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Скачать или смотреть How to Make sessionStorage Data Reactive in Vue.js and Vuex

  • vlogize
  • 2025-09-19
  • 2
How to Make sessionStorage Data Reactive in Vue.js and Vuex
Object from sessionStorage not reactive in vuejs / vuexvue.jsvuexsession storagevuejs3
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Описание к видео How to Make sessionStorage Data Reactive in Vue.js and Vuex

Discover how to effectively manage `sessionStorage` data in Vue.js and Vuex to ensure that your shopping cart reflects changes in real-time, even after page refreshes.
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This video is based on the question https://stackoverflow.com/q/62409703/ asked by the user 'alkadelik' ( https://stackoverflow.com/u/4202997/ ) and on the answer https://stackoverflow.com/a/62414282/ provided by the user 'IVO GELOV' ( https://stackoverflow.com/u/5962802/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Object from sessionStorage not reactive in vuejs / vuex

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Solving Reactivity Issues with sessionStorage in Vue.js and Vuex

When building a web application, persistence of data is crucial for a smooth user experience. One common scenario arises when developers use sessionStorage to retain the content of a shopping cart. However, an issue can occur where the data stored in sessionStorage does not reflect in the application's DOM until a new item is added to the cart. If you've faced this challenge while using Vue.js and Vuex, you're not alone! Let's dive into the problem and explore a clear solution.

Understanding the Problem

In your case, you want the contents of the shopping cart to be automatically loaded from sessionStorage and displayed when the user refreshes the page. You correctly retrieve the cart data in the beforeUpdate lifecycle hook, but the changes aren't reflected in the DOM until another change is made. This happens because of how you're modifying the Vuex state upon restoring the cart data.

Here's a simplified version of the code snippet you provided:

[[See Video to Reveal this Text or Code Snippet]]

While this code attempts to restore the cart, the problem lies in the restoreCart() mutation you defined:

[[See Video to Reveal this Text or Code Snippet]]

What's the Issue Here?

The main problem with your restoreCart mutation is that you're trying to push an entire cart object into the state.cart array. This operation does not replace the current cart; instead, it adds the old cart as a single item. Thus, the UI does not update to reflect the cart's contents accurately until an additional item is added.

The Effective Solution

To properly load the cart data from sessionStorage into your Vuex state and ensure reactivity, you need to assign the contents of found_cart directly to the state.cart rather than pushing it as a new item. Here’s how to fix it:

Step 1: Update Your Mutation

Modify your restoreCart() mutation like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Displaying the Cart Contents Reactively

Now that you have correctly updated the state, make sure your Vue template is set up to display the cart items. You can loop through the cart in your template like this:

[[See Video to Reveal this Text or Code Snippet]]

Summary of Changes

In the restoreCart() mutation, replace the old cart with the new data instead of pushing it.

Ensure your front-end template correctly binds to the Vuex store state to reflect changes immediately.

Conclusion

By making these adjustments, your application will effectively load the cart data from sessionStorage upon refresh and update the DOM reactively. This will not only enhance user experience but also ensure data integrity across user sessions. Remember, managing the Vuex state correctly is essential for maintaining reactivity in your Vue.js application. Now, you're all set to improve your shopping cart functionality! Happy coding!

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