我正在尝试这样做,以便当nodejs在irc聊天中触发某个内容时,html页面(在*:3000上运行)将执行某些JavaScript。当我尝试实现这一点时,它会运行代码,但不会执行showDiv();
我在chrome中使用localhost:3000打开它。
当我输入时,为什么ID为“welcome”的div不会变为可见!跟随正在拾取的IRC。
完整代码:
的index.html:
<!doctype html>
<html>
<head>
<title>Family Fortunes</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font: 13px Helvetica, Arial; }
form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
#messages { list-style-type: none; margin: 0; padding: 0; }
#messages li { padding: 5px 10px; }
#messages li:nth-child(odd) { background: #eee; }
#welcome {display:none;}
</style>
<script>
var socket = io();
function showDiv() {
document.getElementById('welcome').style.display = "visible";
}
</script>
<script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
<script src="http://code.jquery.com/jquery-1.11.1.js"></script>
</head>
<body>
<button onclick="showDiv()">Click me</button>
<div id="welcome"> WELCOME</div>
<script src="/socket.io/socket.io.js"></script>
<script src="example.js"></script>
</body>
</html>
Example.js:
//http://www.schmoopiie.com/docs/twitch-irc/Commands/Action
//SOCKET.IO Setup
var io = require('socket.io')(http);
var app = require('express')();
var http = require('http').Server(app);
io.on('connection', function(socket){
console.log('a user connected');
socket.on('disconnect', function(){
console.log('user disconnected');
});
});
http.listen(3000, function(){
console.log('listening on *:3000');
});
app.get('/', function(req, res){
res.sendfile('index.html');
});
//Node.JS Setup
var irc = require('twitch-irc');
var api = require('twitch-irc-api');
//Declare Global Variable with NO attributes.
var Follower = {};
var LastFollower = {};
//API Callout
setInterval(function(){
api.call({
channel: null,
method: 'GET',
path: '/channels/greatbritishbg/follows',
options: {
limit: 1,
offset: 0
}
}, function(err, statusCode, response) {
if (err) {
console.log(err);
return;
}
Follower.response = String(response.follows[0].user.display_name);
//console.log('Returning Current follower Loop: ' + Follower.response);
});
}, 1000);
//IRC Connect
var clientOptions = {
options: {
debug: true,
debugIgnore: ['ping', 'chat', 'action']
},
identity: {
username: 'greatbritishbg',
password: 'oauth:'
},
channels: ['greatbritishbg']
}
var client = new irc.client(clientOptions);
client.connect();
function showDiv() {
document.getElementById('welcome').style.display = "visible";
}
//Commands
client.addListener('chat', function (channel, user, message) {
console.log(user.username + ': ' + message);
if (message.toLowerCase() === '!follow') {
client.say(channel, 'Latest Follower: ' + Follower.response).then(function() {
showDiv();
});
}
});
答案 0 :(得分:1)
我认为你在NodeJS服务器端脚本之间感到困惑, 和JS客户端。
您不能直接从客户端直接调用“example.js”,这是您的服务器端脚本。
您必须将其作为NodeJS http服务器启动,基本上使用终端中的node
命令进行开发(在生产中,可能使用foreverjs):
Linux / OS X:
cd /path/to/your/project/folder
node example.js
视窗:
dir \path\to\your\project\folder
node example.js
然后,在此服务器端脚本上,您必须触发您感兴趣的websockets事件。
(注意初始化的顺序:io
应该在http服务器之后初始化)
例如,您可emit
全局io.emit(eventName, arguments)
或者您也可以在emit
namespace
事件中收到emit
socket
,甚至io
一个connection
:
socket.emit(eventName, arguments)
eventName
应该是客户端JS将侦听的字符串
arguments
可以是您想要的任何内容
The documentation overview of socket.io充满了非常好的例子。
示例:
服务器侧强>
// Send it to a specific socket
var sockets = {};
var id = 0;
io.on('connection', function (socket) {
// Manage something with the socket
clients.push({
id: id++,
socket: socket
});
});
// And when an internal server-side thing happens...
followersManager.on('connection', function (followerName) {
// Find the given socket in any way
var socket = clients.find(function (client) {
return client.id == 1;
}, this);
// Then use this special socket
socket.emit('followers.new', followerName);
});
// Note that Array.prototype.find is an experimental feature of ES6.
// It can be easily fixed with the polyfill for oldest versions:
require('array.prototype.find');
// OR you can also emit it to all connected sockets
var followerName = 'Foo';
io.emit('followers.new', followerName);
请记住,在服务器端,您无法调用客户端功能!
然后,在客户端(应该是example.js之外的另一个文件),您只需要监听这个给定的事件:
<强>客户端强>
function showDiv() {
document.getElementById('welcome').style.display = "visible";
}
var socket = io();
socket.on('followers.new', function (followerName) {
showDiv();
// Do something with eventual arguments here, such as retrieve a new follower's name and append it to a list...
alert('New follower: ' + followerName);
}
答案 1 :(得分:0)
我认为你做了很多错事,但我会尽力帮助你提供一些建议。
首先,我没有以正确的方式启动socket.io。
// This code is on server
// Create express app
var app = require('express')();
// Get http server
var server = require('http').Server(app);
// Create socket.io server
var io = require('socket.io')(server);
其次,您不在服务器上发出socket.io事件 对我来说,你必须在客户端监听器中执行此操作
// This code is on server
// To send an event from server to client you have to use io
io.emit('follow');
第三,您没有在客户端上收到活动
// This code is on client
// To receive an event on client you have to use object return by io
var socket = io();
socket.on('follow', function() {
showDiv();
}
答案 2 :(得分:-1)
确保div #welcome
的CSS没有
visibility: hidden;
简单地将其显示为块将无法正常工作,因为它实际上仍然隐藏在CSS中。
如果它被隐藏,那么您可以在Javascript中添加另一行:
function showDiv() {
document.getElementById('welcome').style.display = "block";
document.getElementById('welcome').style.visibility = "visible";
}
同时检查高度和宽度是否设置等。