Question

我正在构建一个表单，以便用户可以添加自己的产品在网站上销售。 javascript应该检查是否所有字段都填写完毕，但它不起作用。为什么javascript不运行？

PHP有点复杂。该网站以不同的包装销售产品以允许批发和零售价格，因此可以为不同数量的单位提供多种定价选项。但是，如果填写了其中一个可选的定价选项或单位编号，但相应的值没有填写，我认为这会导致问题，并且除了用户错误之外没有理由发生这种情况。 / p>

为了避免这种情况，如果设置了price2，并且units2为空，我希望拒绝该表单，并且“需要为每个包选项填写单位和价格”以进行回显。对于逆和price3以及unit3也是如此。

这就是PHP应该做的事情。但是，每次都会触发第一个“if”触发，因此“你需要为每个包装选项填写单位和价格1”回应。为什么这不能正确运行？

<script>
function validproform()
{
var a=document.forms["productentry"]["pname"].value;
var b=document.forms["productentry"]["pword"].value;
var c=document.forms["productentry"]["about"].value;
var d=document.forms["productentry"]["unitabout"].value;
var e=document.forms["productentry"]["price1"].value;
var f=document.forms["productentry"]["units1"].value;
if (a==null || a=="" || b==null || b=="" || c==null || c=="" || d==null || d=="" || e==null || e=="" || f==null || f=="")
  {
  alert("Required fields are not all filled out.");
  return false;
  }
</script>

<?php
if (isset($_POST['psubmit'])) {
    if(isset($_POST['price2']) and empty($_POST['units2'])){
        echo('You need to fill out both units and prices for each package option1');
    }

    elseif(isset($_POST['units2']) and empty($_POST['price2'])){
        echo('You need to fill out both units and prices for each package option2');
    }

    elseif(isset($_POST['price3']) and empty($_POST['units3'])){
        echo('You need to fill out both units and prices for each package option3');
    }

    elseif(isset($_POST['units3']) and empty($_POST['price3'])) {
        echo('You need to fill out both units and prices for each package option4');
    }
}
?>

<form name="productentry" action="" method="post" onsubmit="return validproform()">
Product Name: <input type="text" name="pname" maxlength="30"><br>
About: <input type="text" name="about" maxlength="250"><br>
Describe your product. What is unique about it, what does it do, what sets it apart?<br>
What each unit contains: <input type="text" name="unitabout" maxlength="250"><br>
For example: Are you selling, "A bag of chips" or "A box w/ 30 bags of chips" or "a carton of 10 boxes with 30 bags of chips each." Describe what one unit contains.<br>
Price: <input type="text" name="price1" maxlength="30"><br>
Number of units: <input type="text" name="units1" maxlength="30"><br>
----
Price 2(optional): <input type="text" name="price2" maxlength="30"><br>
Number of units(optional): <input type="text" name="units2" maxlength="30"><br>
Price 3(optional): <input type="text" name="price3" maxlength="30"><br>
Number of units(optional): <input type="text" name="units3" maxlength="30"><br>

Password: <input type="password" name="pword" maxlength="30"><br>
<input type="submit" name="psubmit">
</form>

Answer 1

   Try this code:

     <?php
     if (isset($_POST['psubmit']))
        {
         if(!$_POST['price2'])
              {
           echo('You need to fill out both units and prices for each package option1');
              }
       elseif(!$_POST['units2'])
              {
             echo('You need to fill out both units and prices for each package option2');
              }
        elseif(!$_POST['price3'])
              {
            echo('You need to fill out both units and prices for each package option3');
              }

        elseif(!$_POST['price3']) 
              {
            echo('You need to fill out both units and prices for each package option4');
             }
         }
     ?>

     The !$_POST will the return if the value is FALSE.

Answer 2

再次

更新：

好的，我做了一些实验。只需单击提交按钮即可“设置”$_POST个变量。因此，即使字段为空，服务器仍然认为它是“设置”。

因此，检查变量是否具有值是正确的方法。

谁会想到我回答的第一个问题是我自己的哈哈？

以下代码比我原来的答案更好，更清晰：

elseif($_POST['price2'] != 0 and empty($_POST['units2'])){
        echo('You need to fill out the number of units corresponding to price 2.'); 
    }       
elseif($_POST['units2'] != 0 and empty($_POST['price2'])){
        echo('You need to fill out the price corresponding to your second unit option.'); 
    }
elseif($_POST['price3'] != 0 and empty($_POST['units3'])){
    echo('You need to fill out the number of units corresponding to price 3.');
    }   
elseif($_POST['units3'] != 0 and empty($_POST['price3'])) {
    echo('You need to fill out the price corresponding to your third unit option.');
    }

PHP无法使用空

2 个答案: