为什么我的消息框不起作用？

Question

I have to do 1 system that have add process and edit process. 我必须做1系统具有添加过程和编辑过程。 In these process I already put coding of message box but when I try it, I found that the message box does not work. 在这些过程中，我已经对消息框进行了编码，但是当我尝试编码时，发现消息框不起作用。 I want when user does not finish fill their information and already click submit button the message box come out. 我想在用户未完成填写信息并且已经单击“提交”按钮时出现消息框。

Can someone help me to fix this problem? 有人可以帮我解决这个问题吗？ Here is the code: 这是代码：

<?php
include("authenticationStaff.php");
include ("dbase.php");  

        $query= "SELECT * FROM staff WHERE staff_name ='".$_SESSION['SESS_STAFF_NAME']."'";
        $result = mysql_query($query);


        $row = mysql_fetch_array($result);
        $id = $row["id"];
        $staff_id=$row["staff_id"];
        @mysql_free_result($result);

        error_reporting(E_ALL);
        ini_set('display_errors', 1);
?>
<html>
<head>
<script>

function Validate()
{
    if (document.addStaff.project_name.value == '') 
    {
       alert('Please Insert Project Name!');
       document.addStaff.project_name.focus();
       return false;
    }
    if (document.addStaff.project_id.value == '') 
    {
       alert('Please Insert Project ID !');
       document.addStaff.project_id.focus();
       return false;
    }
    if (document.addStaff.location.value == '') 
    {
       alert('Please Insert Location!');
       document.addStaff.location.focus();
       return false;
    }
    if (document.addStaff.cost.value == '') 
    {
       alert('Please Insert Cost!');
       document.addStaff.cost.focus();
       return false;
    }
    if (document.addStaff.pic.value == '') 
    {
       alert('Please Insert Person In Charge!');
       document.addStaff..pic.focus();
       return false;
    }
    if (document.addStaff.detail.value == '') 
    {
       alert('Please Insert Detail about the Project!');
       document.addStaff.detail.focus();
       return false;
    }
}
</script>
</head>
<body>

<table width="869" border="0" align="center" cellpadding="0" cellspacing="0">
    <tr>
       <td width="645" height="50" align="left" valign="middle"><strong>Welcome ,&nbsp; You log in as &nbsp; &nbsp;<?php echo $_SESSION['SESS_STAFF_NAME'];?> </strong></td>
      <td width="224" align="right" valign="middle"><strong><a href="logout.html" title="Logout">Log Out</a></strong></td>
   </tr>
   </table>
   <?php
   $idURL = $_GET['id'];
   $query ="SELECT *
    FROM staff s
    JOIN inter1 i
    ON (s.staff_name=i.staff_name)";

$result = mysql_query($query, $conn) or die("Could not execute query");
$row = mysql_fetch_array($result, MYSQL_BOTH); // using numeric index or array index

    $staff_id = $row['staff_id'];
    $project_name = $row['project_name'];
    $location = $row['location'];
    $detail = $row['detail'];
    $pic = $row['pic'];
    $staff_name = $row['staff_name'];
    $project_id = $row['project_id'];


    @mysql_free_result ($result);
?>
   <center>
  <form action="addStaff_process.php?id=<?php echo $idURL; ?>" method="post" enctype="multipart/form-data" name="add_process" id="add_process" onsubmit="return Validate()" >
  <table border="1" width="70%" cellspacing="1" cellpadding="6" >
  <tr align="center" bgcolor="">
      <td   align="left"  style="padding:10px 10px 10px 10px;" >STAFF NAME:</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="staff_name" cols="50" rows="2" id="staff_name"><?php echo $_SESSION['SESS_STAFF_NAME'];?></textarea></td>
    </tr>
    <tr align="center" bgcolor="">
      <td   align="left"  style="padding:10px 10px 10px 10px;" >STAFF ID:</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="staff_id" cols="50" rows="2" id="staff_id"><?php echo $idURL; ?></textarea></td>
    </tr>
  <tr align="center" bgcolor="">
      <td   align="left"  style="padding:10px 10px 10px 10px;" >PROJECT ID:</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="project_id" cols="50" rows="2" id="project_id"></textarea></td>
    </tr>
    <tr align="center" bgcolor="">
      <td   align="left"  style="padding:10px 10px 10px 10px;" >PROJECT NAME :</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="project_name" cols="50" rows="2" id="project_name"></textarea></td>
    </tr>
    <tr align="center" bgcolor="">
      <td   align="left"  style="padding:10px 10px 10px 10px;" >LOCATION :</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="location" cols="50" rows="2" id="location"></textarea></td>
    </tr>
    <tr align="center" bgcolor="">
      <td   align="left"  style="padding:10px 10px 10px 10px;" > COST :</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="cost" cols="50" rows="2" id="cost"></textarea></td>
    </tr>
    <tr align="center" bgcolor="" >
      <td   align="left"  style="padding:10px 10px 10px 10px;" >PERSON IN CHARGE :</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="pic" cols="50" rows="3" id="pic"></textarea></td>
    </tr>
    <tr>
      <td   align="left"  style="padding:10px 10px 10px 10px;">DETAIL ABOUT THE PROJECT:</td>
      <td  align="left"  style="padding:10px 10px 10px 10px;" ><textarea name="detail" cols="50" rows="4" id="detail"></textarea></td>
    </tr>
        </table>
        <p>&nbsp;</p>
        <p>
          <input class="form-submit" type="submit" name="submit" value="SUBMIT" onclick="return Validate()"/>
          <input type = "reset" value = "RESET" />
        </p>
  </form>
</center>

</body>
</html>

Answer 1

addStaff is a not a property or method of the document object. addStaff不是document对象的属性或方法。 Therefore, your conditional tests are going to fail every time and none of the code in your if statements will run. 因此，条件测试每次都会失败，并且if语句中的任何代码都不会运行。

I believe you are looking for something along the lines of: 我相信您正在寻找以下方面的东西：

if (document.getElementById("project_name").value == "") {
    //Your error handling code...
}

为什么我的消息框不起作用？

问题描述

1 个解决方案

解决方案1
0 2014-05-12 02:15:55

为什么我的消息框不起作用？

问题描述

1 个解决方案

解决方案1 0 2014-05-12 02:15:55

解决方案1
0 2014-05-12 02:15:55