使用按钮f增加和减少数量 [英] Increasing and decreasing the quantity using buttons f

问题描述

我需要在按钮上添加功能.我试图将其添加到php文件中.

I need to add functions to the buttons.I tried to add that to the php file.

脚本在这里:

$(document).ready(function(){
        $document.on('click','#minus_button',function(){
            selected=$(this.attr("data-id"));

            quantity = parseInt($('#quantity[data-id="'+selected'"]').val());

            $('#quantity[data-id="'+selected'"]').val(quantity -1);


        });

        $document.on('click','#plus_button',function(){
            selected=$(this.attr("data-id"));

            quantity = parseInt($('#quantity[data-id="'+selected'"]').val());

            $('#quantity[data-id="'+selected'"]').val(quantity + 1);

        });
    });

以下是按钮:

<button type=\"button\" class=\"btn bg-light border rounded-circle\" id=\"minus_button\" data-id=\"$productid\"><i class=\"fas fa-minus\"></i></button>
<input type=\"text\" value=\"1\" class=\"form-control w-25 d-inline\" id=\"quantity\" data-id=\"$productid\">
<button type=\"button\" class=\" btn bg-light border rounded-circle\"id=\"plus_button\" data-id=\"$productid\"><i class=\"fas fa-plus\"></i></button>

我从数据库中获得了product_id.按钮不起作用.如果您有帮助，我将很高兴.

I get the product_id from database.Buttons do not work.I would be glad if you help.

推荐答案

还有该脚本来计算总价.但是以这种方式，我需要在上面添加数量.当我尝试添加时，它不起作用.

And also that script to calculate total price.But in this manner,I need add quantity on it.When I tried to add that it doesn't work.

<?php

                $total = 0;
                    if (isset($_SESSION['cart'])){
                        $product_id = array_column($_SESSION['cart'], 'product_id');

                        $result = $db->getData();
                        while ($row = mysqli_fetch_assoc($result)){
                            foreach ($product_id as $id){
                                if ($row['id'] == $id){
                                    cartElement($row['product_image'], $row['product_name'],$row['product_price'], $row['id']);
                                    $total = $total + (int)$row['product_price'];
                                }
                            }
                        }
                    }else{
                        echo "<h5>Cart is Empty</h5>";
                    }

                ?>

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