如何检测我的总价格是否大于我在文本框中输入的价格 [英] How Can I Detect Whether My Total Price Is Greater Than The Price I Inputted On Textbox

问题描述

我的购物车有问题，希望您能为我解决问题.
我有一个购物车，其中包含一个在数据库中选择值时得到的会话.
我还有一个文本框，其中包含所需的预算.

我的问题是我想显示一条错误消息，该消息可以检测会话的总价格是否大于预算.

这是我的代码，希望您能对我有所帮助
< form method ="get">



预算:
<输入type ="text" name ="budget" class ="txtfield"占位符=请输入所需的预算">


服务类型:

<选择name ="servicetype" class ="txtfield">
< option>婚礼</option>
< option>首次亮相</option>
< option>生日</option>
</select>




<输入类型=提交" name =搜索" value =搜索" class ="btn btn-warning">


</form>

所需金额:


请输入您想要的金额'';
}
其他
{
$ servicetype = $ _GET [''servicetype''];
$ results = $ mysqli-> query("SELECT service_inclusion，price，servicetype，soid FROM service_offer
其中servicetype =''$ servicetype''ORDER BY soid ASC);
如果($ results)
{

while($ obj = $ results-> fetch_object())
{

回声'''';
回声''< form method ="get" action ="cart_update.php">'';

回声''''.$ obj-> service_inclusion.'''';
echo``价格:''.$ currency.$ obj-> price.'''';
echo``服务类型:''.$ obj-> servicetype.'''';
回声'''';
echo''< button style ="background:#F01818; color:white; border:0;">添加服务</button>'';
回声'''';
echo''< input type ="hidden" name ="service_inclusion" value =''.$ obj-> service_inclusion.''"/>'';
回声''< input type ="hidden" name ="type" value ="add"/>'';
回声''< input type ="hidden" name ="soid" value =''.$ obj-> soid.''"/>'';
回声''< input type ="hidden" name ="return_url" value =''.$ current_url.''"/>'';
回声''</form>'';
回声'''';
}
}
}

?>

您的购物车
'';
if($ _ GET [''budget'']> $ cart_itm [''price''])
{
$ message =``错误'';
}
其他
{
foreach($ _SESSION ["products"] as $ cart_itm)
{

回声'''';
回声``×'';
回声''''.$ cart_itm ["name"].''.'';
echo''Price:''.$ currency.$ cart_itm ["price"].''.'';
回声'''';
$ subtotal =($ cart_itm ["price"]);
$ Total =($ total + $ subtotal);

} echo'''';
echo``Total:''.$ currency.$ Total.''退房！'';
回声``空购物车'';
}}
其他
{
回显``您的购物车为空'';

}}
?> ;;
< script type ="text/javascript">
</script>

Hi i have a problem with my shopiing cart i hope you can help me with my problem.
I have a shopping cart which contains a session that i get when selecting values on database.
I have also a textbox which contains a desired budget.

My problem is I want to have a error message which can detect if the total price of the session is greater than the budget.

here is my code I hope you can help me
<form method="get">



Budget:
<input type="text" name="budget" class="txtfield" placeholder="Please enter your desired budget">


Service Type:

<select name="servicetype" class="txtfield">
<option>Wedding</option>
<option>Debut</option>
<option>Birthday</option>
</select>




<input type="submit" name="search" value="Search" class="btn btn-warning">


</form>

Desired Amount:


Please enter your desired amount'';
}
else
{
$servicetype = $_GET[''servicetype''];
$results = $mysqli->query("SELECT service_inclusion,price,servicetype,soid FROM service_offer
where servicetype=''$servicetype'' ORDER BY soid ASC");
if ($results)
{

while($obj = $results->fetch_object())
{

echo '''';
echo ''<form method="get" action="cart_update.php">'';

echo ''''.$obj->service_inclusion.'''';
echo ''Price: ''.$currency.$obj->price.'' '';
echo ''Service Type: ''.$obj->servicetype.'' '';
echo '''';
echo ''<button style="background:#F01818; color:white;border:0;">Add Services</button>'';
echo '''';
echo ''<input type="hidden" name="service_inclusion" value="''.$obj->service_inclusion.''" />'';
echo ''<input type="hidden" name="type" value="add" />'';
echo ''<input type="hidden" name="soid" value="''.$obj->soid.''" />'';
echo ''<input type="hidden" name="return_url" value="''.$current_url.''" />'';
echo ''</form>'';
echo '''';
}
}
}

?>

Your Shopping Cart
'';
if($_GET[''budget''] > $cart_itm[''price''])
{
$message = ''error'';
}
else
{
foreach ($_SESSION["products"] as $cart_itm)
{

echo '''';
echo ''×'';
echo ''''.$cart_itm["name"].'''';
echo ''Price :''.$currency.$cart_itm["price"].'''';
echo '''';
$subtotal = ($cart_itm["price"]);
$Total = ($total + $subtotal);

}echo'''';
echo ''Total : ''.$currency.$Total.'' Check-out!'';
echo ''Empty Cart'';
} }
else
{
echo ''Your Cart is empty'';

}}
?>;
<script type="text/javascript">
</script>

推荐答案

servicetype =

servicetype =

_GET [''servicetype''];

_GET[''servicetype''];

结果=

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