下拉数据未发送到 $_POST php
[英]Dropdown data not being sent to $_POST php
问题描述
I'm new to coding, and have encountered some difficulty with the drop-down list.
我是编码新手，在使用下拉列表时遇到了一些困难。 Would appreciate any help given!将不胜感激任何帮助！
I have this:我有这个：
<html>
<select name="Subject">
<option value="One">One</option>
<option value="Two">Two</option>
</select>
</html>
<?php
if (isset($_POST['submit'])) {
echo $_POST['Subject'];
}
echo '
<form method="post"><input type="submit" name="submit" value="Submit Option!"></form>';
?>
This returns me with an unidentified index error for 'Subject' whenever I hit the Submit Option button.每当我点击提交选项按钮时，这都会为我返回一个未识别的“主题”索引错误。 I did a print_r($_POST) and realized that my selected options for the drop-down list "Subject" did not pass through.我做了一个print_r($_POST)并意识到我为下拉列表“主题”选择的选项没有通过。 (ie The $_POST array that was printed did not show anything selected options from the drop-down list) （即打印的$_POST数组没有显示任何从下拉列表中选择的选项）
2 个解决方案
解决方案1
3 2016-09-20 14:14:58
One of the first things to know about HTML forms is that, when a form is submitted, the information contained within it gets submitted.其中的第一件事情了解HTML表单的是，当一个表单提交，包含在它被提交的信息。 To submit a value for Subject, that field needs to be contained within the <form> element.要提交主题的值，该字段需要包含在<form>元素中。
<html>
<?php
if (isset($_POST['submit'])) {
echo $_POST['Subject'];
}
?>
<form method="post">
<select name="Subject">
<option value="One">One</option>
<option value="Two">Two</option>
</select>
<input type="submit" name="submit" value="Submit Option!">
</form>
</html>
解决方案2
2 已采纳 2016-09-20 14:12:38
Put <form> code above the <select> like below:-将<form>代码放在<select>上方，如下所示：-
<html>
<form method="post">
<select name="Subject">
<option value="One">One</option>
<option value="Two">Two</option>
</select>
<input type="submit" name="submit" value="Submit Option!"></form>
</html>
<?php
if (isset($_POST['submit'])){
echo $_POST['Subject'];
}
?>
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