变量未转入PHP页面的URL？

我创建了一个简单的表单，当点击submit时，它将转到我创建的名为eventcreator.PHP的PHP页面；我试图将$u变量（本例中的用户名）带入eventcreator.php页面，这意味着如果我在该页面上回显它，它将输出$u变量

<div id="pageMiddle">

<form name="eventcreator" action="eventcreator.php?u=<?php echo $u ?>" method="post">

<div>Event Name: </div>
<input type="text" name="eventname" id="eventname" size="50" maxlength="75" />

<div>Month:</div>
<select name="eventdatemonth" id="eventdatemonth" >
<option value="January">January</option>
<option value="February">February</option>
<option value="March">March</option>
<option value="April">April</option>
<option value="May">May</option>
<option value="June">June</option>
<option value="July">July</option>
<option value="August">August</option>
<option value="September">September</option>
<option value="October">October</option>
<option value="November">November</option>
<option value="December">December</option>
</select>

<input type="submit" name="submit" class="button3" value="Create My Event!" onsubmit="checkForm();" />

错误1:

<div id="pageMiddle">

<form name="eventcreator" action="eventcreator.php" method="post">

<input type="hidden" name="u" value="<?php echo $u; ?>"/>

<div>Event Name: </div>
<input type="text" name="eventname" id="eventname" size="50" maxlength="75" />

<div>Month:</div>
<select name="eventdatemonth" id="eventdatemonth" >
<option value="January">January</option>
<option value="February">February</option>
<option value="March">March</option>
<option value="April">April</option>
<option value="May">May</option>
<option value="June">June</option>
<option value="July">July</option>
<option value="August">August</option>
<option value="September">September</option>
<option value="October">October</option>
<option value="November">November</option>
<option value="December">December</option>
</select>

<input type="submit" name="submit" class="button3" value="Create My Event!" onsubmit="checkForm();" />

$username = $_POST['u'];

echo $username;

在您的表单中，您提到的方法是
POST
，但您试图构建的url似乎是
GET
方法

错误2:

onsubmit attribute is for forms not for input elements

<form onsubmit="myFunction()">
</form>

onsubmit属性用于表单而不是输入元素

并向我们展示您的java脚本以进行更多分析
试试这个：

<div id="pageMiddle">

<form name="eventcreator" action="eventcreator.php" method="post">

<input type="hidden" name="u" value="<?php echo $u; ?>"/>

<div>Event Name: </div>
<input type="text" name="eventname" id="eventname" size="50" maxlength="75" />

<div>Month:</div>
<select name="eventdatemonth" id="eventdatemonth" >
<option value="January">January</option>
<option value="February">February</option>
<option value="March">March</option>
<option value="April">April</option>
<option value="May">May</option>
<option value="June">June</option>
<option value="July">July</option>
<option value="August">August</option>
<option value="September">September</option>
<option value="October">October</option>
<option value="November">November</option>
<option value="December">December</option>
</select>

<input type="submit" name="submit" class="button3" value="Create My Event!" onsubmit="checkForm();" />

$username = $_POST['u'];

echo $username;

checkForm（）的JavaScript函数可能有错误，导致无法执行正确的操作。请发布javascript@Leggendario理解。。。。谢谢你的建议。使用上面建议的隐藏场线为我完成了任务。谢谢。这项技术完成了我想要的。干杯。@aoigengo:确保对输出进行编码以防止XSS安全漏洞。此示例代码不阻止此操作。