为什么我的Javascript函数在HTML中调用时不能运行/工作？

所以我尝试了很多方法来调用函数本身。我对PHP/Javascript相当陌生，所以我正在努力边学边用

我做了一个函数来检查某个复选框是否被选中。我想让函数做的是，如果选中复选框，则将页面重定向到另一个页面，如果未选中，则显示一个警告框

我通过javascript函数传递的变量来自我的PHP代码，所以我想我的问题可能与这两种语言如何相互作用有关

这是我的密码。我从SQL数据库中获取各种变量，并将其存储在PHP变量中。我在PHP代码中的注释行之后调用该函数：

功能检查已接收（已接收，邮件）{
如果（已接收==已检查）{
window.location.assign（'https://someurl.php?email="邮件",；
}否则{
警惕（“LOL，不怎么样”）；
}
}

---

在javascript中，不要编写

if (received == checked){

但是

您想将收到的变量

与字符串
“checked”
进行比较。
通过PHP，
received
变量接收值
“checked”
或
“unchecked”

然后通过javascript函数调用将其转换为HTML。必须使用如下字符串调用javascript函数

checkReceived（“string”、“string”）

所以在PHP中它变成了

echo“checkReceived（\'string\，\'string\”）

和PHP变量

echo“checkReceived（\“$var1\”，\“$var2\”）

在您的代码中，它变成：

$strHTML .= "<td><button id='emailButton' onclick='checkReceived(\"$received\", \"$email\")'>$email</button></td>";

问题是当从php连接html时。调用函数时应使用转义序列（例如，单击checkbox（'Received'，“$ticketNumber”）\“
）

$strHTML=“$dateSubmitted”；
$strHTML.=“$department”；
$strHTML.=“$courseNo”；
$strHTML.=“$instructorName”；
$strHTML.=”；
$strHTML.=”；
//$strHTML.=”；
$strHTML.=“.$email.”；
$strHTML.=“打印”；
$strHTML.=”；

在javascript函数中，如果（checked==“checked”）
加上引号，我将从注释中扩展我的答案，并给出更好的解释

首先，在JS中，不要将变量与选中的
进行比较，而要与@PaulH提到的
“选中的”
（即字符串）进行比较

因此，您的JS应该如下所示：

function checkReceived(received, profEmail){
    if (received == "checked"){
        window.location.assign('https://someurl.php?email=' + profEmail);
    } else{
        alert("LOL HOW ABOUT NO");
    }
}

现在，对于PHP，在
行中，$strHTML.=''.$email.''
您没有将
$received
和
$email
变量的输出包装在引号（
“
）中。这是必要的，因为它会打印HTML，将字符串传递给JS函数。因此您的PHP代码需要如下所示：

<?php
    //This loop populates the ticket display using the records in the database
    while($recordSet->EOF == false){
        $ticketNumber = $recordSet->Fields['TicketNumber'];
        $dateSubmitted = $recordSet->Fields['DateSubmitted'];
        $department = $recordSet->Fields['Department'];
        $courseNo = $recordSet->Fields['CourseNumber'];
        $instructorName = $recordSet->Fields['InstructorName'];
        $received = ($recordSet->Fields['Received']) ? "checked" : "unchecked";
        $sendReminder = ($recordSet->Fields['SendReminder']) ? "checked" : "unchecked";
        $email = $recordSet->Fields['Email'];
        $CC = $recordSet->Fields['CC'];


        $strHTML  = "<tr><td>$dateSubmitted</td>";
        $strHTML .= "<td>$department</td>";
        $strHTML .= "<td>$courseNo</td>";
        $strHTML .= "<td style='word-break: break-all'>$instructorName</td>";
        $strHTML .= "<td align='center'> <input type='checkbox' ".$received." class='receivedCheckbox' onchange='checkboxClicked(\"Received\", ".$ticketNumber.")'/> </td>";
        $strHTML .= "<td align='center'> <input type='checkbox' ".$sendReminder." class='sendReminderCheckbox' onchange='checkboxClicked(\"SendReminder\", ".$ticketNumber.")' data-email='".$email."'/> </td>";
        //$strHTML .= "<td style='word-break: break-all;' align='center'> <a href='javascript:checkReceived($received, $email)'>".$email."</a></td>";
        $strHTML .= "<td><button id='emailButton' onclick='checkReceived(\"$received\", \"$email\")'>".$email."</button></td>";
        $strHTML .= "<td align='center'> <button onclick=\"window.open('https://someurl.php?ticketNumber=".$ticketNumber."')\">Print</button> </td>";
        $strHTML .= "</tr>";

        echo $strHTML;

        $recordSet->MoveNext;
    }
?>

if（received==checked）{
what's“checked”？它是一个字符串，我在这里发布时忘了做那个更改，但我已经将它更改为（received==checked）.Hey，实际上我已经做了此更改，但不幸的是，它仍然不起作用。您是否查看了浏览器的调试器JavaScript控制台以查找错误？是的，我查看了，我在调用函数时不断收到一个“语法错误：无效或意外标记”。是否可能发生类型不匹配？我已在问题console.log（）中添加了$strHTML当我执行该函数时，不会显示任何内容。它只是再次向我传递错误。您可能需要执行此操作
$strHTML.=''.$email.；
，以便您的HTML像
email@email.ca
checkReceived(received, profEmail){
    console.log(received, profEmail);
}

$strHTML  = "<tr><td>$dateSubmitted</td>";
    $strHTML .= "<td>$department</td>";
    $strHTML .= "<td>$courseNo</td>";
    $strHTML .= "<td style='word-break: break-all'>$instructorName</td>";
    $strHTML .= "<td align='center'> <input type='checkbox' ".$received." class='receivedCheckbox' onchange=\"checkboxClicked('Received', ".$ticketNumber.")\"/> </td>";
    $strHTML .= "<td align='center'> <input type='checkbox' ".$sendReminder." class='sendReminderCheckbox' onchange=\"checkboxClicked('SendReminder', ".$ticketNumber.")\" data-email='".$email."'/> </td>";
    //$strHTML .= "<td style='word-break: break-all;' align='center'> <a href='javascript:checkReceived($received, $email)'>".$email."</a></td>";
    $strHTML .= "<td><button id='emailButton' onclick=\"checkReceived('$received', '$email')\">".$email."</button></td>";
    $strHTML .= "<td align='center'> <button onclick=\"window.open('https://someurl.php?ticketNumber=".$ticketNumber."')\">Print</button> </td>";
    $strHTML .= "</tr>";

function checkReceived(received, profEmail){
    if (received == "checked"){
        window.location.assign('https://someurl.php?email=' + profEmail);
    } else{
        alert("LOL HOW ABOUT NO");
    }
}

<?php
    //This loop populates the ticket display using the records in the database
    while($recordSet->EOF == false){
        $ticketNumber = $recordSet->Fields['TicketNumber'];
        $dateSubmitted = $recordSet->Fields['DateSubmitted'];
        $department = $recordSet->Fields['Department'];
        $courseNo = $recordSet->Fields['CourseNumber'];
        $instructorName = $recordSet->Fields['InstructorName'];
        $received = ($recordSet->Fields['Received']) ? "checked" : "unchecked";
        $sendReminder = ($recordSet->Fields['SendReminder']) ? "checked" : "unchecked";
        $email = $recordSet->Fields['Email'];
        $CC = $recordSet->Fields['CC'];


        $strHTML  = "<tr><td>$dateSubmitted</td>";
        $strHTML .= "<td>$department</td>";
        $strHTML .= "<td>$courseNo</td>";
        $strHTML .= "<td style='word-break: break-all'>$instructorName</td>";
        $strHTML .= "<td align='center'> <input type='checkbox' ".$received." class='receivedCheckbox' onchange='checkboxClicked(\"Received\", ".$ticketNumber.")'/> </td>";
        $strHTML .= "<td align='center'> <input type='checkbox' ".$sendReminder." class='sendReminderCheckbox' onchange='checkboxClicked(\"SendReminder\", ".$ticketNumber.")' data-email='".$email."'/> </td>";
        //$strHTML .= "<td style='word-break: break-all;' align='center'> <a href='javascript:checkReceived($received, $email)'>".$email."</a></td>";
        $strHTML .= "<td><button id='emailButton' onclick='checkReceived(\"$received\", \"$email\")'>".$email."</button></td>";
        $strHTML .= "<td align='center'> <button onclick=\"window.open('https://someurl.php?ticketNumber=".$ticketNumber."')\">Print</button> </td>";
        $strHTML .= "</tr>";

        echo $strHTML;

        $recordSet->MoveNext;
    }
?>