[英]How do I send HTML in chunks using Node.js and Express?
I want to send the <head>
containing stylesheets before processing the rest of the page. 我想在处理页面的其余部分之前发送包含样式表的
<head>
。 In PHP, I could use ob_flush()
. 在PHP中,我可以使用
ob_flush()
。
I tried doing something like this: 我尝试过这样的事情:
app.set('view engine','ejs');
app.get('*',function(req,res){
res.writeHead(200,{'Content-Type':'text/html'});
res.write('<!doctype...<link rel=stylesheet...');
doDBStuff()
.then(function(data){
res.render('index',{...}); // uses EJS for templating
});
});
However, the res.render()
part does not get sent. 但是,
res.render()
部分不会被发送。 Is there a built-in way to send chunked data? 是否有内置的方式来发送分块数据?
One way to do it would be to manually load the EJS files and manually process them. 一种方法是手动加载EJS文件并手动处理它们。 I would also have to manually send the appropriate headers.
我还必须手动发送相应的标头。 I prefer a build-in method if it exists.
如果存在,我更喜欢内置方法。
Here's a simple PoC that does what you want: 这是一个简单的PoC,可以满足您的需求:
var express = require('express');
var app = express();
var server = app.listen(3000);
app.set('views', 'views');
app.set('view engine', 'ejs');
app.get('/', function (req, res, next) {
res.write('<!-- prefix -->');
setTimeout(function() {
res.render('index', { ... }, function(err, html) {
// TODO: handle errors
res.end(html);
});
}, 1000);
});
Note that it uses the "callback variant" of res.render()
, which can be used to just render a template without sending back a response (if you don't do it this way, res.render()
will generate an error). 请注意,它使用
res.render()
的“回调变体”,它可用于仅渲染模板而不发回响应(如果不这样做, res.render()
将生成错误)。 Alternatively, you can use app.render()
which does the same. 或者,您可以使用
app.render()
。
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