本文介绍了当我在淹没选项中选择未填写在meal_price输入框中的meal_name时，我的java脚本代码无法正常工作。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
我有一个java脚本代码，当我在选项框中选择meal_name时，我想用feed_price填写输入框。我的代码可能会出现问题。
下面是我的代码。
我尝试了什么：
<？php
// $ uid = $ _SESSION ['uid'];
if（isset（$ _ SESSION ['uid']））{
echo $ _SESSION ['uid'];
}
include（../ dbConfig.php）;
包括user_navigation.php;
包括../header.php;
包括../footer.php;
$ query =选择Max（meal_id）来自meal_table;
$ returnD = mysql_query（$ query）;
$ result = mysql_fetch_assoc（$ returnD）;
$ maxRows = $ result ['Max（meal_id）'];
if（空（$ maxRows））{
$ lastRow = $ maxRows = 101;
} else {
$ lastRow = $ maxRows + 1;
}
？>
<？php
//请求餐费...
$ query =选择Max（meal_id）来自meal_table;
$ returnD = mysql_query（$ query）;
$ result = mysql_fetch_assoc（$ returnD）;
$ maxRows = $ result ['Max（meal_id）'];
if（空（$ maxRows））{
$ lastRow = $ maxRows = 101;
} else {
$ lastRow = $ maxRows + 1;
}
if（isset（$ _ REQUEST ['mealRequestBtn']））{
$ requestid = $ _REQUEST ['requestid'];
$ meal_id = $ _REQUEST ['meal_id'];
$ meal_name = $ _REQUEST ['meal_name'];
$ meal_price = $ _REQUEST ['meal_price'];
$ quantity = $ _REQUEST ['quantity'];
$ request_name = $ _REQUEST ['request_name'];
$ description = $ _REQUEST ['description'];
if（！empty（$ requestid）&&！empty（$ meal_name）&&！empty（$ request_name））{
date_default_timezone_set（'Africa /内罗毕'）;
$ dt = date（y / m / d h：i：s）;
$ query = mysql_query（INSERT INTO meal_table（requestid，meal_id，meal_name，meal_price，quantity，request_name，description，requestDate）VALUES（'$ requestid'，'$ meal_id'，'$ meal_name' ， '$ meal_price'， '$数量'， '$ request_name'， '$描述'， '$ DT'））;
if（$ query）{
$ errorMsg =你成功申请了一顿饭。;
}
}
else {
$ errorMsg =请！在空白字段中输入。;
}
header（location：user_main.php）;
//include(\"requestFormeals.php）;
}
？>
<！ - < script type =text / javascript>
函数getPrice（select）{
var form = select.form;
form.meal_price.value = select.options [select.selectedIndex] .text;
form.meal_name.value = select.value;
}
< / script> - >
< script type =text / javascript>
函数Choice（）
{
x = document.getElementById（meal_price）;
y = document.getElementById（meal_name）;
x.value = y.options [y.selectedIndex] .text;
}
< / script>
< div id =page-wrapper>
< div class =row>
< div class =col-lg-12>
< h1 class =page-header>请求用餐< / h1>
< / div>
<！ - /.col-lg-12 - >
< / div>
<！ - /.row - >
< div class =row>
< div class =col-md-4 col-md-offset-4>
< div class =Register-panel panel panel-default>
<！ - div class =panel panel-default - >
< div class =panel-heading>
添加项目
< / div>
< div class =panel-body>
< div class =row>
< div class =col-lg-6>
< div class =panel-body>
< form role =formaction =>
< div class =row form-inline>
< fieldset>
< div class =form-group>
< input type =textname =requestidclass =form-controlvalue =<？php echo $ _SESSION ['uid']; ？>只读>
< / div>
< div class =form-group>
< input type =textname =meal_idclass =form-controlvalue =<？php echo $ lastRow; ？>只读>
< / div>
< div class =inputs>
< div class =form-group>
< select name =meal_namerequired autofocus onchange =meal_name（meal_name）onChange ='Choice（）;'>
< option value =>选择食物菜单< /选项>
<？php
$ query =select * from meal_menu_table;
$ res = mysql_query（$ query）或die（'错误查询'）;
while（$ row = mysql_fetch_assoc（$ res））
{
// echo< option>。$ row ['activity_name'];
echo< option value ='。 $ row ['meal_name']。 >中。 $ row ['meal_name']。 < /选项> 中;
}
？>
< / select>
< / div>
< / div>
< div class =form-group>
< input type =textname =meal_priceid =meal_priceclass =form-controlrequired autofocus placeholder =Meal_Pricereadonly>
< / div>
< div class =form-group>
< input type =textname =quantityclass =form-controlrequired autofocus placeholder =Number_of_Dishes>
< / div>
< div class =form-group>
< input type =textname =request_nameclass =form-controlrequired autofocus placeholder =Your-Name>
< / div>
< div class =form-group>
< textarea cols =35rows =3name =descriptionclass =form-controlplaceholder =Description and your location>< / textarea>
< / div>
< input type =submitname =mealRequestBtnvalue =Requestclass =btn btn-success btn-sm>
< br>
<？php
if（isset（$ errorMsg））{
？>
< div class =errorMsg><？php echo $ errorMsg; ？>< / DIV>
<？php
}
？>
< / form>
< / div>
< / div>
<！ - /.col-lg-6（嵌套） - >
< / div>
<！ - /.row（嵌套） - >
< / div>
<！ - /.panel-body - >
< / div>
<！ - /.panel - >
< / div>
<！ - /.col-lg-12 - >
< / div>
<！ - /.row - >
< / div>
<！ - / #page-wrapper - >
解决方案
i have a java script code that is suppose to fill in the input box with the meal_price when i select the meal_name in the option box.what could be the problem with my code.
Below is my code.
What I have tried:
<?php
//$uid = $_SESSION['uid'];
if(isset($_SESSION['uid'])){
echo $_SESSION['uid'];
}
include("../dbConfig.php");
include "user_navigation.php";
include "../header.php";
include "../footer.php";
$query = "Select Max(meal_id) From meal_table";
$returnD = mysql_query($query);
$result = mysql_fetch_assoc($returnD);
$maxRows = $result['Max(meal_id)'];
if(empty($maxRows)){
$lastRow = $maxRows = 101;
}else{
$lastRow = $maxRows + 1 ;
}
?>
<?php
//REQUEST FOR Meals...
$query = "Select Max(meal_id) From meal_table";
$returnD = mysql_query($query);
$result = mysql_fetch_assoc($returnD);
$maxRows = $result['Max(meal_id)'];
if(empty($maxRows)){
$lastRow = $maxRows = 101;
}else{
$lastRow = $maxRows + 1 ;
}
if (isset($_REQUEST['mealRequestBtn'])) {
$requestid = $_REQUEST['requestid'];
$meal_id = $_REQUEST['meal_id'];
$meal_name = $_REQUEST['meal_name'];
$meal_price = $_REQUEST['meal_price'];
$quantity = $_REQUEST['quantity'];
$request_name = $_REQUEST['request_name'];
$description = $_REQUEST['description'];
if(!empty($requestid) && !empty($meal_name) && !empty($request_name)){
date_default_timezone_set('Africa/Nairobi');
$dt = date("y/m/d h:i:s");
$query = mysql_query("INSERT INTO meal_table(requestid,meal_id,meal_name,meal_price,quantity,request_name,description,requestDate) VALUES('$requestid','$meal_id','$meal_name','$meal_price','$quantity','$request_name','$description','$dt')");
if ($query) {
$errorMsg = "You successfully requested for a meal.";
}
}
else{
$errorMsg = "Please! Enter in the empty field.";
}
header("location: user_main.php");
//include("requestFormeals.php");
}
?>
<!-- <script type="text/javascript">
function getPrice(select) {
var form = select.form;
form.meal_price.value = select.options[select.selectedIndex].text;
form.meal_name.value = select.value;
}
</script> -->
<script type="text/javascript">
function Choice()
{
x = document.getElementById("meal_price");
y = document.getElementById("meal_name");
x.value = y.options[y.selectedIndex].text;
}
</script>
<div id="page-wrapper">
<div class="row">
<div class="col-lg-12">
<h1 class="page-header">Request For Meals</h1>
</div>
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
<div class="row">
<div class="col-md-4 col-md-offset-4">
<div class="Register-panel panel panel-default">
<!--div class="panel panel-default"-->
<div class="panel-heading">
Add Items
</div>
<div class="panel-body">
<div class="row">
<div class="col-lg-6">
<div class="panel-body">
<form role="form" action="">
<div class="row form-inline">
<fieldset>
<div class="form-group">
<input type="text" name="requestid" class="form-control" value=<?php echo $_SESSION['uid']; ?> readonly>
</div>
<div class="form-group">
<input type="text" name="meal_id" class="form-control" value=<?php echo $lastRow; ?> readonly>
</div>
<div class="inputs">
<div class="form-group">
<select name="meal_name" required autofocus onchange= "meal_name(meal_name)" onChange='Choice();'>
<option value="">Select Food Menu</option>
<?php
$query="select * from meal_menu_table";
$res=mysql_query($query) or die('wrong query');
while($row=mysql_fetch_assoc($res))
{
//echo "<option>".$row['activity_name'];
echo "<option value='" . $row['meal_name'] . "'>" . $row['meal_name'] . "</option>";
}
?>
</select>
</div>
</div>
<div class="form-group">
<input type="text" name="meal_price" id="meal_price" class="form-control" required autofocus placeholder="Meal_Price" readonly >
</div>
<div class="form-group">
<input type="text" name="quantity" class="form-control" required autofocus placeholder="Number_of_Dishes" >
</div>
<div class="form-group">
<input type="text" name="request_name" class="form-control" required autofocus placeholder="Your-Name">
</div>
<div class="form-group">
<textarea cols="35" rows="3" name="description" class="form-control" placeholder="Description and your location"></textarea>
</div>
<input type="submit" name="mealRequestBtn" value="Request" class="btn btn-success btn-sm">
<br>
<?php
if(isset($errorMsg)){
?>
<div class="errorMsg"><?php echo $errorMsg; ?></div>
<?php
}
?>
</form>
</div>
</div>
<!-- /.col-lg-6 (nested) -->
</div>
<!-- /.row (nested) -->
</div>
<!-- /.panel-body -->
</div>
<!-- /.panel -->
</div>
<!-- /.col-lg-12 -->
</div>
<!-- /.row -->
</div>
<!-- /#page-wrapper --> 解决方案
这篇关于当我在淹没选项中选择未填写在meal_price输入框中的meal_name时，我的java脚本代码无法正常工作。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！