An individual in a chat App's UserList experiencing issues with incorrect CSS values. Utilizing Jquery and socketio to troubleshoot the problem

Currently, I am testing a new feature in a chat application that includes displaying a user list for those who have joined the chat. The challenge is to change the color of a specific user's name on the list when they get disconnected or leave the chat. For example, if Andy and Rubin are in the chat, and Rubin leaves, only Rubin's name should change color while Andy's name remains the same. However, I am facing an issue where when a user disconnects, the color change applies to all members on the list instead of just the one who left.

server.js

socket.on('disconnect',function(data){
    console.log('user disconnected');
    if(!socket.nickname)   
         return;
      socket.broadcast.emit('userDisconnect',{nick:socket.nickname});  
})

chat.js

socket.on('userDisconnect',function(data){
    //  var str = [];
    // str.push(data.nick)
    // for(var i= 0;i<data.length;i++){
    //  str = data.nick[i]
    //  }
    //  $users.text(data.nick).css("color","red")   //disconnected user is only reflected on the list,rest of them vanish
    $users.val(data.nick).css("color","red")
})

Note: Various attempts were made as outlined in the commented sections of the code.

My expectation was for only the username of the user leaving to change color in the list, but currently, when any user leaves, the color adjustment affects all users on the list.

Answer №1

When referring to the jQuery val() documentation, it clearly states:

Retrieve the current value of the first matched element or set the value for all matched elements.

https://api.jquery.com/val/

Essentially, what you are doing is assigning the value data.nick to all users. The same concept applies when using the text() method.

It would be more efficient to identify users by their unique id, which could be their nickname in this scenario. However, you must assign this id during the user rendering process. Once you have done that, you can implement code similar to the following:

socket.on('userDisconnect',function(data){
    $(`#id_${data.nick}`).css("color","red")
})

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