如何使用JavaScript创建电子商务产品价格计量计算器？

编程问答 2022-08-16

问题描述

我从一个答案中找到了这种代码格式，这是有益的。但是我需要在这里进行一些修改。我是javascript的新手，我想在这里添加一些数量范围。数量增加时，我想要不同的价格。在这里，您可以看到不同的“尺寸”和不同的“侧面和颜色”。例如：如果一个数量的常规价格为38.4美元，那么当数量为10到24时，我希望总成本应将价格计算为9.71美元/数量。怎么做呢？谢谢

<!DOCTYPE html>
<html lang="en">
<head>
    <Meta charset="UTF-8">
    <Meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>Document</title>
</head>
<body>
  <h2>Build Your Bodycare</h2>
  <form action="insertlabel.PHP" id="privtelabel" method="POST">
        Size:
        <select name='product' id='product' required>
          <option value="18X24">18"X24"</option>
          <option value="12X18">12"X18"</option>
          <option value="12X24">12"X24"</option>
          <option value="16X24">16"X24"</option>
          <option value="24X24">24"X24"</option>
          <option value="24X32">24"X32"</option>
          <option value="24X36">24"X36"</option>
          <option value="24X48">24"X48"</option>
        </select>
    
        <br><br> Quantity: <input type="text" name="quantity" id='quantity' required> 
        <br><br>Side & Color:
        <select name='size' id='size' required>
          <option value="1-Side 1-Color">1-Side 1-Color</option>
          <option value="1-Side 2-Color">1-Side 2-Color</option>
          <option value="2-Side 1-Color">2-Side 1-Color</option>
          <option value="2-Side 2-Color">2-Side 2-Color</option>
          <option value="1-Side Full-Color">1-Side Full-Color</option>
          <option value="1-Side Full-Color">1-Side Full-Color</option>
        </select>
        
        <p>(Sizes are only for soaps.)</p>
        Price: <span id="totalCost"></span>

    </form>

    <script>
        //Store some references to our DOM elements
        var productEl = document.querySelector('#product');
        var quantityEl = document.querySelector('#quantity');
        var sizeEl = document.querySelector('#size');
        var totalCostEl = document.querySelector('#totalCost');

        //Add the change event handlers on the applicable elements
        productEl.addEventListener('change',calculatetotal);
        quantityEl.addEventListener('change',calculatetotal);
        sizeEl.addEventListener('change',calculatetotal);

        //Store your data in an object literal (essentially creating a map)
        var product_price = {}; //Noticed I replaced the [] with {}
        product_price['18X24'] = 5;
        product_price['12X18'] = 6;
        product_price['12X24'] = 6;
        product_price['16X24'] = 7;
        product_price['24X24'] = 8;
        product_price['24X32'] = 8;
        product_price['24X36'] = 10;
        product_price['24X48'] = 15;

        var size_price = {};   //Noticed I replaced the [] with {}
        size_price['1-Side 1-Color'] = 0;
        size_price['1-Side 2-Color'] = 2;
        size_price['2-Side 1-Color'] = 3;
        size_price['2-Side 2-Color'] = 5;
        size_price['1-Side Full-Color'] = 5;
        size_price['2-Side Full-Color'] = 5;


        //Here's our single event handler - called when any of the 3 elements fire a 'change' event
        function calculatetotal() {
        //console.log()
        var unitCost = product_price[productEl.value];
        var additionalCost = size_price[sizeEl.value] || 0;
        var qty = quantityEl.value || 0;

        totalCostEl.textContent = `Total cost: $${(unitCost * qty) + additionalCost}`;
        }
    </script>
   
</body>
</html>

解决方法

我已经改变了我的解决方案。我将其变成{0-10: 6,10-24: 7}而不是{9 : 6,24 : 7 }。所以我可以检查数量。我添加了一条if else语句，但是对于所有不同的范围，它很容易变成switch语句。我刚刚添加了前两个范围。

//Store some references to our DOM elements
var productEl = document.querySelector('#product');
var quantityEl = document.querySelector('#quantity');
var sizeEl = document.querySelector('#size');
var totalCostEl = document.querySelector('#totalCost');

//Add the change event handlers on the applicable elements
productEl.addEventListener('change',calculateTotal);
quantityEl.addEventListener('change',calculateTotal);
sizeEl.addEventListener('change',calculateTotal);

//Store your data in an object literal (essentially creating a map)
var product_price = {}; //Noticed I replaced the [] with {}
product_price['18X24'] = {
  9: 5,24: 6
};
product_price['12X18'] = {
  9: 6,24: 8.24
};
product_price['12X24'] = {
  9: 6,24: 7.45
};
product_price['16X24'] = {
  9: 7,24: 8.14
};
product_price['24X24'] = {
  9: 8,24: 9.24
};
product_price['24X32'] = {
  9: 8,24: 10.99
};
product_price['24X36'] = {
  9: 10,24: 11.99
};
product_price['24X48'] = {
  9: 15,24: 17.00
};

var size_price = {}; //Noticed I replaced the [] with {}
size_price['1-Side 1-Color'] = 0;
size_price['1-Side 2-Color'] = 2;
size_price['2-Side 1-Color'] = 3;
size_price['2-Side 2-Color'] = 5;
size_price['1-Side Full-Color'] = 5;
size_price['2-Side Full-Color'] = 5;


//Here's our single event handler - called when any of the 3 elements fire a 'change' event
function calculateTotal() {
  //console.log()


  var additionalCost = size_price[sizeEl.value] || 0;
  var qty = quantityEl.value || 0;

  var price;

  if (qty < 10) {
    price = product_price[productEl.value][9]
  } else if (qty >= 10) {
    price = product_price[productEl.value][24]
  }

  totalCostEl.textContent = `Total cost: $${(price * qty) + additionalCost}`;
}
<h2>Build Your Bodycare</h2>
<form action="insertlabel.php" id="privtelabel" method="POST">
  Size:
  <select name='product' id='product' required>
    <option value="18X24">18"X24"</option>
    <option value="12X18">12"X18"</option>
    <option value="12X24">12"X24"</option>
    <option value="16X24">16"X24"</option>
    <option value="24X24">24"X24"</option>
    <option value="24X32">24"X32"</option>
    <option value="24X36">24"X36"</option>
    <option value="24X48">24"X48"</option>
  </select>

  <br><br> Quantity: <input type="text" name="quantity" id='quantity' required>
  <br><br>Side & Color:
  <select name='size' id='size' required>
    <option value="1-Side 1-Color">1-Side 1-Color</option>
    <option value="1-Side 2-Color">1-Side 2-Color</option>
    <option value="2-Side 1-Color">2-Side 1-Color</option>
    <option value="2-Side 2-Color">2-Side 2-Color</option>
    <option value="1-Side Full-Color">1-Side Full-Color</option>
    <option value="1-Side Full-Color">1-Side Full-Color</option>
  </select>

  <p>(Sizes are only for soaps.)</p>
  Price: <span id="totalCost"></span>

</form>

arraysarrayse-commercejavascriptprice