Learn the process of appending an item to a list using Vue.js

Question

Learn the process of appending an item to a list using Vue.js

Recently starting with vue.js and facing an issue:

data: {
        ws: null, 
        newMsg: '',
        username: null,    
        usersList: '' 
    },
        created: function() {
        var self = this;
        this.ws = new WebSocket('ws://' + window.location.host + '/room');
        this.ws.addEventListener('message', function(e) {
            var msg = JSON.parse(e.data);
                if (msg.Message == "joined" ) {
                self.usersList.push(msg.Name); // <--Issue persists here 
              }


        });
    },

However, encountering an error displayed in the browser console:

Uncaught TypeError: self.usersList.push is not a function

Even after trying to use a static string instead of msg.Name, the error remains the same.

What could be the problem here and how can it be resolved?

javascript vue.js

Answer 1

Answer №1

1. Utilize the userList:[] as an array and employ the push() method. For further information, visit: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push

2. If the content of e.data is in array format, such as [1,2,3,4], you can utilize the concat method to merge two arrays.

var arr1 = [1,2,3,4];
var arr2 = [5,6,7];
var arr = arr1.concat(arr2); // [1, 2, 3, 4, 5, 6, 7]

Alternatively, you can use

Array.prototype.push.apply(arr1, arr2);

to add all elements from a second array.

var arr1 = [1,2,3,4];
var arr2 = [5,6,7];
Array.prototype.push.apply(arr1, arr2);
console.log(arr1);//[1, 2, 3, 4, 5, 6, 7]

Answer 2

1. Utilize the userList:[] as an array and employ the push() method. For further information, visit: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push

2. If the content of e.data is in array format, such as [1,2,3,4], you can utilize the concat method to merge two arrays.

var arr1 = [1,2,3,4];
var arr2 = [5,6,7];
var arr = arr1.concat(arr2); // [1, 2, 3, 4, 5, 6, 7]

Alternatively, you can use

Array.prototype.push.apply(arr1, arr2);

to add all elements from a second array.

var arr1 = [1,2,3,4];
var arr2 = [5,6,7];
Array.prototype.push.apply(arr1, arr2);
console.log(arr1);//[1, 2, 3, 4, 5, 6, 7]

Learn the process of appending an item to a list using Vue.js

Answer №1

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