Dog RER and MER Calculator ?

This article will take an in-depth look at the code for the Dog Resting Energy Requirements (RER) and Maintenance Energy Requirements (MER) Calculator, explaining each part of the code, its purpose, and how to improve it. If you want to test the code, click here ???.

This web-based tool allows pet owners to calculate their dog’s calorie needs based on their weight, life stage and activity level. The calculation involves two main formulas: one for resting energy requirements (RER) and another for maintenance energy requirements (MER).

HTML structure ??

Infrastructure:

<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="計(jì)算您狗狗的靜息能量需求 (RER) 和維持能量需求 (MER)...">
<meta name="keywords" content="狗狗 RER 計(jì)算器，狗狗 MER 計(jì)算器，狗狗營養(yǎng)，寵物卡路里計(jì)算器，靜息能量需求，維持能量需求">
<meta name="author" content="您的網(wǎng)站名稱">
<title>狗狗 RER 和 MER 計(jì)算器</title>

• The code starts with a standard HTML5 structure. The <meta> tag is crucial for SEO and describes the content of the page.
The
• <title> tag helps search engines and browsers understand the topic of the page.

Form elements:

<label for="weight">
    狗狗體重 (公斤): <input type="number" id="weight" required>
</label>

• The user enters their weight in a field of type Number, making sure only numerical values ??are accepted.
• The `required` attribute ensures that the input must be filled in before submission.

CSS layout and responsive styles?

We use CSS to style the calculator and make sure it looks great on all screen sizes. Here’s a breakdown of the CSS applied:

body.rer-body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f9f9f9;
    box-sizing: border-box;
}

• The body has a light background color, padding for spacing, and a consistent font for easy reading.

• The title is styled to be centered, in turquoise, and with appropriate spacing.

JavaScript calculation function?

The core functionality is here. This script takes input, performs calculations, and dynamically displays the results.

function calculateRER() {
    const weight = parseFloat(document.getElementById('weight').value);
    const age = document.getElementById('age').value;
    const activity = document.getElementById('activity').value;

    if (isNaN(weight) || weight <= 0) {
        alert('請輸入有效的體重!');
        return;
    }

    let rer = 70 * Math.pow(weight, 0.75);
    let mer = rer;

    // 根據(jù)生命階段和活動(dòng)水平調(diào)整 MER
    if (age === 'puppy') {
        mer *= 2; // 幼犬乘以2
    } else if (age === 'senior') {
        mer *= 1.2; // 老年犬乘以1.2
    }

    if (activity === 'high') {
        mer *= 1.6; // 高活動(dòng)量乘以1.6
    } else if (activity === 'moderate') {
        mer *= 1.4; // 中等活動(dòng)量乘以1.4
    }

    const resultDiv = document.getElementById('rer-result');
    resultDiv.innerHTML = `
        <p><strong>狗狗體重:</strong> ${weight} kg</p>
        <p><strong>生命階段:</strong> ${age}</p>
        <p><strong>活動(dòng)水平:</strong> ${activity}</p>
        <p><strong>靜息能量需求 (RER):</strong> ${rer.toFixed(2)} kcal/天</p>
        <p><strong>維持能量需求 (MER):</strong> ${mer} kcal/天</p>
    `;
    resultDiv.style.display = 'block';
}

Code explanation:

• We start by extracting the input values ??(weight, life stage and activity level) from the HTML form.
• We check if the weight is valid (`isNaN(weight)` makes sure it is a number and `weight > 0`).
• Resting Energy Requirement (RER) Calculated using the formula: 70 * weight^0.75.
• We use multipliers to adjust Maintenance Energy Requirements (MER) based on life stage (puppy, adult, or senior dog) and activity level (low, medium, high).
• Finally, we dynamically display the results in the `rer-result` div.

Code testing?

You can click here to test the code online. This is a great way to see your calculations in action and check that everything is working as expected.

How to improve this code?

Feel free to improve the code! Here are some areas where you can enhance its functionality:

• Improved input validation : Ensure all fields are thoroughly validated and provide user-friendly error messages.
• Unit Conversion: Allows users to switch weight and activity levels between metric and imperial units.
• Responsive design enhancements: Ensure the design adapts better to smaller screens (e.g., mobile devices).
• Feature Added: Add additional fields such as breed or age in months for more precise calculations.

Let me know your suggestions for improvements in the comments below! ?

By following these detailed steps, you can understand the code, tweak it, and even help improve it. Happy coding! ?

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