Vue and websocket

[YnievesDotNet]

I try to use the demo code, on one app and I use vue in this app, but the code is broken and I recive this error

Uncaught TypeError: Cannot read property 'addEventListener' of null

Thanks.

Yoinier.

[Hywan]

Maybe a little bit of code would help a lot :-).

[YnievesDotNet]

That is my code

...
        <input type="text" id="input" placeholder="Message…" />
        <hr />
        <pre id="output"></pre>
...
<script>
    var host   = 'ws://127.0.0.1:8000';
    var socket = null;
    var input  = document.getElementById('input');
    var output = document.getElementById('output');
    var print  = function (message) {
        var samp       = document.createElement('samp');
        samp.innerHTML = message + '\n';
        output.appendChild(samp);

        return;
    };

    input.addEventListener('keyup', function (evt) {
        if (13 === evt.keyCode) {
            var msg = input.value;

            if (!msg) {
                return;
            }

            try {
                socket.send(msg);
                input.value = '';
                input.focus();
            } catch (e) {
                console.log(e);
            }

            return;
        }
    });

    try {
        socket = new WebSocket(host);
        socket.onopen = function () {
            print('connection is opened');
            input.focus();

            return;
        };
        socket.onmessage = function (msg) {
            print(msg.data);

            return;
        };
        socket.onclose = function () {
            print('connection is closed');

            return;
        };
    } catch (e) {
        console.log(e);
    }
</script>
<script src="/js/app.js"></script>

Thanks, Yoinier.

[Pierozi]

Hello @YnievesDotNet
This error means the DomElement input is not yet ready when the Javascript is executed.
You should embed the javascript code on function and execute it after the onload event.