0

在下面的代码中，我有两种类型的验证。我使用 javascript 验证，当用户没有从“课程”下拉菜单中选择课程时，它会显示错误消息。

然后我有一个 php 验证，如果它不包含查询结果的行，那么它会显示一条消息，指出没有找到任何评估。

我遇到的问题是，如果用户没有从“课程”下拉菜单中选择课程并且他们点击提交按钮，它会同时显示 javascript 验证和 php 验证。

这是不正确的，应该发生的是：

  • 如果用户没有选择课程，那么它应该只显示 javascript 验证而不是 php 验证。

    • 如果用户从下拉菜单中选择了一门课程并提交了表单，但随后无法从查询中找到任何结果，那么它应该显示 php 验证。

我的问题是我需要在代码中进行哪些更改才能不能同时显示两个验证消息，并且在应该显示正确的验证消息时只显示它们？

Javascript

function validation() {

    var isDataValid = true;

    var courseTextO = document.getElementById("coursesDrop");
    var moduleTextO = document.getElementById("modulesDrop");

    var errModuleMsgO = document.getElementById("moduleAlert");

    if (courseTextO.value == "") {
        $('#targetdiv').hide();
        $('#assessmentForm').hide();
        $('#updateForm').hide();
        $('#submitupdatebtn').hide();
        errModuleMsgO.innerHTML = "Please Select a Course";
        isDataValid = false;
    } else {
        errModuleMsgO.innerHTML = "";
    }
    return isDataValid;

}​

PHP/HTML

<?php

// connect to the database
include('connect.php');


/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    die();
}


$sql = "SELECT CourseId, CourseNo, CourseName FROM Course ORDER BY CourseId"; 

$sqlstmt=$mysqli->prepare($sql);

$sqlstmt->execute(); 

$sqlstmt->bind_result($dbCourseId, $dbCourseNo, $dbCourseName);

$courses = array(); // easier if you don't use generic names for data 

$courseHTML = "";  
$courseHTML .= '<select name="courses" id="coursesDrop">' . PHP_EOL; 
$courseHTML .= '<option value="">Please Select</option>' . PHP_EOL;  

$outputcourse = "";

while($sqlstmt->fetch()) 
{

    $course = $dbCourseId;
    $courseno = $dbCourseNo;
    $coursename = $dbCourseName; 

    $courseHTML .= "<option value='" . $course . "'>" . $courseno . " - " . $coursename . "</option>" . PHP_EOL;  

    if (isset($_POST['courses']) && ($_POST['courses'] == $course)) {
        $outputcourse = "<p><strong>Course:</strong> " . $courseno .  " - "  . $coursename . "</p>";
    }

} 

$courseHTML .= '</select>'; 

?>

<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post" onsubmit="return validation();">
    <table>
        <tr>
            <th>Course: <?php echo $courseHTML; ?></th>
        </tr>
    </table>
    <p>
        <input id="moduleSubmit" type="submit" value="Submit Course and Module" name="moduleSubmit" />
    </p>
    <div id="moduleAlert"></div>
    <div id="targetdiv"></div>
</form>


<?php

if (isset($_POST['moduleSubmit'])) {    

    $sessionquery = "
    SELECT SessionId, SessionName, SessionDate, SessionTime, CourseId, SessionActive
    FROM Session
    WHERE (CourseId = ? AND SessionActive = ?)
    ORDER BY SessionName 
    ";

    $active = 1;

    $sessionqrystmt=$mysqli->prepare($sessionquery);
    // You only need to call bind_param once
    $sessionqrystmt->bind_param("si",$course, $active);
    // get result and assign variables (prefix with db)

    $sessionqrystmt->execute(); 

    $sessionqrystmt->bind_result($dbSessionId,$dbSessionName,$dbSessionDate,$dbSessionTime, $dbCourseId, $dbSessionActive);

    $sessionqrystmt->store_result();

    $sessionnum = $sessionqrystmt->num_rows();   

    if($sessionnum == 0) {
        echo "<p><span style='color: red'>Sorry, You have No Assessments under this Module</span></p>";
    } 
    else 
    { 
        echo "";
    }

    ...

}
?>
4

1 回答 1

1

你可以替换

if (isset($_POST['moduleSubmit']))

经过

if (isset($_POST['coursesDrop']) && $_POST['coursesDrop']!="")

这样你就可以防止 php 在不需要时发出请求，那就是如果你想做验证服务器端。

如果您想阻止单击提交按钮时提交表单（客户端），

您可以在提交按钮上替换onsubmit="return validation();"为。onclick="validation();"如果数据通过验证调用$("#yourForm").submit()。

编辑在这里，您将根据要求找到完整的代码

JAVASCRIPT

function validation() {

    var isDataValid = true;

    var courseTextO = document.getElementById("coursesDrop");
    var moduleTextO = document.getElementById("modulesDrop");

    var errModuleMsgO = document.getElementById("moduleAlert");

    if (courseTextO.value == "") {
        $('#targetdiv').hide();
        $('#assessmentForm').hide();
        $('#updateForm').hide();
        $('#submitupdatebtn').hide();
        errModuleMsgO.innerHTML = "Please Select a Course";
        isDataValid = false;
    } else {
        errModuleMsgO.innerHTML = "";
    }

    if(isDataValid){
        $("#myForm").submit();
    }

}​

PHP HTML 

// connect to the database
include('connect.php');


/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    die();
}


$sql = "SELECT CourseId, CourseNo, CourseName FROM Course ORDER BY CourseId"; 

$sqlstmt=$mysqli->prepare($sql);

$sqlstmt->execute(); 

$sqlstmt->bind_result($dbCourseId, $dbCourseNo, $dbCourseName);

$courses = array(); // easier if you don't use generic names for data 

$courseHTML = "";  
$courseHTML .= '<select name="courses" id="coursesDrop">' . PHP_EOL; 
$courseHTML .= '<option value="">Please Select</option>' . PHP_EOL;  

$outputcourse = "";

while($sqlstmt->fetch()) 
{

    $course = $dbCourseId;
    $courseno = $dbCourseNo;
    $coursename = $dbCourseName; 

    $courseHTML .= "<option value='" . $course . "'>" . $courseno . " - " . $coursename . "</option>" . PHP_EOL;  

    if (isset($_POST['courses']) && ($_POST['courses'] == $course)) {
        $outputcourse = "<p><strong>Course:</strong> " . $courseno .  " - "  . $coursename . "</p>";
    }

} 

$courseHTML .= '</select>'; 

?>

<form id="myForm" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
    <table>
        <tr>
            <th>Course: <?php echo $courseHTML; ?></th>
        </tr>
    </table>
    <p>
        <input id="moduleSubmit" type="button" value="Submit Course and Module" name="moduleSubmit" onclick="validation();" />
    </p>
    <div id="moduleAlert"></div>
    <div id="targetdiv"></div>
</form>


<?php

if (isset($_POST['moduleSubmit'])) {    

    $sessionquery = "
    SELECT SessionId, SessionName, SessionDate, SessionTime, CourseId, SessionActive
    FROM Session
    WHERE (CourseId = ? AND SessionActive = ?)
    ORDER BY SessionName 
    ";

    $active = 1;

    $sessionqrystmt=$mysqli->prepare($sessionquery);
    // You only need to call bind_param once
    $sessionqrystmt->bind_param("si",$course, $active);
    // get result and assign variables (prefix with db)

    $sessionqrystmt->execute(); 

    $sessionqrystmt->bind_result($dbSessionId,$dbSessionName,$dbSessionDate,$dbSessionTime, $dbCourseId, $dbSessionActive);

    $sessionqrystmt->store_result();

    $sessionnum = $sessionqrystmt->num_rows();   

    if($sessionnum == 0) {
        echo "<p><span style='color: red'>Sorry, You have No Assessments under this Module</span></p>";
    } 
    else 
    { 
        echo "";
    }

    ...

}
?>
于 2012-11-25T23:31:18.370 回答