manual/en/pdostatement.fetch.php
**
*/
class qEngine
{
private static $con;
private $query;
public function query($sql = false,$bind = false)
{
// This checks if the connection is already saved
// You can also use "dependency injection" to pass your
// database connection to this class. I prefer to use
// a static connection but here is how that dependency works:
// **RESOURCE** http://code.tutsplus.com/tutorials/dependency-injection-in-php--net-28146
// **RESOURCE** https://en.wikipedia.org/wiki/Dependency_injection
if(!(self::$con instanceof PDO)) {
// Makes connection
$dbEngine = new \Database();
self::$con = $dbEngine->connect();
}
// Creates a bind array
// **RESOURCE** http://php.net/manual/en/pdostatement.bindvalue.php
// **RESOURCE** http://php.net/manual/en/pdostatement.execute.php (Example #2)
// **RESOURCE** http://php.net/manual/en/pdostatement.bindparam.php
if(!empty($bind)) {
$bArray = false;
foreach($bind as $key => $value) {
$bKey = ":{$key}";
$bArray[$bKey] = $value;
}
}
// If there is a bind array, it will run a prepare
if(!empty($bArray)) {
$this->query = self::$con->prepare($sql);
$this->query->execute($bArray);
}
// If no bind, it will run a straight query
else {
$this->query = self::$con->query($sql);
}
// This returns the object for method chaining
// **RESOURCE** http://stackoverflow.com/questions/3724112/php-method-chaining
return $this;
}
public function getResults()
{
// This will check that a query has been made
if(empty($this->query))
return 0;
// This will loop through the results and save to 1D array
while($result = $this->query->fetch(PDO::FETCH_ASSOC))
$row[] = $result;
// This will return either the array or a "0"
return (!empty($row))? $row : 0;
}
}
<强> /core/functions/getListByDate.php
<?php
/*
** @description This function will query your database safely
** @param $date [string] Receives a date by string
*/
function getListByDate($date)
{
$bind = array('%'.$date.'%','%'.$date.'%');
return (new \qEngine()) ->query("SELECT `ID`,`data`,`laikas`,`laikas2`
FROM `vizitai4`
WHERE `darb_stat`
NOT LIKE 'Atlikta'
AND `data`
LIKE :0
OR `darb_stat`
IS NULL AND `data`
LIKE :1
GROUP BY `laikas`",$bind)
->getResults();
}
<强> /page2.php
<?php
// Include our config file
require_once(__DIR__.DIRECTORY_SEPARATOR.'config.php');
// Include the function to query the database
include_once(FUNCTION_DIR.DS.'getListByDate.php');
// This is the page that the AJAX queries from page1.php
// See if the post has been made
if(!empty($_POST['name'])) {
// Fetch data from database
$vizitai4 = getListByDate($_POST['name']);
?>
<table id="t01">
<tr>
<th>Data</th>
<th>Remonto pradžia</th>
<th>Remonto pabaiga</th>
</tr>
<?php
if($vizitai4 != 0) {
foreach($vizitia4 as $row) {
?> <tr>
<td><?php echo $row['data']; ?></td>
<td>Remontas prasideda nuo <?php echo $row['laikas']; ?></td>
<td>Numatomas remonto baigimo laikas <?php echo $row['laikas2']; ?> </td>
<td style="display: none;"><input name="id[]" type="hidden" value="<?php echo $row['id']; ?>" /></td>
</tr>
<?php
}
}
else {
?>
<script>
alert('Šios dienos įrašų nėra');
</script>
<?php
}
?>
</table>
<?php
}
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