[英]How to prevent buttons from submitting forms when value is not selected. Without using javascript
無論如何,如果未選擇該值而不使用javascript,是否可以阻止按鈕提交表單?
這是我的代碼。
<!-- form -->
<form name="aform" action="second_page.php" method="POST">
<div id="collegelane">
Please choose only one from the following rooms:
</div>
<?php
// connects to database
require("user_connection.php");
$q = mysqli_query($connect, "SELECT * FROM `campus`");
while ($line = mysqli_fetch_assoc($q)) {
echo '<input id="onclick" type="checkbox" name="car"
value="'.$line['room'].'"><label>'.$line['room'].'</label></br>';
}
?>
</br>
</br>
<div id="next">
<input type="submit" name="next" Value="next"/>
</div>
</form>
由於已經建議您在復選框上添加“ required”屬性,如下所示,它應該可以正常工作。 不確定瀏覽器是否支持該屬性,我懷疑它可能不適用於某些版本的IE。
<?php
// connects to database
require("user_connection.php");
$q = mysqli_query($connect, "SELECT * FROM `campus`");
while ($line = mysqli_fetch_assoc($q)) {
echo '<input id="onclick" required type="checkbox" name="car"
value="'.$line['room'].'"><label>'.$line['room'].'</label></br>';
}
?>
html5表單驗證: http : //www.the-art-of-web.com/html/html5-form-validation/
AngularJs表單驗證: https ://docs.angularjs.org/guide/forms
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