我已经设法完成并走到这一步，但是在获取第二个下拉框来显示 mysql 数据库所需的信息然后将其与其他信息一起添加到数据库时遇到问题。
错误:第二个下拉菜单将显示数据但不会显示所选元素
注意:Undefined index: name in C:\xampp\htdocs\clock\pages\Work.php on line 206
警告:mysqli_fetch_array() 期望参数 1 为 mysqli_result，第 221 行 C:\xampp\htdocs\clock\pages\Work.php 中给出的 bool 值
代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<title>Jobs Plus Door Clock</title>
<!-- Bootstrap Core CSS -->
<link href="../vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<!-- MetisMenu CSS -->
<link href="../vendor/metisMenu/metisMenu.min.css" rel="stylesheet">
<!-- Custom CSS -->
<link href="../dist/css/sb-admin-2.css" rel="stylesheet">
<!-- Morris Charts CSS -->
<link href="../vendor/morrisjs/morris.css" rel="stylesheet">
<!-- Custom Fonts -->
<link href="../vendor/font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
<style type="text/css">
.aah {
color: white
}
.aah:hover {
color: white
}
</style>
</head>
<body>
<body style="overflow:auto;">
<div id="wrapper">
<div class="navbar-default " role="navigation">
<div class="container-fluid">
<ul class="nav navbar-nav" id="side-menu">
<li>
<a href="index.php"><i class="fa fa-dashboard fa-fw"></i> Door Clock </a>
</li>
<li>
<a href="Work.php"><i class="fa fa-hourglass fa-fw"></i> Work Clock</a>
</li>
<li>
<a href="#"><i class="fa fa-wrench fa-fw"></i>Manage Employees<span class="fa arrow"></span></a>
<ul class="nav nav-second-level">
<li>
<a href="add.php">Add Employee</a>
</li>
<li>
<a href="employees.php">Employees</a>
</li>
</ul>
<!-- /.nav-second-level -->
</li>
auto
<li>
<a href=""><i class="fa fa-hourglass fa-fw"></i> Back To Job Time</a>
</li>
<li>
<a href="time.php"><i class="fa fa-hourglass fa-fw"></i> Hours Worked</a>
</li>
<li>
<a href="export.php">Export</a>
</li>
</ul>
</div>
<!-- /.sidebar-collapse -->
</div>
<!-- /.navbar-static-side -->
<div id="page-wrapper">
<div class="row">
<div class="col-lg-12">
<h3 class="page-header">Dashboard (TODAY) <?= date("Y-m-d") ?></h3>
</div>
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
<div class="row">
<div class="col-md-12 col-sm-12">
<div class="panel panel-default">
<div class="panel-heading">
<div class="row">
<?php
if (isset($_POST[ 'add' ])) {
include_once 'dbconnect.php';
$id = $_POST[ 'employee' ];
if (mysqli_query($con, "INSERT INTO `timing` (`employee_id`,start,date) VALUES "
. "(" . $id . ",NOW(),CURDATE())")) {
echo '<div class="alert alert-success">
Time Added
</div>';
} else {
echo '<div class="alert alert-danger">
Error while adding
</div>';
}
}
if (isset($_POST[ 'end' ])) {
include_once 'dbconnect.php';
$id = $_POST[ 'id' ];
if (mysqli_query($con, "UPDATE `timing` set end=NOW() where id=" . $id)) {
echo '<div class="alert alert-success">
Time Stopped
</div>';
} else {
echo '<div class="alert alert-danger">
Error while stopping
</div>';
}
}
?>
<form method="post">
<div class="col-xs-6">
<label>
<select name="employee" class="form-control">
<?php
include_once 'dbconnect.php';
$result2 = mysqli_query($con, "SELECT * from employees ORDER BY name ");
while ($row2 = mysqli_fetch_array($result2)) {
$name = $row2[ 'name' ];
$id = $row2[ 'id' ];
echo '<option value="' . $id . '">' . $name . '</option>';
}
?>
</select>
</label>
</div>
<div class="col-xs-6">
<form method="post">
<div class="col-xs-6">
<label>
<select name="code_id" class="form-control">
<?php
include_once 'dbconnect.php';
$result3 = mysqli_query($con, "SELECT * from codetiming ");
while ($row2 = mysqli_fetch_array($result3)) {
$name1 = $row2[ 'name' ];
$id = $row2[ 'id' ];
echo '<option value="' . $id . '">' . $name1 . '</option>';
}
?>
</select>
</label>
</div>
<div class="col-xs-6">
<input class="btn btn-primary" type="submit" name="add" value="Set Time"/>
<label>
<input class="btn btn-primary" type=name="add" value="Clock All Out"/>
</label>
</div>
</form>
</div>
</div>
</div>
</div>
<?php
$result = mysqli_query($con, "SELECT *,TIMESTAMPDIFF(HOUR, start, end)
as `difference` from timing where date = CURDATE()");
while ($row = mysqli_fetch_array($result)) {
$empolyee_id = $row[ 'employee_id' ];
$id = $row[ 'id' ];
$start = date_create($row[ 'start' ]);
$start = date_format($start, "Y-m-d h:i:s A");
$code_id = $row[ 'name1' ];
if (!empty($row[ 'end' ])) {
$end = date_create($row[ 'end' ]);
$end = date_format($end, "Y-m-d h:i:s A");
} else {
$end = $row[ 'end' ];
}
$result2 = mysqli_query($con, "SELECT * from employees where id=" . $empolyee_id);
$row2 = mysqli_fetch_array($result2);
$name = $row2[ 'name' ];
$result2 = mysqli_query($con, "SELECT * from codetiming where id=" . $code_id);
$row2 = mysqli_fetch_array($result2);
$name1 = $row2[ 'name1' ];
echo '<center><h4><b><h1 style="font-size:200%;">' . $name . '</h1></b></h4></center><hr/>';
echo '<div class="col-lg-6 col-md-6">
<div class="panel panel-success">
<div class="panel-heading">
<div class="row">
<div class="col-md-12">
<center><h2>' . $start . ' (' . $name1 . ')</h2></center>
</div>
</div>
</div>
</div>
</div>';
if (!empty($end)) {
echo '<div class="col-lg-6 col-md-6">
<div class="panel panel-success">
<div class="panel-heading">
<div class="row">
<div class="col-md-12">
<center><h2>' . $end . ' (' . $name1 . ')</h2></center>
</div>
</div>
</div>
</div>
</div>';
} else {
echo '<div class="col-lg-6 col-md-6">
<div class="panel panel-default">
<div class="panel-heading">
<div class="row">
<div class="col-xs-12">
<center><h2><form method="post"><input type="submit" name="end" value="OUT" /><input type="hidden" name="id" value="' . $id . '"/></form></h2></center>
</div>
</div>
</div>
</div>
</div>';
}
}
?>
</div>
<!-- /.row -->
</div>
<!-- /#page-wrapper -->
</div>
<!-- /#wrapper -->
<!-- jQuery -->
<script src="../vendor/jquery/jquery.min.js"></script>
<!-- Bootstrap Core JavaScript -->
<script src="../vendor/bootstrap/js/bootstrap.min.js"></script>
<!-- Metis Menu Plugin JavaScript -->
<script src="../vendor/metisMenu/metisMenu.min.js"></script>
<!-- Morris Charts JavaScript -->
<script src="../vendor/raphael/raphael.min.js"></script>
<script src="../vendor/morrisjs/morris.min.js"></script>
<script src="../data/morris-data.js"></script>
<!-- Custom Theme JavaScript -->
<script src="../dist/js/sb-admin-2.js"></script>
我已经设法获取名称、开始时间、结束时间和日期以工作并进入数据库，但是第二个下拉菜单显示和添加所需信息时遇到问题。
最佳答案
可能是您的查询失败或返回了 False。您想使用 mysqli_error() 来查看实际发生的情况。放下面的代码进行检查:
if (!$result2) {
printf("Error: ", mysqli_error($con));
exit();
}
关于jquery - 下拉菜单和显示有问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40773332/