learning-jsdp/ch07/object_properties.html at main · addyosmani/learning-jsdp · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Interactive Object Properties Example</title>
</head>
<body>
  <h1>Interactive Object Properties Example</h1>
  <form id="property-form">
    <label for="property-key">Enter a property key:</label>
    <input type="text" id="property-key" name="property-key" required>
    <label for="property-value">Enter a property value:</label>
    <input type="text" id="property-value" name="property-value" required>
    <button type="submit">Set Property</button>
  </form>
  <div id="output"></div>

  <script>
    var newObject = {};

    const form = document.getElementById('property-form');
    const output = document.getElementById('output');

    form.addEventListener('submit', (e) => {
      e.preventDefault();
      const propertyKey = document.getElementById('property-key').value;
      const propertyValue = document.getElementById('property-value').value;

      // 1. Dot syntax
      newObject[propertyKey] = propertyValue;
      console.log("Dot syntax:", newObject);

      // 2. Square bracket syntax
      newObject[propertyKey] = propertyValue;
      console.log("Square bracket syntax:", newObject);

      // 3. Object.defineProperty
      Object.defineProperty(newObject, propertyKey, {
        value: propertyValue,
        writable: true,
        enumerable: true,
        configurable: true
      });
      console.log("Object.defineProperty:", newObject);

      // 4. Short-hand for Object.defineProperty
      var config = {};
      var defineProp = function (obj, key, value) {
        config.value = value;
        Object.defineProperty(obj, key, config);
      };
      defineProp(newObject, propertyKey, propertyValue);
      console.log("Short-hand for Object.defineProperty:", newObject);

      // 5. Object.defineProperties
      var properties = {};
      properties[propertyKey] = {
        value: propertyValue,
        writable: true
      };
      Object.defineProperties(newObject, properties);
      console.log("Object.defineProperties:", newObject);

      // Get the property value
      const keyValue = newObject[propertyKey];
      output.innerHTML = `
        <p>The value of the property "${propertyKey}" is "${keyValue}".</p>
      `;
    });
  </script>
</body>
</html>