Question

我对PHP有点新意，我在这里和那里遇到了一些困难。我正在开发一个表单，并希望在按下＆＃39;提交＆＃39; 按钮时，如果任何字段为空，则显示错误框。我尝试过以下代码，但回声仍然没有出现。有什么建议吗？

表格代码：

<div style="padding-top:40px">
    <div style="text-center; padding-right:25%; padding-left:25%">
        <div class="form-area">  
            <form role="form" method="$_POST" action="searchEmployee.php">
            <br style="clear:both">
                <h3 style="margin-bottom:25px; text-align: center;">Visitor Form</h3>
                <div class="form-group">
                    <label>Name:</label>
                    <input type="text" class="form-control" id="name" name="name" placeholder="Name" required>
                </div>
                <div class="form-group">
                     <label>Surname:</label>
                    <input type="text" class="form-control" id="surname" name="surname" placeholder="Surname" required>
                </div>
                <div class="form-group">  
                    <label>ID Card:</label>
                    <input type="text" class="form-control" id="idCard" name="idCard" placeholder="ID Card No" required>
                </div>
                <div class="form-group">  
                    <label>Visitor Card Number:</label>
                    <input type="text" class="form-control" id="cardNumber" name="cardNumber" placeholder="Card No" required>
                </div>
                <div class="form-group">  
                    <intput type="button" id="submit" name="submit" class="btn btn-primary pull-right">Sign In Visitor</button>
                </div>
            </form>
        </div>
    </div>
</div>

PHP代码：

<?php
        if (isset($_POST['submit'])) {
            $required = array('name', 'surname', 'ID', 'visitorCard');

            // Loop over field names, make sure each one exists and is not empty
            $error = false;
            foreach($required as $field) {
                if (empty($_POST[$field])) {
                $error = true;
                }
            }

            if ($error) {
                echo "All fields are required.";
            }
        }
        ?>

Answer 1

您在表单属性中使用方法$_POST，
它应该只有POST。

因此，请用

替换您的表单行

<form role="form" method="POST" action="searchEmployee.php">

并且还将提交按钮行更改为，

<input type="submit" name="submit" value="Sign In Visitor" class="btn btn-primary pull-right" />

Answer 2

以下是一些错误：

您在表单属性中使用方法$_POST，它应该只是POST。

您的表单不会提交，因为您的按钮不是提交类型。它应该

<input type="submit" id="submit" name="submit" class="btn btn-primary pull-right" value="Sign In Visitor" />

或者

<button type="submit" id="submit" name="submit" class="btn btn-primary pull-right">Sign In Visitor</button>

Answer 3

更改此

<intput type="button" id="submit" name="submit" class="btn btn-primary pull-right">Sign In Visitor</button>

要

<input type="button" id="submit" name="submit" value="submit" class="btn btn-primary pull-right" />Sign In Visitor

还有这个

<form role="form" method="$_POST" action="searchEmployee.php">

要

<form role="form" method="POST" action="searchEmployee.php">

如果你甚至没有设置，你将如何得到POST['submit']值，这意味着你的if代码不会执行它，所以它不会回应或提醒它。对于调试的最佳实践，只要在编码时发生此类实例，就始终尝试执行此操作。

print_r($_POST);

这将显示一系列POST变量

Answer 4

您需要进行2次更改

像这样更改按钮类型

<input type="submit" id="submit" name="submit" class="btn btn-primary pull-right" value="Sign In Visitor">

更改表单方法

<form role="form" method="POST" action="searchEmployee.php">

Answer 5

将$_POST更改为POST并将<input type="submit"代替<input type = "button"

Answer 6

首先考虑更改按钮type="submit"。

第二个想改变PHP数组

$required = array('name', 'surname', 'idCard', 'cardNumber');

Answer 7

var countries= document.getElementById("countries").getContext("2d");
var pieData = 
{
    labels: ['India', 'Germany', 'Netherland'],
    datasets: [{
      backgroundColor: '#337ab7',
      data: ['100', '99' ,'98'],
      borderWidth:1,
      }]
};
var pieOptions = 
{
    responsive: true,
    maintainAspectRatio:false,
    legend: {
      display: false,
      position: 'top'
    }
};

var chart = new Chart(countries,{    
type: 'pie',
data: pieData,
options: pieOptions
});

Php Code ::: searchEmployee.php

    <div style="padding-top:40px"> 
<div style="text-center; padding-right:25%; padding-left:25%"> 
<div class="form-area"> 

<form role="form" method="post" action="searchEmployee.php"> <br style="clear:both"> <h3 style="margin-bottom:25px; text-align: center;">Visitor Form</h3> <div class="form-group"> <label>Name:</label> 
<input type="text" class="form-control" id="name" name="name" placeholder="Name" required> </div>
 <div class="form-group"> <label>Surname:</label> 
<input type="text" class="form-control" id="surname" name="surname" placeholder="Surname" required> </div> <div class="form-group"> <label>ID Card:</label> 
<input type="text" class="form-control" id="idCard" name="idCard" placeholder="ID Card No" required> 
</div> 
<div class="form-group">
 <label>Visitor Card Number:</label> <input type="text" class="form-control" id="cardNumber" name="cardNumber" placeholder="Card No" required>
 </div> <div class="form-group"> 
<input type="submit" id="submit" name="submit" class="btn btn-primary pull-right" value="Sign In Visitor">
</div> </form> </div> 
</div> </div>

PHP：Echo没有从表单上处理POST方法

7 个答案: