Web Storage API in HTML5

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Practical Projects and Examples

In this chapter, we will apply the concepts learned about localStorage and sessionStorage in practical projects. The exercises we will look at are designed to show how to use web storage in real situations, allowing users to save their preferences, work with forms, and more.

Project 1: Notes Application with `localStorage`

In this practical application, we will create a simple notes application that allows users to add, view, and delete notes. The notes will be stored in localStorage, so they will persist even if the user closes the browser or reloads the page.

Basic Structure of the Application

html

"This is the basic HTML for our notes application. It includes a text field to enter notes, a button to add them, and a list to display the saved notes."

Application Logic in JavaScript

javascript

"This is the JavaScript for our notes application. It includes functions to add, load, display, and delete notes, which are stored in localStorage. Each time a note is added or deleted, we update the list in the interface."

Project 2: Saving User Preferences in `localStorage`

In this project, we will create a simple interface that allows users to select the theme of the page and their preferred font size. Preferences will be stored in localStorage, allowing the page to remember the user's settings between sessions.

HTML Structure

html

"Here we have the HTML for the user preferences interface. It includes options to select the theme and font size."

JavaScript to Save and Load Preferences

javascript

"This JavaScript allows saving and loading user preferences. Preferences are applied to the page according to the selections saved in localStorage."

Project 3: Forms with Autosave using `sessionStorage`

This project will create a form with autosave, where the data will be temporarily stored in sessionStorage. This is useful so that users do not lose their information in case of an accidental page reload.

HTML Structure of the Form

html

"This is the HTML of a basic contact form with fields for name, email, and message. We will use JavaScript to implement autosave in sessionStorage."

JavaScript to Implement Autosave in `sessionStorage`

javascript

"This JavaScript automatically saves the content of each text field in sessionStorage every time the user types. When the page loads, the saved data is restored in the text fields."

Conclusion

In this chapter, we have developed several practical projects that demonstrate how to use localStorage and sessionStorage in real web applications. These projects will help you better understand the practical applications of web storage and how to manage data efficiently in different situations. In the next chapter, we will explore security and privacy aspects of web storage, a fundamental topic for protecting user data.

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