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observer_gmail.html
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observer_gmail.html
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<!DOCTYPE html>
<html>
<head>
<title>Email Inbox</title>
</head>
<body>
<h1>Email Inbox</h1>
<div id="inbox">
<h2>Inbox</h2>
<ul id="inboxList"></ul>
<button id="countBtn">Count Emails</button>
<button id="removeBtn">Remove Emails</button>
</div>
<form id="emailForm">
<h2>New Email</h2>
<label for="subjectInput">Subject:</label>
<input type="text" id="subjectInput" required>
<br>
<label for="bodyInput">Body:</label>
<textarea id="bodyInput" required></textarea>
<br>
<button type="submit">Send</button>
</form>
<script>
document.addEventListener('DOMContentLoaded', () => {
class Email {
constructor(subject, body) {
this.subject = subject;
this.body = body;
}
}
class EmailSubject {
constructor() {
this.emails = [];
this.observers = [];
}
addObserver(observer) {
this.observers.push(observer);
}
removeObserver(observer) {
const index = this.observers.indexOf(observer);
if (index !== -1) {
this.observers.splice(index, 1);
}
}
sendEmail(email) {
this.emails.push(email);
this.notifyObservers();
}
notifyObservers() {
for (const observer of this.observers) {
observer.update(this.emails);
}
}
clearEmails() {
this.emails = [];
this.notifyObservers();
}
}
class InboxObserver {
constructor(elementId) {
this.element = document.getElementById(elementId);
}
update(emails) {
const inboxList = this.element;
inboxList.innerHTML = '';
for (const email of emails) {
const li = document.createElement('li');
li.textContent = email.subject;
inboxList.appendChild(li);
}
}
}
const emailSubject = new EmailSubject();
const inboxObserver = new InboxObserver('inboxList');
emailSubject.addObserver(inboxObserver);
const form = document.getElementById('emailForm');
form.addEventListener('submit', (e) => {
e.preventDefault();
const subject = document.getElementById('subjectInput').value;
const body = document.getElementById('bodyInput').value;
const email = new Email(subject, body);
emailSubject.sendEmail(email);
form.reset();
});
const countBtn = document.getElementById('countBtn');
countBtn.addEventListener('click', () => {
const emailCount = emailSubject.emails.length;
alert(`Total Emails: ${emailCount}`);
});
const removeBtn = document.getElementById('removeBtn');
removeBtn.addEventListener('click', () => {
emailSubject.clearEmails();
const inboxList = document.getElementById('inboxList');
inboxList.innerHTML = '';
});
});
</script>
</body>
</html>