php - 无法在提交时出现确认框

Question

我正在尝试使用onsubmit="return confirm('Do you really want to submit the form?')"在用户通过单击提交按钮删除项目之前出现警告。我无法让确认框出现，它只是继续直接删除该项目。

谁能在我的代码中看到我可能出错的地方？我尝试更改双引号和单引号，但没有任何努力让确认框出现。

我的代码如下。

    echo '<td> <form method="post" action="deleteassign.php" name="deleteassignform"
 id="deleteassignform" onsubmit="return confirm('Do you really want to submit the form?')">';
    echo '<input type="hidden" name="quizidvalue" id="quizidvalue" value="'.$sendquizid.'" />';
    echo '<input type="hidden" name="classidvalue" id="classidvalue" value="'.$sendclassid.'" />';
    echo '<input type="submit" name="deleteassignment" id="deleteassignment" value="Delete This Assignment"> </form> </td> </tr>';

Answer 1

改变你的：

return confirm('Do you really want to submit the form?')

到

return confirm(\'Do you really want to submit the form?\')

这应该可以解决这给您带来的任何引用问题，因为它肯定被错误地引用了。

Answer 2

为了输出...

onsubmit="return confirm('Do you really want to submit the form?')"

...你需要在 PHP 端正确地转义你的引号。尝试以下操作（注意单引号前的反斜杠）：

echo '<td> <form method="post" action="deleteassign.php" name="deleteassignform"
 id="deleteassignform" onsubmit="return confirm(\'Do you really want to submit the form?\')">';

Answer 3

为什么不直接把代码放在按钮里呢？

<input type="submit" name="deleteassignment" id="deleteassignment" 
value="Delete This Assignment" onclick="return confirm('Do you really want to delete?')">

Answer 4

你的引用是错误的。您可以更好地使用此表单，因此所有引号都是正确的：

?><td> <form method="post" action="deleteassign.php" name="deleteassignform"
id="deleteassignform" onsubmit="return confirm('Do you really want to submit the form?')">
<input type="hidden" name="quizidvalue" id="quizidvalue" value="<?= htmlspecialchars($sendquizid) ?>" />
<input type="hidden" name="classidvalue" id="classidvalue" value="<?= htmlspecialchars($sendclassid) ?>" />
<input type="submit" name="deleteassignment" id="deleteassignment" value="Delete This Assignment"> </form> </td> </tr>
<?php

Answer 5

您的代码输出的代码应如下所示：

<form method="post" action="deleteassign.php" name="deleteassignform"
 id="deleteassignform" onSubmit="return confirm('Do you really want to submit the form?');">

注意函数内部的引用confirm。