如果<i class="far fa-star"></i>
和rowCount == 0
将打印> 0
,则下面的代码将打印出<i class="fas fa-check"></i>
,在用户提交表格后,他们将无法除非他们刷新页面,否则请参见<i class="fas fa-check"></i>
;在用户提交表单后,页面会自行刷新,并且用户需要再刷新一次才能查看<i class="fas fa-check"></i>
:
if ($rowCountFav == 0) {
$favIcon = '<i class="far fa-star"></i>';
}else{$favIcon = '<i class="fas fa-check"></i>';}
if($_SERVER['REQUEST_METHOD'] == 'POST'){
if(isset($_POST["fav"])){
if ($rowCountFav == 0) {
$favorito = $conn->prepare("INSERT INTO `favorito` (user_id, nameItem) VALUES (:user_id, :nameItem)");
$favorito->bindParam(':user_id', $user_id, PDO::PARAM_INT);
$favorito->bindParam(':nameItem', $nameItem, PDO::PARAM_STR);
$favorito->execute();
}
}
}
?>
<form action="" method="post" autocomplete="off">
<button class="btnSub btnA" type="submit" name="fav" />
Favorito <?= $favIcon;?>
</button> <span class="ml-1 mr-2">-</span>
</form>
我想要的东西:我想在用户提交表单后打印出<i class="fas fa-check"></i>
。
所以我尝试了这个,但是没有改变:
if($_SERVER['REQUEST_METHOD'] == 'POST'){
if(isset($_POST["fav"])){
if ($rowCountFav == 0) {
$favorito = $conn->prepare("INSERT INTO `favorito` (user_id, nameItem) VALUES (:user_id, :nameItem)");
$favorito->bindParam(':user_id', $user_id, PDO::PARAM_INT);
$favorito->bindParam(':nameItem', $nameItem, PDO::PARAM_STR);
$favorito->execute();
}else{$favIcon = '<i class="fas fa-check"></i>';} ## I just added this line ##
}
}
有人可以帮忙吗?
答案 0 :(得分:1)
您先检查$rowCountFav
,然后再进行更新。解决的方法很简单,切换检查和查询。查询后,您还需要更新变量值:
if($_SERVER['REQUEST_METHOD'] == 'POST'){
if(isset($_POST["fav"])){
if ($rowCountFav == 0) {
$favorito = $conn->prepare("INSERT INTO `favorito` (user_id, nameItem) VALUES (:user_id, :nameItem)");
$favorito->bindParam(':user_id', $user_id, PDO::PARAM_INT);
$favorito->bindParam(':nameItem', $nameItem, PDO::PARAM_STR);
$favorito->execute();
$rowCountFav = 1;
}
}
}
if ($rowCountFav == 0) {
$favIcon = '<i class="far fa-star"></i>';
} else {
$favIcon = '<i class="fas fa-check"></i>';
}
?>
<form action="" method="post" autocomplete="off">
<button class="btnSub btnA" type="submit" name="fav" />
Favorito <?= $favIcon;?>
</button> <span class="ml-1 mr-2">-</span>
</form>