Скачать или смотреть How to Save Drag and Drop to Local Storage in JavaScript

Learn how to easily save and retrieve `drag and drop` positions using Local Storage in JavaScript, perfect for beginners!
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How to Save Drag and Drop to Local Storage in JavaScript

If you're diving into JavaScript, you might have come across drag-and-drop functionality. While you may have successfully implemented moving elements around on the screen, the challenge often arises when you want to save those positions so they remain in place after a page reload. In this guide, we'll walk through the steps to achieve this using Local Storage.

Understanding the Problem

You may have a simple drag-and-drop feature as shown in this snippet:

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When you drag the element (a red block in this case), the position changes based on your mouse movements. However, upon refreshing the page, you want the block to return to its last dropped position. This requires us to store the location in a persistent way—hence the use of Local Storage.

Implementing Local Storage

Step 1: Capture the Position on Mouse Up

The first step in solving our problem is to listen for the mouseup event. When the mouse is released, we want to save the current positions of the draggable element (both top and left properties) into Local Storage.

Here's a simple way to do that:

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

Step 2: Retrieve the Position on Page Load

Each time the page is loaded, we want to check if we have saved positions in Local Storage and apply them so that our block appears where it was last dropped. We can achieve this with the following code:

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

Step 3: Optimize with Combined Coordinates

For a quicker approach, you can save both the top and left coordinates as a single string separated by a comma. This makes your code more concise:

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

And when loading the coordinates:

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

Summary

In summary, saving the position of a draggable element using Local Storage in JavaScript involves two main tasks: capturing the position on mouse release and retrieving it upon page load. Here’s a quick recap of the handy steps:

Capture the top and left positions on mouseup and save them in Local Storage.

Retrieve these values when the page loads and apply them to your element.

Implementing these steps allows you to create a more user-friendly experience by maintaining the state of your drag-and-drop elements.

Now that you know how to save drag and drop functionality in local storage, you're one step closer to mastering JavaScript! Happy coding!