如何传递一个php变量从下拉到另一个下拉使用php？ [英] How to pass a php variable from a dropdown to another dropdown using php?
本文介绍了如何传递一个php变量从下拉到另一个下拉使用php？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
< body>
< div id =wrapper>
<！ - 导航 - >
< nav class =navbar navbar-default navbar-static-toprole =navigationstyle =margin-bottom：0>
< div class =navbar-header>
< button type =buttonclass =navbar-toggledata-toggle =collapsedata-target =。navbar-collapse>
< span class =sr-only>切换导航< / span>
< span class =icon-bar>< / span>
< span class =icon-bar>< / span>
< span class =icon-bar>< / span>
< / button>
< a class =navbar-brandhref =index.php>学生日程安排系统< / a>
< / div>
<！ - /.navbar-header - >
< div class =navbar-default sidebarrole =navigation>
< div class =sidebar-nav navbar-collapse>
< ul class =navid =side-menu>
< li>
< a href =index.php>< i class =fa fa-home fa-fw>< / i>首页< / a>
< / li>
< li>
< a href =student.php>< i class =fa fa-users fa-fw>< / i>学生< / a>
< / li>
< li>
< a href =coourses.php>< i class =fa fa-university fa-fw>< / i>课程< / a>
< / li>
< li>
< a href =subject.php>< i class =fa fa-archive fa-fw>< / i>主题< / a>
< / li>
< / ul>
< / div>
<！ - /.sidebar-collapse - >
< / div>
<！ - /.navbar-static-side - >
< / nav>
<！ - 页面内容 - >
< div id =page-wrapper>
< div class =container-fluid>
< div class =row>
< div class =col-lg-12>
< h3 class =page-header>学生< / h3>
< div class =panel panel-primary>
< div class =panel-heading>
学生列表
< / div>
<！ - /.panel-heading - >
< div class =panel-body>
< div class =table-responsive>
< table class =table table-striped table-hoverid =dataTables-example>
< thead>
< tr>
< th>学生ID< / th>
< th>名字< / th>
< th>姓氏< / th>
< th>课程< / th>
< th>年< / th>
< th>部分< / th>
< th>节ID< / th>
< / tr>
< / thead>
< tbody>
<？php
// PHP数据库连接的五个步骤：
// 1.创建数据库连接
/ / $使用你自己的服务器名，用户名和密码，如果他们是不同的）
// $连接允许我们在建立后继续引用这个连接
$ connection = mysql_connect（localhost，根，）;
if（！$ connection）{
die（Database connection failed：。mysql_error（））;
}
// 2.选择要使用的数据库
$ db_select = mysql_select_db（studsystem，$ connection）;
if（！$ db_select）{
die（Database selection failed：。mysql_error（））;
}
？>
<？php
$ result = mysql_query（Select tbl_course.studno，tbl_course.studfname，tbl_course.studlname，
tbl_coursetype.course_desc，tblyear.YearName，tblset.setname ，tblset.ID
来自tbl_course，tbl_coursetype，tblyear，tblset
其中tbl_coursetype.course_no = tbl_course.studcourse
和tblyear.ID = tbl_course.studyear
和tblset.ID = tbl_course .studset，$ connection）;
if（！$ result）{
die（Database query failed：。mysql_error（））;
}
// 4.使用返回的数据
while（$ row = mysql_fetch_array（$ result））{
echo< tr class = \ success \>;
echo< td>。$ row [0]。< / td>;
echo< td>。$ row [1]。< / td>;
echo< td>。$ row [2]。< / td>;
echo< td>。$ row [3]。< / td>;
echo< td>。$ row [4]。< / td>;
echo< td>。$ row [5]。< / td>;
echo< td>。$ row [6]。< / td>;
echo< td>< a href = \viewsubject.php？cours = {$ row [3]}& year = {$ row [4]}& set = {$ row [ 5]}& section = {$ row [6]} \class = \btn btn-info btn-xs\>查看主题< / a>< / td&
echo< td>< a href = \update_stud.php？studno = {$ row [0]}& studfname = {$ row [1]}& studlname = {$ row [ 2]}& studcourse = {$ row [3]} \>< i class = \fa fa-edit\>< / i>< / a>< / td> ;;
echo< td>< a href = \delete_stud.php？studno = {$ row [0]} \>< i class = \fa fa-trash-o \>< / i>< / a>< / td>;
echo< / tr>;
}
？>
<？php
mysql_close（$ connection）;
？>
< / tbody>
< / table>
< / div>
<！ - /.table-responsive - >
< / div>
<！ - /.panel-body - >
< / div>
<！ - Button trigger modal - >
< button type =buttonclass =btn btn-primarydata-toggle =modaldata-target =＃myModal>
添加学生
< / button>
<！ - Modal - >
< div class =modal fadeid =myModaltabindex = - 1role =dialogaria-labelledby =myModalLabelaria-hidden =true
< div class =modal-dialog>
< div class =modal-content>
< div class =modal-header>
< button type =buttonclass =closedata-dismiss =modalaria-label =关闭>< span aria-hidden =true>& times; ; / span>< / button>
< h4 class =modal-titleid =myModalLabel>添加新学生< / h4>
< / div>
< div class =modal-body>
< form role =formaction =save_stud.phpmethod =post>
< div class =form-group>
< label>名字< / label>
< input type =textname =studfnameclass =form-controlrequired>
< / div>
< div class =form-group>
< label>姓氏< / label>
< input type =textname =studlnameclass =form-controlrequired>
< / div>
< div class =form-group>
< label>学生课程< / label>
< select name =studcourseclass =form-control>
<？php
// PHP数据库连接的五个步骤：
// 1.创建数据库连接
//自己的服务器名，用户名和密码，如果他们是不同的。）
// $连接允许我们在建立后继续引用这个连接
$ connection = mysql_connect（localhost，root ）;
if（！$ connection）{
die（Database connection failed：。mysql_error（））;
}
// 2.选择要使用的数据库
$ db_select = mysql_select_db（studsystem，$ connection）;
if（！$ db_select）{
die（Database selection failed：。mysql_error（））;
}
？>
<？php
$ result = mysql_query（Select setcours，course_desc
from tblset，tbl_coursetype
其中tbl_coursetype.course_no = tblset.setcours
group by setcours，$ connection）;
if（！$ result）{
die（Database query failed：。mysql_error（））;
}
// 4.使用返回的数据
while（$ row = mysql_fetch_array（$ result））{
echo< option value = \{$ row [0]} \> {$ row [1]}< / option>;
}
？>
< / select>
< / div>
< div class =form-group>
< label>学生年< / label>
< select name =studyearclass =form-control>
<？php
// PHP数据库连接的五个步骤：
// 1.创建数据库连接
//自己的服务器名，用户名和密码，如果他们不同）
// $连接允许我们在建立后继续引用这个连接
$ connection = mysql_connect（localhost，root， ）;
if（！$ connection）{
die（Database connection failed：。mysql_error（））;
}
// 2.选择要使用的数据库
$ db_select = mysql_select_db（studsystem，$ connection）;
if（！$ db_select）{
die（Database selection failed：。mysql_error（））;
}
？>
<？php
$ result = mysql_query（Select setyear，YearName
from tblset，tblyear
其中tblyear.ID = tblset.setyear
group by setyear，$ connection）;
if（！$ result）{
die（Database query failed：。mysql_error（））;
}
// 4.使用返回的数据
while（$ row = mysql_fetch_array（$ result））{
echo< option value = \{$ row [ 0]} \> {$ row [1]}< / option>;
}
？>
< / select>
< / div>
< div class =form-group>
< label>部分< / label>
< select name =studsetclass =form-control>
<？php
// PHP数据库连接的五个步骤：
// 1.创建数据库连接
//自己的服务器名，用户名和密码，如果他们是不同的。）
// $连接允许我们在建立后继续引用这个连接
$ connection = mysql_connect（localhost，root ）;
if（！$ connection）{
die（Database connection failed：。mysql_error（））;
}
// 2.选择要使用的数据库
$ db_select = mysql_select_db（studsystem，$ connection）;
if（！$ db_select）{
die（Database selection failed：。mysql_error（））;
}
？>
<？php
$ result = mysql_query（SELECT * FROM tblset t LIMIT 0,1000，$ connection）;
if（！$ result）{
die（Database query failed：。mysql_error（））;
}
// 4.使用返回的数据
while（$ row = mysql_fetch_array（$ result））{
echo< option value = \ {$ row [0]} \> {$ row [1]}< / option>;
}
？>
< / select>
< / div>
< / div>
< div class =modal-footer>
< button type =buttonclass =btn btn-defaultdata-dismiss =modal>关闭< / button>
< input type =submitvalue =保存更改class =btn btn-primaryclass =form-control>
< / div>
< / form>
< / div>
< / div>
< / div>
<！ - Modal - >
<！ - /.col-lg-12 - >
< / div>
<！ - /.row - >
< / div>
<！ - /.container-fluid - >
< / div>
<！ - /＃page-wrapper - >
< / div>
<！ - /＃wrapper - >
< / body>
-Above是整个代码。下面是截图。
我很困惑，因为BSIT只有第一年的水平，但是每当我选择BSIT，第二个下拉菜单也会出现第三年级，这是第三年只打算BSED。简而言之，我希望每当我选择一门课程时，它会自动更改第二个下拉菜单及其相应的年级。我很抱歉这样，但我只想知道是否可能和如何？请教我，如果它与你没关系。感谢！
解决方案
像我在评论中建议的，您可以使用 chainedjs ，或者您可以创建自己的函数：
$（document）.ready（function（）{$（'＃select1'）。on（change，function（）{var selectedClass = $（this）.val（）; //存储选择的值$ ＃select2'）。val（）; //清除第二个下拉选择值//现在循环通过第二个下拉列表，隐藏不需要的选项$（'＃select2 option'）。 $（this）.attr（'class'）; if（selectedClass！= newValue&& selectedClass！=）{$（this）.hide（）;} else {$（this）.show }}）;}）;}）;
script src =https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js>< / script>< select id =select1> < option value =>< / option> < option value =number1> number 1< / option> < option value =number2> number 2< / option>< / select>< select id =select2> < option class =>< / option> < option class =number1> number 1.1< / option> < option class =number2>数字2.1< / option> < option class =number1> number 1.2< / option> < option class =number2> number 2.3< / option> < option class =number1> number 1.3< / option> < option class =number1> number 1.2< / option>< / select>
$ b
<body>
<div id="wrapper">
<!-- Navigation -->
<nav class="navbar navbar-default navbar-static-top" role="navigation" style="margin-bottom: 0">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="index.php">Student Scheduling System</a>
</div>
<!-- /.navbar-header -->
<div class="navbar-default sidebar" role="navigation">
<div class="sidebar-nav navbar-collapse">
<ul class="nav" id="side-menu">
<li>
<a href="index.php"><i class="fa fa-home fa-fw"></i> Home</a>
</li>
<li>
<a href="student.php"><i class="fa fa-users fa-fw"></i> Student</a>
</li>
<li>
<a href="coourses.php"><i class="fa fa-university fa-fw"></i> Courses</a>
</li>
<li>
<a href="subject.php"><i class="fa fa-archive fa-fw"></i> Subjects</a>
</li>
</ul>
</div>
<!-- /.sidebar-collapse -->
</div>
<!-- /.navbar-static-side -->
</nav>
<!-- Page Content -->
<div id="page-wrapper">
<div class="container-fluid">
<div class="row">
<div class="col-lg-12">
<h3 class="page-header">Student</h3>
<div class="panel panel-primary">
<div class="panel-heading">
Student List
</div>
<!-- /.panel-heading -->
<div class="panel-body">
<div class="table-responsive">
<table class="table table-striped table-hover" id="dataTables-example">
<thead>
<tr>
<th>Student ID</th>
<th>First Name</th>
<th>Last Name</th>
<th>Course</th>
<th>Year</th>
<th>Section</th>
<th>Section ID</th>
</tr>
</thead>
<tbody>
<?php
// Five steps to PHP database connections:
// 1. Create a database connection
// (Use your own servername, username and password if they are different.)
// $connection allows us to keep refering to this connection after it is established
$connection = mysql_connect("localhost","root","");
if (!$connection) {
die("Database connection failed: " . mysql_error());
}
// 2. Select a database to use
$db_select = mysql_select_db("studsystem",$connection);
if (!$db_select) {
die("Database selection failed: " . mysql_error());
}
?>
<?php
$result = mysql_query("Select tbl_course.studno, tbl_course.studfname, tbl_course.studlname,
tbl_coursetype.course_desc, tblyear.YearName, tblset.setname, tblset.ID
from tbl_course, tbl_coursetype, tblyear, tblset
where tbl_coursetype.course_no=tbl_course.studcourse
AND tblyear.ID=tbl_course.studyear
AND tblset.ID=tbl_course.studset", $connection);
if (!$result) {
die("Database query failed: " . mysql_error());
}
// 4. Use returned data
while ($row = mysql_fetch_array($result)) {
echo "<tr class=\"success\">";
echo "<td>".$row[0]."</td>";
echo "<td>".$row[1]."</td>";
echo "<td>".$row[2]."</td>";
echo "<td>".$row[3]."</td>";
echo "<td>".$row[4]."</td>";
echo "<td>".$row[5]."</td>";
echo "<td>".$row[6]."</td>";
echo "<td><a href=\"viewsubject.php?cours={$row[3]}&year={$row[4]}&set={$row[5]}§ion={$row[6]}\" class=\"btn btn-info btn-xs\">View Subject</a></td>";
echo "<td><a href=\"update_stud.php?studno={$row[0]}&studfname={$row[1]}&studlname={$row[2]}&studcourse={$row[3]}\"><i class=\"fa fa-edit\"></i></a></td>";
echo "<td><a href=\"delete_stud.php?studno={$row[0]}\"><i class=\"fa fa-trash-o\"></i></a></td>";
echo "</tr>";
}
?>
<?php
mysql_close($connection);
?>
</tbody>
</table>
</div>
<!-- /.table-responsive -->
</div>
<!-- /.panel-body -->
</div>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
Add Student
</button>
<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Add new student</h4>
</div>
<div class="modal-body">
<form role="form" action="save_stud.php" method="post">
<div class="form-group">
<label>First Name</label>
<input type="text" name="studfname" class="form-control" required>
</div>
<div class="form-group">
<label>Last Name</label>
<input type="text" name="studlname" class="form-control" required>
</div>
<div class="form-group">
<label>Student Course</label>
<select name="studcourse" class="form-control">
<?php
// Five steps to PHP database connections:
// 1. Create a database connection
// (Use your own servername, username and password if they are different.)
// $connection allows us to keep refering to this connection after it is established
$connection = mysql_connect("localhost","root","");
if (!$connection) {
die("Database connection failed: " . mysql_error());
}
// 2. Select a database to use
$db_select = mysql_select_db("studsystem",$connection);
if (!$db_select) {
die("Database selection failed: " . mysql_error());
}
?>
<?php
$result = mysql_query("Select setcours, course_desc
from tblset, tbl_coursetype
where tbl_coursetype.course_no=tblset.setcours
group by setcours", $connection);
if (!$result) {
die("Database query failed: " . mysql_error());
}
// 4. Use returned data
while ($row = mysql_fetch_array($result)) {
echo "<option value=\"{$row[0]}\">{$row[1]}</option>";
}
?>
</select>
</div>
<div class="form-group">
<label>Student Year</label>
<select name="studyear" class="form-control">
<?php
// Five steps to PHP database connections:
// 1. Create a database connection
// (Use your own servername, username and password if they are different.)
// $connection allows us to keep refering to this connection after it is established
$connection = mysql_connect("localhost","root","");
if (!$connection) {
die("Database connection failed: " . mysql_error());
}
// 2. Select a database to use
$db_select = mysql_select_db("studsystem",$connection);
if (!$db_select) {
die("Database selection failed: " . mysql_error());
}
?>
<?php
$result = mysql_query("Select setyear, YearName
from tblset, tblyear
where tblyear.ID=tblset.setyear
group by setyear", $connection);
if (!$result) {
die("Database query failed: " . mysql_error());
}
// 4. Use returned data
while ($row = mysql_fetch_array($result)) {
echo "<option value=\"{$row[0]}\">{$row[1]}</option>";
}
?>
</select>
</div>
<div class="form-group">
<label>Section</label>
<select name="studset" class="form-control">
<?php
// Five steps to PHP database connections:
// 1. Create a database connection
// (Use your own servername, username and password if they are different.)
// $connection allows us to keep refering to this connection after it is established
$connection = mysql_connect("localhost","root","");
if (!$connection) {
die("Database connection failed: " . mysql_error());
}
// 2. Select a database to use
$db_select = mysql_select_db("studsystem",$connection);
if (!$db_select) {
die("Database selection failed: " . mysql_error());
}
?>
<?php
$result = mysql_query("SELECT * FROM tblset t LIMIT 0,1000", $connection);
if (!$result) {
die("Database query failed: " . mysql_error());
}
// 4. Use returned data
while ($row = mysql_fetch_array($result)) {
echo "<option value=\"{$row[0]}\">{$row[1]}</option>";
}
?>
</select>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<input type="submit" value="Save Changes" class="btn btn-primary" class="form-control">
</div>
</form>
</div>
</div>
</div>
<!--Modal-->
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
</div>
<!-- /.container-fluid -->
</div>
<!-- /#page-wrapper -->
</div>
<!-- /#wrapper -->
</body>
-Above is the whole code. And below are the screenshots.
I am confused because BSIT has only 1st year level but when everytime I choose BSIT, the second dropdown will also appear 3rd year level, which is 3rd year is only intended for BSED. In short, I want that when everytime I choose a course, it will automatically change the second dropdown menu with its corresponding year level/s. I am sorry for this, but I just want to know if it is possible and how? Please teach me if it is okay with you. Thanks!
解决方案
Like I suggested in the comments, you can use chainedjs for this, or you can create your own function like:
$( document ).ready(function() {
$('#select1').on("change", function(){
var selectedClass = $(this).val(); //store the selected value
$('#select2').val(""); //clear the second dropdown selected value
//now loop through the 2nd dropdown, hide the unwanted options
$('#select2 option').each(function () {
var newValue = $(this).attr('class');
if (selectedClass != newValue && selectedClass != "") {
$(this).hide();
}
else{$(this).show(); }
});
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<select id="select1">
<option value=""></option>
<option value="number1">number 1</option>
<option value="number2">number 2</option>
</select>
<select id="select2">
<option class=""></option>
<option class="number1">number 1.1</option>
<option class="number2">number 2.1</option>
<option class="number1">number 1.2</option>
<option class="number2">number 2.3</option>
<option class="number1">number 1.3</option>
<option class="number1">number 1.2</option>
</select>
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