nodejs / express / oboe.js & pug:获取节点()事件来更新dom

Question

第一次使用节点和模板引擎(是的，我知道，糟糕的地方，“开始”，但无论如何)。我正在从一个json流构建一些内容，最后我想将这些内容吐出到我的html页面中的div中，如下所示(更新的)高速公路片段：

app.get('/foo', function (req, res) {

  //... get my stream called 'mystream'

  //... get ready to append content for items found in json stream
  var htmlbuf = "";

  //now process the json stream:
  oboe(mystream)
  .node('{bar}', function(aBar){
    //eventually, I'd like to actually append individual new DOM elements,
    //but for now I'll settle for just spitting out raw html:
    var buffer = '<p>Found a bar with name'+ aBar.name + '</p>';
    res.render('index', {itemsfound: htmlbuf});
    });
});

index.pug：

doctype html
html
    head
        link(type='text/css', rel='stylesheet', href='./css/main.css')
        title Hello
    body
        h1 Hello world!
        div#results.listing
            items= itemsfound

我得到错误‘错误:不能设置标题后，他们被发送’。所以我认为问题是oboe.node()在任何时候都在发射，而我没有在正确的时间发送响应内容？连接oboe.node()事件所需的代码/框架是什么，以便它们能够在我的pug模板中目标或创建dom元素并正确地发送响应？谢谢。

Answer 1

你需要这样做：

app.get('/foo', function (req, res, next) {

  //... get my stream called 'mystream'

  //... get ready to append content for items found in json stream
  var htmlbuf = "";

  //now process the json stream:
  oboe(mystream)
  .node('{bar}', function(aBar){
    //eventually, I'd like to actually append individual new DOM elements,
    //but for now I'll settle for just spitting out raw html:
    htmlbuf += '<p>Found a bar with name' + aBar.name + '</p>';
  })
  .on('fail', function (err) {
    res.statusCode = err.statusCode
    next(err.thrown)
  })
  .on('done', function () {
    res.render('index', {itemsfound: htmlbuf});
  });
});

Answer 2

好吧，我试试。

如果您希望呈现带有计算内容的页面，那么

// js
app.get('/foo', function (req, res) {
    res.locals.var1 = 'Res.locals.var1'; // you can define vars here too

    if (!req.xhr)
        // send as html-page
        res.render('page.jade', {bar: smth-content, title: 'Hello world'}); // without var1
    else
        // send as json on ajax-request
        res.json({bar: smth-content, title: 'Hello world'}); 
});

// .jade
doctype html
html
  head
    link(type='text/css', rel='stylesheet', href='./css/main.css')
    |     
    title #{title} 
  body
    h1 Hello world!
    |   
    #{bar} #{var1}

要混合模板代码，您可以使用extends和include玉石关键字。或者这个技巧(不推荐)

// js
app.get('/foo', function (req, res) {
    res.render('row.jade', {myblock: smth-content}, function(err, html) {
        if (err)
            return res.send(err.message);
        res.render('page.jade', {myblock: html});
    }); 
});

// page.jade
doctype html
html
  head
    link(type='text/css', rel='stylesheet', href='./css/main.css')
  body
    #{myblock} 

// myblock.jade
p Found a bar with name #{myblock}