Question

我做了一个简单的表格，我将要求学生在线完成。

它包含许多将传递到mysql数据库的字段。表单工作正常，但唯一的问题是当我第一次加载页面时它试图向数据库提交任何内容（因为所有字段都是空的）并且出现了我设置的错误，表示您尚未完成必填字段

如何才能让我的页面的脚本部分仅在单击提交按钮时运行？

这是我的代码

    <! Code to check that the user has logged into to view this page !>
<?php
Code to check for session here
?>
<!Connection details for connecting to mysql database!>
<?php
Info for connection to database
 }

//Select which database you want to connect to
Code to select database here
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Op Tech Database - Add Record</title>
</head>
<!Code to Create drop down menu's!>
<?php
//Code for collectiing values for Student Names drop down drop
$result1=mysql_query("SELECT studentID, studentName FROM students");
$options1="";
while ($row=mysql_fetch_array($result1)) {

    $id=$row["studentID"];
    $first=$row["studentName"];

    $options1.="<OPTION VALUE=\"$first\">".$first.'</option>';
    }

//Code for getting tutors names in drop down list
$result2=mysql_query("SELECT staffID, tutorName FROM staff");

$options2="";
while ($row=mysql_fetch_array($result2)) {

    $id=$row["staffID"];
    $first=$row["tutorName"];

    $options2.="<OPTION VALUE=\"$first\">".$first.'</option>';
}
  ?>
<body>
<link rel="stylesheet" type="text/css" href="ex1.css" >
<link rel="stylesheet" media="only screen and (max-device-width: 1024px)" href="ipad.css" type="text/css" />
<!Create HTML elements!>
<form name="myform" form method="post">
  <h1 align="center"><a href="both.php"><img src="colour_logo_400.jpg" alt="University Logo" width="400" height="185" /></a></h1>
  <h1 align="center">Dental Hygiene Operative Technique Database</h1>
  <h2 align="center">Welcome to the Dental Hygiene Operative Technique Database v1</h2>
  <p align="left">Student Name</p>
  <p align="left">

   <! Drop Down Menu to get student names from database !>
   <SELECT NAME=studentName >
<OPTION VALUE=0>
<?php 

 echo $options1
 ?>
</SELECT>  
  <p align="left">Tutor Name  
  <p align="left"> 

  <! Drop Down Menu to get tutor names from database !>
  <select name=tutorName>
    <option value=0>

      <?php echo $options2 ?> </option> 
  </select>
  <p align="left">

<p align="left"><br>


   Procedure
  <input type="text" name="procedure"  value="<?php if(isset($_POST['procedure'])) echo $_POST['procedure'];?>" />
<p align="left">
<br>
<SELECT NAME=grade id=grade>
        <OPTION VALUE="">Grade
        <OPTION VALUE="N" <?php if (isset($_POST['grade']) && $_POST['grade'] == "N") {
      echo 'selected="selected"';} ?>>N</option>
        <OPTION VALUE="B" <?php if (isset($_POST['grade']) && $_POST['grade'] == "B") {
      echo 'selected="selected"';} ?>>B</option>
        <OPTION VALUE="C" <?php if (isset($_POST['grade']) && $_POST['grade'] == "C") {
      echo 'selected="selected"';} ?>>C</option>
        </SELECT>
        <br>
<br>
          Student Reflection:<br>
      <textarea name="studentReflection" cols="100" rows="5"><?php if(isset($_POST['studentReflection'])) echo $_POST['studentReflection'];?></textarea>
  <p align="left">
<p align="left">
<p align="left">
  <p align="left">
      <SELECT NAME=professionalism>
          <OPTION VALUE="">Professionalism
          <OPTION VALUE="U" <?php if (isset($_POST['professionalism']) && $_POST['professionalism'] == "U") {
      echo 'selected="selected"';} ?>>U</option>
        <OPTION VALUE="S" <?php if (isset($_POST['professionalism']) && $_POST['professionalism'] == "S") {
      echo 'selected="selected"';} ?>>S</option>
        <OPTION VALUE="E" <?php if (isset($_POST['professionalism']) && $_POST['professionalism'] == "E") {
      echo 'selected="selected"';} ?>>U</option>
        </SELECT>
        </SELECT>
      <SELECT NAME=communication>
        <OPTION VALUE="">Communication
        <OPTION VALUE="U" <?php if (isset($_POST['communication']) && $_POST['communication'] == "U") {
      echo 'selected="selected"';} ?>>U</option>
        <OPTION VALUE="S" <?php if (isset($_POST['communication']) && $_POST['communication'] == "S") {
      echo 'selected="selected"';} ?>>S</option>
        <OPTION VALUE="E" <?php if (isset($_POST['communication']) && $_POST['communication'] == "E") {
      echo 'selected="selected"';} ?>>U</option>
        </SELECT>

        Alert:
        <input type="checkbox" value="YES" name="alert" >  
      <br>

<br>
      Tutor Comments:<br>
      <textarea name="tutorComments" cols="100" rows="5"><?php if(isset($_POST['tutorComments'])) echo $_POST['tutorComments'];?></textarea>
  <p align="left">

      <input type="submit" value="Update Database"  /> 

  <input type='button' value='Logout' onClick="window.location.href='http://138.253.2.72/php_sandbox/optech/dh/current/14june/logout.php'">  
  <p align="left">

</FORM>
<p>  <a href="both.php">Enter another procedure </a>
<p>
  <?php
//Error Message to display if all the correct fields are not completed.
$errorMessage = "This is the standard error message";

$options1 = $_POST['studentName'];
$options2 = $_POST['tutorName'];
$procedure = $_POST['procedure'];
$grade = $_POST['grade'];
$studentReflection = $_POST['studentReflection'];
$professionalism = $_POST['professionalism'];
$communication = $_POST['communication'];
$tutorComments = $_POST ['tutorComments'];

if(empty($_POST['alert']))
{
$_POST['alert'] = "NO";
}
$alert = $_POST['alert'] ;

//Code to check that the Student Name field is completed
if(empty($_POST['studentName'])) 
{
echo "You have not selected a student. Please go back and do so!";
exit();
}
//Code to check that the Tutor Name field is completed
if(empty($_POST['tutorName'] ))
{
echo "You did not select a tutor name. Please go back and select your name from the tutors list";
exit();
}
//Code to check that the Procedure field is completed
if(empty($_POST['procedure'] ))
{
echo  "You did not select a procedure. Please go back and enter the name of the procedure which you undertook";
exit();
}
//Code to check that the Grade field is completed
if(empty($_POST['grade'] ))
{
echo "You did not select a grade. Please go back and select your grade from the drop down list";
exit();
}
//Code to check that the Student Reflection field is completed
if(empty($_POST['studentReflection'] ))
{
echo "The student did not enter any comments for this procedure. Student reflection is required for each procedure. Please go back and enter any comments";
exit();
}
//Code to check if the tick box is checked that the tutor comment is entered
if( !strlen($_POST['tutorComments']) && isset($_POST['alert']) ){
    echo "You must enter a comment on the student if you tick the alert box";
    exit();
}

//Code to connect to the database
Database connect code here


$query= "INSERT INTO entry (entryID, studentName , tutorName , procedureName , grade , studentReflection , tutorComments,  professionalism , communication , alert  ) VALUES ('NULL', '".$options1."' , '".$options2." ' , '".$procedure."' , '".$grade."' , '".$studentReflection."', '".$tutorComments."' , '".$professionalism."' , '".$communication."' , '".$alert."'  )";


mysql_query($query) or die ('Error : Something fucked up' .mysql_error());


echo "The Database Has been updated. Thanks " ;
?>
</p>
<p>&nbsp;</p>
</body>
</html>

Answer 1

如果表单发布数据，您将使用类似

的内容

If($_POST){}

将代码放在花括号中，这会检测在处理之前是否有任何数据发送到页面。但是，如果没有看到您的代码，我就无法告诉您更多其他内容。

Answer 2

仅在POST请求上运行脚本：

if ( 'POST' === $_SERVER['REQUEST_METHOD'] )
{
    // process the form data
    // print result
}
else
{
    // print form
}

Answer 3

你错过了解释PHP。在提交表单之前，无法停止脚本，因为整个脚本都已运行，结果将发送到用户浏览器。因此，您需要一些机制来仅运行脚本的某些部分。

在表单中，插入一个隐藏字段：

<input type="hidden" name="submited" value="true" />

在您的PHP代码中，在尝试获取表单的值并将其保存到数据库之前，请检查：

if(isset($_REQUEST['submited'])) {

    // your save code goes here

}

Answer 4

你可以给出姓名＆amp;提交按钮的值。说name= "submit" value ="submit"

并在点击按钮后输入您要执行的所有php代码

if($_REQUEST['submit'] =='submit' && isset($_REQUEST['submit'])){
  //php code
}

这对你很好

Php表单 - 停止脚本运行直到单击提交

4 个答案: