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How to build Event calendar app with Lovable?

Discover how to build an event calendar app with Lovable. Our step-by-step guide offers expert tips, clear instructions, and best practices to bring your scheduling tool to life.

Matt Graham, CEO of Rapid Developers

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How to build Event calendar app with Lovable?

 
Project Setup and File Structure
 

  • Create a new Lovable project.
  • In the project, add the following files:
    • index.html – This will serve as the main HTML file.
    • assets/eventCalendar.js – This file will contain the JavaScript code to initialize and render the event calendar.
    • assets/eventCalendar.css – This file will contain styles for the calendar.
  • Since Lovable does not have a terminal, dependencies are added by inserting CDN links directly into your HTML code.

 
Creating the Main HTML File
 

  • In your project root, open or create the index.html file.
  • Insert the following code snippet into index.html:



  
    
    Event Calendar App
    
    
    
    
  
  
    
    

 
Adding the Event Calendar JavaScript Code
 

  • Within your project, navigate to the assets folder and create a new file named eventCalendar.js.
  • Copy and paste the following code snippet into eventCalendar.js:

// Wait for the DOM to load before initializing the calendar
document.addEventListener('DOMContentLoaded', function() {
  // Get the calendar container element
  var calendarEl = document.getElementById('calendar');

  // Initialize FullCalendar with basic configuration
  var calendar = new FullCalendar.Calendar(calendarEl, {
    initialView: 'dayGridMonth',
    headerToolbar: {
      left: 'prev,next today',
      center: 'title',
      right: 'dayGridMonth,timeGridWeek,timeGridDay'
    },
    // Example events; update these with your event data
    events: [
      {
        title: 'Meeting',
        start: '2023-10-07T10:30:00',
        end: '2023-10-07T12:30:00'
      },
      {
        title: 'Conference',
        start: '2023-10-14',
        allDay: true
      }
    ]
  });
  
  // Render the calendar in the container
  calendar.render();
});

 
Creating the Calendar Styles
 

  • In the assets folder, create a new file named eventCalendar.css.
  • Add the following styles to ensure the calendar displays correctly:

/_ Basic styling for the calendar container _/
#calendar {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 10px;
}

 
Managing Dependencies without a Terminal
 

  • Lovable does not have a terminal to install packages, so all external dependencies must be included manually.
  • We are using FullCalendar for the event calendar. Its CSS and JavaScript are added directly into index.html via CDN:





 
Testing Your Event Calendar App
 

  • Save all the files you have created.
  • Preview your Lovable project within the platform. The event calendar should render in the area designated by the <div id="calendar"> container.
  • If the calendar does not appear, verify that the paths to the assets (assets/eventCalendar.js and assets/eventCalendar.css) are correct.

 
Customizing Your Event Calendar
 

  • To add or update event information, edit the events array inside assets/eventCalendar.js.
  • You can modify the calendar settings (such as views, header, etc.) within the FullCalendar initialization code.
  • Adjust styling by enhancing the CSS in assets/eventCalendar.css as needed.

 
Deploying Updates
 

  • Each time you make changes to your files, save them in the Lovable editor.
  • Preview the project in Lovable to ensure all changes render correctly.
  • Share your project URL if Lovable allows live sharing or embedding into your website.

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How to build an events API that handles one-time and recurring events


const express = require('express');
const router = express.Router();
const mongoose = require('mongoose');
const moment = require('moment');

// Event schema definition
const EventSchema = new mongoose.Schema({
  title: String,
  description: String,
  startTime: Date,
  endTime: Date,
  isRecurring: Boolean,
  recurrenceRule: String // e.g., "FREQ=WEEKLY;BYDAY=MO"
});
const Event = mongoose.model('Event', EventSchema);

// Helper: Groups events by date (YYYY-MM-DD)
function groupEventsByDate(events) {
  return events.reduce((acc, event) => {
    const dateKey = moment(event.startTime).format('YYYY-MM-DD');
    if (!acc[dateKey]) acc[dateKey] = [];
    acc[dateKey].push(event);
    return acc;
  }, {});
}

// API endpoint: Retrieve events (both one-time and recurring) within a date range
router.get('/api/events', async (req, res) => {
  try {
    let { start, end } = req.query;
    start = new Date(start);
    end = new Date(end);

    // Fetch non-recurring events in the specified range
    const regularEvents = await Event.find({
      isRecurring: false,
      startTime: { $gte: start, $lte: end }
    }).exec();

    // Fetch all recurring events (to be expanded according to recurrence rules)
    const recurringEventsRaw = await Event.find({ isRecurring: true }).exec();
    let recurringEvents = [];

    recurringEventsRaw.forEach(event => {
      // For this example, assume a simple weekly recurrence
      let occurrence = moment(event.startTime);
      // Adjust time difference from startTime to endTime for event duration
      const duration = moment(event.endTime).diff(moment(event.startTime));
      while (occurrence.isBefore(end)) {
        if (occurrence.isSameOrAfter(moment(start))) {
          recurringEvents.push({
            title: event.title,
            description: event.description,
            startTime: occurrence.toDate(),
            endTime: moment(occurrence).add(duration, 'milliseconds').toDate(),
            isRecurring: true,
            recurrenceRule: event.recurrenceRule
          });
        }
        occurrence.add(1, 'weeks');
      }
    });

    const allEvents = regularEvents.concat(recurringEvents);
    const groupedEvents = groupEventsByDate(allEvents);
    res.json(groupedEvents);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;

How to sync Lovable events into your calendar app


const express = require('express');
const axios = require('axios');
const router = express.Router();
const CalendarEvent = require('./models/CalendarEvent'); // Mongoose model for events

// POST endpoint to synchronize events from Lovable's external API into the local database
router.post('/api/sync/lovable', async (req, res) => {
  try {
    const { apiToken, fromDate, toDate } = req.body;

    // Build the external API URL with date range query parameters
    const externalApiUrl = `https://api.lovable.com/v1/events?from=${encodeURIComponent(fromDate)}&to=${encodeURIComponent(toDate)}`;

    // Setup request headers including the API token for authentication
    const config = {
      headers: {
        'Authorization': `Bearer ${apiToken}`,
        'Accept': 'application/json'
      }
    };

    // Fetch events from the external Lovable API
    const { data } = await axios.get(externalApiUrl, config);
    const externalEvents = data.events;

    // Transform the external event format to match local CalendarEvent schema
    const eventsToSync = externalEvents.map(item => ({
      title: item.event\_title,
      description: item.event\_description,
      startTime: new Date(item.event\_start),
      endTime: new Date(item.event\_end),
      externalId: item.id,
      source: 'lovable'
    }));

    // Upsert each event in the local database
    for (const event of eventsToSync) {
      await CalendarEvent.findOneAndUpdate(
        { externalId: event.externalId },
        event,
        { upsert: true, new: true }
      );
    }

    res.json({ success: true, syncedCount: eventsToSync.length });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;

How to resolve scheduling conflicts in your Lovable event calendar app


const express = require('express');
const router = express.Router();
const moment = require('moment');
const Event = require('./models/Event'); // Mongoose model for events

// POST endpoint: Adjust an event's schedule while resolving overlaps with Lovable-sourced events
router.post('/api/events/resolve-conflicts', async (req, res) => {
  try {
    const { eventId, newStartTime, newEndTime } = req.body;
    const proposedStart = moment(newStartTime);
    const proposedEnd = moment(newEndTime);

    if (!proposedStart.isValid() || !proposedEnd.isValid() || !proposedEnd.isAfter(proposedStart)) {
      return res.status(400).json({ error: 'Invalid date range provided.' });
    }

    const event = await Event.findById(eventId);
    if (!event) {
      return res.status(404).json({ error: 'Event not found.' });
    }

    const conflictingEvents = await Event.find({
      \_id: { $ne: eventId },
      source: 'lovable',
      startTime: { $lt: proposedEnd.toDate() },
      endTime: { $gt: proposedStart.toDate() }
    });

    if (conflictingEvents.length > 0) {
      return res.status(409).json({
        error: 'Conflict detected with existing Lovable events.',
        conflicts: conflictingEvents
      });
    }

    event.startTime = proposedStart.toDate();
    event.endTime = proposedEnd.toDate();
    await event.save();

    res.json({ success: true, event });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;

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Connect with our team to unlock the full potential of no-code solutions with a no-commitment consultation!

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Matt Graham, CEO of Rapid Developers

Book a call with an Expert

Starting a new venture? Need to upgrade your web app? RapidDev builds application with your growth in mind.

Book a free No-Code consultation

Best Practices for Building a Event calendar app with AI Code Generators

 
Understanding the Project Requirements and Goals
 

  • Begin by defining what your event calendar app will do. The goal is to allow users to create, view, and manage events easily.
  • Decide on key features, such as event reminders, recurring events, and a user-friendly interface.
  • Identify where the AI code generator will help you, whether it’s for writing UI components, generating API endpoints, or even suggesting improvements in your logic.

 
Gathering Prerequisites
 

  • Make sure you have basic knowledge of web development concepts such as HTML, CSS, and JavaScript.
  • Get familiar with an AI code generator tool. Many tools offer code suggestions based on natural language prompts.
  • Have access to a development environment on your local machine or use an online IDE that supports web development (e.g., CodeSandbox, Replit).

 
Planning the Application Architecture
 

  • Decide on the structure of your app. Typically, an event calendar app will have the following components:
    • A front-end interface for interacting with the calendar and events.
    • A back-end server to store event details (using a database).
    • API endpoints to manage communication between the front-end and back-end.
  • Create a flowchart or diagram that outlines how a user will interact with the app.

 
Setting Up Your Development Environment
 

  • Install a code editor like Visual Studio Code to facilitate development.
  • Set up your project folder structure. For example:
    • A folder for the front-end (HTML, CSS, JavaScript files).
    • A folder for the back-end (code files and database configuration).
  • Create a new file structure. For example:
    
    project-folder/
    ├── frontend/
    │   ├── index.html
    │   ├── styles.css
    │   └── app.js
    └── backend/
        ├── server.js
        └── database.js
        

 
Integrating the AI Code Generator
 

  • Choose an AI code generator tool or service that you feel comfortable with.
  • Use natural language prompts to generate components. For instance, you can ask the generator: "Generate a responsive HTML layout for an event calendar."
  • Examine the code produced by the AI tool, ensuring it meets security standards and is easily maintainable. You might need to adjust variable names or structure.
  • Test the generated code segments individually before integrating them into your project.

 
Implementing Core Event Calendar Features
 

  • Develop the event creation form. This should allow users to enter event details like title, date, time, and location. For instance, use HTML for form structure:
    
    <form id="create-event">
      <label for="event-title">Event Title:</label>
      <input type="text" id="event-title" name="eventTitle" required>
      
    

    <label for="event-date">Date:</label>
    <input type="date" id="event-date" name="eventDate" required>

    <label for="event-time">Time:</label>
    <input type="time" id="event-time" name="eventTime" required>

    <button type="submit">Create Event</button>
    </form>



  • Implement JavaScript logic to capture form data and update the calendar display dynamically. For example:

    document.getElementById('create-event').addEventListener('submit', function(event) {
    event.preventDefault();
    const title = document.getElementById('event-title').value;
    const date = document.getElementById('event-date').value;
    const time = document.getElementById('event-time').value;

    // Add functionality to create a new event using the entered data
    console.log('New Event:', { title, date, time });
    });



  • Integrate the AI generator again for handling repetitive code tasks, such as generating calendar grids or event list views.

 
Setting Up the Back-End and Database
 

  • Decide on a back-end technology (Node.js, Python with Flask/Django, etc.) that you are comfortable with or that your AI code generator supports.
  • Create API endpoints that the front-end will use to add, update, and retrieve events. For example, in Node.js:
    
    const express = require('express');
    const app = express();
    app.use(express.json());
    
    

    let events = [];

    app.post('/api/events', (req, res) => {
    const event = req.body;
    events.push(event);
    res.status(201).json(event);
    });

    app.get('/api/events', (req, res) => {
    res.json(events);
    });

    app.listen(3000, () => {
    console.log('Server running on port 3000');
    });



  • Set up a simple database if required. For early development, a JSON file or an in-memory database might be sufficient.

 
Testing and Debugging Your Application
 

  • Use browser developer tools to check for issues with HTML, CSS, and JavaScript.
  • Test all user flows: creating an event, editing an event, and deleting an event.
  • If the AI-generated code produces errors, compare it against your reference work or documentation.
  • Write simple tests to ensure that API endpoints return the correct data.

 
Deploying Your Event Calendar App
 

  • Once development and initial testing are complete, choose a deployment platform that fits your app's needs. Options include Heroku, Vercel, or Replit.
  • Configure your code to bind to the appropriate port as required by your deployment platform. For example, in Node.js:
    
    const port = process.env.PORT || 3000;
    app.listen(port, () => {
      console
    

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