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javascript - 如何在不用ajax的前提下实现库存减少？

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Jun 06, 2016 pm 08:22 PM

htmljavascriptphp

请忽略界面和库存的数量（仅供测试使用），本人初学者
javascript - 如何在不用ajax的前提下实现库存减少？

如图所示，题主想实现的功能如下：
在AllItems.php单击查看详情，跳转到Test.php
Test.php是商品详情页面，用户输入购买数量，单击ok实现数据库库存的减少

Test.php代码如下

<code>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">


<form action="#" method="post" onsubmit="check()">   
<input type="text" name="num" id="num">
<input type="submit" value="ok">
</form>
<script type="text/javascript">
    function check(){
        </script>
<?php mysql_connect("localhost","root","") or die(mysql_error());  
    mysql_select_db("user_info");  
    $number = $_POST["num"];
    $sql="select * from inventory where pid = '1'";  
    $sql2 = "update inventory set pnum = pnum-'$number' where pid = '1' ";
    $query=mysql_query($sql); 
    $query2=mysql_query($sql2);
    $result = mysql_fetch_array($query);  
    @$pnum = $result['pnum'];   
if (isset($_POST["num"])&&$_POST["num"]!=""&&$_POST["num"]<=$pnum){
    echo "<script>alert('添加成功')";
}else if(isset($_POST["num"])&&$_POST["num"]!=""&&$_POST["num"]>$pnum){
    echo "<script>alert('illegal input')</script>";
}else{

}

?>
<script type="text/javascript">
}
        </script>



</code>

目前有以下几个问题，
1.每次进入页面都会输出illegal input，我知道这与执行顺序有关，但是是否有某种方式控制这段代码的执行，比如isset？
2.目前已经可以实现库存按照用户输入减少，但是判断用户输入合法性（忽略字符之类）只比较用户输入与库存大小，这个功能并不能实现，请求指教。
再次声明我是初学者

回复内容：

请忽略界面和库存的数量（仅供测试使用），本人初学者
javascript - 如何在不用ajax的前提下实现库存减少？

Test.php代码如下

<code>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">


<form action="#" method="post" onsubmit="check()">   
<input type="text" name="num" id="num">
<input type="submit" value="ok">
</form>
<script type="text/javascript">
    function check(){
        </script>
<?php mysql_connect("localhost","root","") or die(mysql_error());  
    mysql_select_db("user_info");  
    $number = $_POST["num"];
    $sql="select * from inventory where pid = '1'";  
    $sql2 = "update inventory set pnum = pnum-'$number' where pid = '1' ";
    $query=mysql_query($sql); 
    $query2=mysql_query($sql2);
    $result = mysql_fetch_array($query);  
    @$pnum = $result['pnum'];   
if (isset($_POST["num"])&&$_POST["num"]!=""&&$_POST["num"]<=$pnum){
    echo "<script>alert('添加成功')";
}else if(isset($_POST["num"])&&$_POST["num"]!=""&&$_POST["num"]>$pnum){
    echo "<script>alert('illegal input')</script>";
}else{

}

?>
<script type="text/javascript">
}
        </script>



</code>

就标题而言，减少库存需要在前端表现出来以及把数据同步到服务端，ajax是一个很好的选择

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