Ensuring Selected Options are Remembered by the Browser Using LocalStorage

Using LocalStorage to Remember Selected Options in a Browser

In web development, it's often useful to allow users to customize their experience. One common feature is the ability to remember a user's selection, such as a preferred font size, even after they leave and return to the website. This can be achieved using the localStorage feature in JavaScript. Let's explore how to implement this functionality.

The HTML and JavaScript Code
The provided code demonstrates how to use localStorage to remember the selected font size in a dropdown menu. Here's a breakdown of the key components:
<label for="selectfontsize">Select Font Size:</label>
<select id="selectfontsize">
  <option value="12px">12px</option>
  <option value="14px">14px</option>
  <option value="16px">16px</option>
  <option value="18px">18px</option>
  <option value="20px">20px</option>
</select>

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
  $(document).ready(function() {
    // Load the saved font size from localStorage
    const savedFontSize = localStorage.getItem('fontSize');
    if (savedFontSize) {
      $('#selectfontsize').val(savedFontSize);
      $('body').css('font-size', savedFontSize); // Apply the saved font size
    }

    // Save the selected font size to localStorage when changed
    $('#selectfontsize').on('change', function() {
      const selectedFontSize = $(this).val();
      localStorage.setItem('fontSize', selectedFontSize);
      $('body').css('font-size', selectedFontSize); // Apply the selected font size
    });
  });
</script>


Explanation of the Code
1. HTML Select Element: The dropdown menu allows users to select a font size from a range of options.
2. JavaScript:
	- On page load, the script checks if a font size has been previously saved in the localStorage. If so, it applies the saved font size to the body of the page.
	- When the user selects a new font size, the script updates the localStorage with the new value and applies the selected font size to the body.

Conclusion

By using localStorage, web developers can enhance user experience by allowing the browser to remember user preferences, such as selected options in dropdown menus. This can lead to a more personalized and user-friendly browsing experience.

Remember, the use of localStorage should be carefully considered, especially when dealing with sensitive information, as it stores data locally on the user's device.

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Last update on Jul 24, 2024

Tags: jquery, select, localstorage, select, select option