bmi-app/index.html at main · cs280fa21/bmi-app · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>BMI Calculator</title>
    <link
      href="https://unpkg.com/@primer/css@^16.0.0/dist/primer.css"
      rel="stylesheet"
    />
    <style>
      .input-block {
        width: 100% !important;
        margin-right: 0 !important;
      }
    </style>
  </head>
  <body>
    <!-- Header -->
    <div class="Header py-5 mb-5">
      <div class="mx-auto h1 text-center">Body Mass Index Calculator</div>
    </div>

    <!-- FORM -->
    <div class="container-lg clearfix">
      <div class="col-3 float-right p-4"></div>
      <div class="col-6 float-right border p-4">
        <div>Tell Us About Yourself</div>
        <form id="form">
          <div class="form-group">
            <div class="form-group-header">
              <label for="age">Age</label>
            </div>
            <div class="form-group-body">
              <input
                class="form-control input-block"
                type="number"
                id="age"
                name="age"
              />
            </div>
          </div>
          <div class="form-group">
            <div class="form-group-header">
              <label>Gender</label>
            </div>
            <div class="form-group-body">
              <select class="form-select input-block" value="" id="gender">
                <option value=""></option>
                <option value="male">Male</option>
                <option>Female</option>
              </select>
            </div>
          </div>
          <div class="form-group">
            <div class="form-group-header">
              <label for="height">Height (cm)</label>
            </div>
            <div class="form-group-body">
              <input
                class="form-control input-block"
                type="number"
                id="height"
                name="height"
              />
            </div>
          </div>
          <div class="form-group">
            <div class="form-group-header">
              <label for="weight">Weight (kg)</label>
            </div>
            <div class="form-group-body">
              <input
                class="form-control input-block"
                type="number"
                id="weight"
                name="weight"
              />
            </div>
          </div>
          <div class="mt-5 form-actions">
            <button
              class="btn"
              type="submit"
              class="btn btn-primary"
              id="submit"
            >
              Submit
            </button>
          </div>
        </form>
      </div>
      <div class="col-3 float-right p-4"></div>
    </div>

    <!-- Result -->
    <div class="container-lg clearfix">
      <div class="col-3 float-right p-4"></div>
      <div class="mt-5 col-6 float-right text-center">
        <div id="output">
          <div id="result" class="f3-light"></div>
          <div id="bmi" class="f1-light"></div>
        </div>
      </div>
      <div class="col-3 float-right p-4"></div>
    </div>

    <script>
      document.getElementById("submit").addEventListener("click", validateForm);

      const age = document.getElementById("age");
      const height = document.getElementById("height");
      const weight = document.getElementById("weight");
      const gender = document.getElementById("gender");

      const output = document.getElementById("output");
      const result = document.getElementById("result");
      const bmi = document.getElementById("bmi");

      function validateForm(event) {
        clear();
        event.preventDefault();
        if (
          age.value == "" ||
          height.value == "" ||
          weight.value == "" ||
          gender.value == ""
        ) {
          output.className = "flash flash-error";
          result.innerText = "All fields are required!";
        } else {
          calcBmi();
        }
      }

      function clear() {
        result.innerHTML = "";
        bmi.innerHTML = "";
        output.className = "";
      }

      function calcBmi() {
        const p = [age.value, height.value, weight.value, gender.value];
        const bmiVal =
          Number(p[2]) / (((Number(p[1]) / 100) * Number(p[1])) / 100);

        if (bmiVal < 18.5) {
          output.className = "flash";
          result.innerText = "Underweight";
        } else if (bmiVal <= 24.9) {
          output.className = "flash flash-success";
          result.innerText = "Healthy";
        } else if (bmiVal <= 29.9) {
          output.className = "flash flash-warn";
          result.innerText = "Overweight";
        } else if (bmiVal <= 34.9) {
          output.className = "flash flash-error";
          result.innerText = "Obese";
        } else {
          output.className = "flash flash-error";
          result.innerText = "Extremely obese";
        }

        bmi.innerText = "BMI: " + parseFloat(bmiVal).toFixed(2);
      }
    </script>
  </body>
</html>