我如何在下拉选择菜单上添加验证我有代码,我正在工作,但问题是没有什么工作,没有显示错误消息。如果在点击add to cart按钮之前不应该选择下拉选择值,我想显示错误信息?
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 $row3['id'];?>);" />
</form
发布于 2013-04-06 17:00:15
请尝试一下它的工作
应该是这样的
<?php
if($_POST['country']=="0")
{
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="0">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>
发布于 2013-04-06 17:02:28
如果我没有回答您的问题,您是否希望在提交表单之前进行验证?如果是这样,那么您需要使用客户端验证:
发布于 2013-04-06 17:29:12
在此处对html进行更改
<option value="0">Select</option>
并像这样运行来检查
function check_selected_or_not(){
var check_selected = jQuery('#size').val();
if (check_selected == 0){
alert('Please select');
}else{
alert('sucess');
}
}
https://stackoverflow.com/questions/15848878
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