问题描述
我想实现这个功能,当product_stock == 0
时卡片元素会变成灰色。我尝试使用 javascript 实现此功能,但它不起作用。我不知道我的代码有什么问题。你们中的任何人都可以帮我解决这个问题吗?如果你们能向我展示如何解决这个问题的代码示例,我们将不胜感激。任何帮助将不胜感激。谢谢!
<?PHP
$sql = "SELECT * FROM (( SELECT * FROM products) as YW1
LEFT JOIN
(SELECT product_id,SUM(quantity) totalquantity FROM ordered_items GROUP BY product_id) AS YW2 ON YW1.id = YW2.product_id) ORDER BY totalquantity DESC ";
$query = $conn->query($sql);
if (!MysqLi_num_rows($query)) {
echo '
<div class="col-12">
<div class="badge badge-danger">No Products Found</div>
</div>
';
} else {
while ($row = $query->fetch_assoc()) {
$product_stock = $row['product_stock'];
?>
<div class="col-lg-3 col-md-4 col-6 form-group" style="padding: 0 8px 0 8px;" >
<div class="product-wrapper" id="productlist">
<img class="product-img" loading="lazy" src="images/product-main/<?PHP echo $row['product_photo']; ?>" alt="">
<div class="card-body" >
<h5 class="product-title" style="min-height: 39px; text-decoration: none; width:150px; display: -webkit-Box;-webkit-line-clamp: 2;-webkit-Box-orient: vertical; overflow: hidden; text-align: left !important;"><?PHP echo $row['product_title']; ?></h5>
<p class="product-price">RM<?PHP echo $row['product_price']; ?>/KG</p>
<p style="font-size: 10px; margin-top:-10px; margin-bottom:-2px;" ><span class="text-danger" > <?PHP echo $sum = $row['totalquantity'] ?? 0;?> SOLD </span></p>
<p style="font-size: 10px;" ><span class="text-success"><?PHP echo $row['product_stock']; ?> IN STOCK </span></p>
<a href="product.PHP?cid=<?PHP echo $row['id']; ?>" class="btn btn-block addtocart text-center" style="text-decoration: none">View More</a>
</div>
</div>
</div>
<?PHP
}
}
?>
这是当product_stock = 0
更新的 JAVASCRIPT 代码
<script>
getfocus();
function getfocus() {
document.getElementById("productlist").focus();
var product_stock = "<?PHP echo $product_stock; ?>";
if(product_stock == 0) {
$(product_stock).focus();
$(product_stock).css({'border' : '1px solid red'});
$(product_stock).css("background-color","#d0d0d0");
}
}
</script>
解决方法
这是因为在脚本中调用 product_stock 变量时未定义它。 无需使用 javascript 代码,只需将样式直接添加到 PHP 代码中即可。
while ($row = $query->fetch_assoc()) {
$product_stock = $row['product_stock'];
?>
<div class="col-lg-3 col-md-4 col-6 form-group" style="padding: 0 8px 0 8px;" >
<div class="product-wrapper" id="productlist" style='<?php echo $product_stock == 0 ? "background-color:#d0d0d0; border:1px solid red;" : ""; ?>'>
<img class="product-img" loading="lazy" src="images/product-main/<?php echo $row['product_photo']; ?>" alt="">
<div class="card-body" >
<h5 class="product-title" style="min-height: 39px; text-decoration: none; width:150px; display: -webkit-box;-webkit-line-clamp: 2;-webkit-box-orient: vertical; overflow: hidden; text-align: left !important;"><?php echo $row['product_title']; ?></h5>
<p class="product-price">RM<?php echo $row['product_price']; ?>/KG</p>
<p style="font-size: 10px; margin-top:-10px; margin-bottom:-2px;" ><span class="text-danger" > <?php echo $sum = $row['totalquantity'] ?? 0;?> SOLD </span></p>
<p style="font-size: 10px;" ><span class="text-success"><?php echo $row['product_stock']; ?> IN STOCK </span></p>
<a href="product.php?cid=<?php echo $row['id']; ?>" class="btn btn-block addtocart text-center" style="text-decoration: none">View More</a>
</div>
</div>
</div>
<?php
}