我如何添加验证下拉选择菜单我有代码,我正在努力,但问题是,不工作没有显示错误消息。如果在点击添加到购物车按钮之前不应选择下拉选择值,我想显示错误消息?如何在下拉选择菜单上添加验证?
if(isset($_REQUEST['check'])){
if (isset($_POST['size']) && $_POST['size'] == '') {
echo 'Error, select category';
exit;
}}
<form action="" id="size1" name="size1" method="post">
<select style="background-color:#CCC"
name="size" id="size" onchange="this.form.submit();" >
<option value="">Select</option>
<option <?php if ($_POST['size'] == 'Small')
print 'selected '; ?> value="Small">Small</option>
<option <?php if ($_POST['size'] == 'Medium')
print 'selected '; ?> value="Medium">Medium</option>
<option <?php if ($_POST['size'] == 'Large')
print 'selected '; ?> value="Large">Large</option>
<option <?php if ($_POST['size'] == 'XL')
print 'selected '; ?> value="XL">XL</option>
</select>
<input type="button" class="button1" name="check"
value="Add To Cart" onclick="addtocart(<?php echo $row3['id'];?>);" />
</form
你jQuery是不工作,请检查它 – 2013-04-06 09:52:42
@farhan从你的'addtocart'函数调用他的函数 – 2013-04-06 09:57:09