So I'm trying to create a chat application like messenger. When I press the button, a new conversation should be started. I want to add a list item in my overview bar on the left but there can only be one selected, and that one has the 'history-item-selected' classname. So every new convo gets that classname, while the others ones get another classname to change it's appearance but it won't work.
const newConvoButton = document.getElementById("newmessage");
const addNewConvo = (e) => {
e.preventDefault();
const myMessages = document.getElementById('history');
let newListItem = document.createElement('li');
newListItem.textContent = "user " + Math.floor(Math.random(2 - 100) * 100);
myMessages.appendChild(newListItem);
if (newListItem.classList = 'history-item-selected') {
newListItem.classList.add('history-item-selected');
} else {
newListItem.classList.add('history-item')
};
};
newConvoButton.addEventListener('click', addNewConvo);<main>
<div id="top">
<span>
<h2>My conversations</h2>
</span>
<button type="submit" id="newmessage">+</button>
</div>
<div id="messagecontainer">
<ul id="history"></ul>
<id id="chatscreen">
<ul id="messages">
<li>yolo</li>
</ul>
<div id="messagebottom">
<input type="text" placeholder="Start met typen" size="28" height="auto"> <button type="submit">Send</button>
</div>
</id>
</div>
</main>There is a "tautological" way to do what you are trying to do.
var addNewConvo = (e)=> {
var nodes = document.querySelectorAll(".history-item-selected");
nodes.forEach(function(elem) {
this.classList.remove("history-item-selected");
});
e.target.classList.add("history-item-selected");
}
In your CSS, you should have something like
.history-item {
/*Styles for history-item*/
}
.history-item.history-item-selected {
/*Styles for elements with both */
}