How to Preserve Menu State on Page Reload using Modern Browsers?

Persisting Menu State on Page Reload

Problem Statement:

You have a menu with multiple links, where:

• On hover, the selected link translates 1.5em to the right.
• On click, the clicked link stays in the translated position, even after the page reloads, until a different link is selected.

Solution: Leveraging localStorage

To achieve the desired menu behavior, we can utilize HTML5 localStorage to store and retrieve the state of the selected link. Here's a step-by-step guide:

1. Create a localStorage Variable: Create a variable to store the ID or class of the selected link. For example:

<code class="js">const selectedLinkId = localStorage.getItem('selectedLinkId');</code>

2. Update Menu on Page Load: On page load, check if the selectedLinkId variable exists. If it does, select the corresponding link and apply the translated position:

<code class="js">if (selectedLinkId) {
  $(`#${selectedLinkId}`).addClass('hovered').siblings().removeClass('hovered');
}</code>

3. Save Menu State on Link Click: When a link is clicked, save the ID or class of the clicked link to the localStorage variable:

<code class="js">$('#menuLinks').on('click', function() {
  localStorage.setItem('selectedLinkId', $(this).attr('id'));
});</code>

4. Cleanup on Page Change: If you want to reset the menu state when a different page is loaded, add an event listener to the pageshow event and clear the localStorage variable:

<code class="js">window.addEventListener('pageshow', function() {
  localStorage.removeItem('selectedLinkId');
});</code>

Pros and Cons of Storage Location:

• localStorage:

  • Pros: Persistent across sessions and browser tabs, accessible by JavaScript.
  • Cons: Limited storage capacity, user can delete data manually.

• Server-side:

  • Pros: Unlimited storage capacity, more secure.
  • Cons: Requires additional setup and retrieval is more complex.

Ultimately, the best storage location depends on your specific requirements. localStorage is a suitable option for persistent user settings that do not require significant amounts of storage.

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