How to let users add mail contacts

To allow users to add mail contacts in your application, you'll need to provide a user interface for them to input the contact's email address and other relevant information. Here's a general outline of the steps:

  1. Create a form: Design a form that allows users to input the contact's email address, name, and any other relevant information (e.g., company, job title, phone number, etc.). You can use HTML, CSS, and JavaScript to create the form.
  2. Validate user input: Use JavaScript to validate the user's input to ensure that the email address is valid and the other information is correctly formatted. You can use regular expressions to validate the email address.
  3. Store the contact information: When the user submits the form, store the contact information in a database or a data storage system. You can use a relational database management system like MySQL or PostgreSQL, or a NoSQL database like MongoDB.
  4. Link the contact to the user's account: Associate the contact information with the user's account in your application. This will allow you to retrieve the contact information later and display it in the user's contact list.
  5. Display the contact list: Create a page or section in your application that displays the user's contact list. You can use a table, list, or other layout to display the contact information.

Here's some sample HTML and JavaScript code to get you started:

<!-- Contact form -->
<form id="contact-form">
  <label for="email">Email:</label>
  <input type="email" id="email" name="email"><br><br>
  <label for="name">Name:</label>
  <input type="text" id="name" name="name"><br><br>
  <label for="company">Company:</label>
  <input type="text" id="company" name="company"><br><br>
  <input type="submit" value="Add Contact">
</form>

<!-- JavaScript code to validate and store the contact information -->
<script>
  const contactForm = document.getElementById('contact-form');
  contactForm.addEventListener('submit', (e) => {
    e.preventDefault();
    const email = document.getElementById('email').value;
    const name = document.getElementById('name').value;
    const company = document.getElementById('company').value;
    // Validate the email address using a regular expression
    const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
    if (!emailRegex.test(email)) {
      alert('Invalid email address');
      return;
    }
    // Store the contact information in a database or data storage system
    //...
    // Link the contact to the user's account
    //...
  });
</script>

This is just a basic example to get you started. You'll need to modify the code to fit your specific requirements and integrate it with your application's backend and database.

Additionally, you may want to consider implementing features such as: