因此,我尝试使用request
模块/包将我从http调用使用的对象数组循环到我的内部API。到目前为止,我能够从API获取数据并在我的页面上显示完整对象。我想在我的页面上显示它并使用EJS模板系统循环它。我知道我可以使用AngularJS作为前端的东西,但我想看看我能在多大程度上只用服务器端。
以下是我的代码:
server.js
// Prepend /api to my apiRoutes
app.use('/api', require('./app/api'));
api.js
var Report = require('./models/report');
var express = require('express');
var apiRoutes = express.Router();
apiRoutes.route('/reports', isLoggedIn)
.get(function (req, res,next) {
// use mongoose to get all reports in the database
Report.find(function (err, reports) {
// if there is an error retrieving, send the error.
// nothing after res.send(err) will execute
if (err)
return res.send(err);
res.json(reports);
});
});
routes.js
var User = require('./models/user');
var request = require('request');
module.exports = function (app, passport) {
app.get('/reports', isLoggedIn, function (req, res) {
res.render('pages/new-report.ejs', {
user: req.user,
title:'New Report'
});
});
request({
uri:'http://localhost:2016/api/reports',
method:'GET'
}).on('data',function(data){
console.log('decoded chunk:' + data)
}).on('response',function(resp){
resp.on('data', function(data){
console.log('received:' + data.length + ' bytes of compressed data');
app.get('/timeline', isLoggedIn, function (req, res) {
res.render('pages/timeline', {
user: req.user,
title:'Timeline',
reports: data
});
});
})
});
}
reports.ejs
因此,如果我只是在我的页面上输出整个reports
对象,就像这个<p><%= reports %></p>
一样,一切正常,我会得到这样的结果:
[
{
"_id": "5775d396077082280df0fbb1",
"author": "57582911a2761f9c77f15528",
"dateTime": "30 June 2016 - 07:18 PM",
"picture": "",
"description": "",
"location": [
-122.46596999999997,
37.784495
],
"latitude": 37.784495,
"longitude": -122.46596999999997,
"address": "4529 California St, San Francisco, CA 94118, USA",
"contact": "John Doe",
"type": "Financial",
"__v": 0,
"updated_at": "2016-07-01T02:21:10.259Z",
"created_at": "2016-07-01T02:21:10.237Z",
"tags": [
"tag1,tag2"
]
}
]
但是,如果我尝试循环遍历对象,如下所示它得到 UNDEFINED 作为我的报告对象的返回属性,我显然得到了一个无限循环。
<ul class="timeline">
<% reports.forEach(function(report) { %>
<li class="timeline-yellow">
<div class="timeline-time">
<span class="date" style="text-align:left">
<%= report.type %> </span>
<span class="time" style="font-weight:700;font-size:25px;line-height:20px;text-align:left;">
<%= report.dateTime %> </span>
</div>
</li>
<% }) %>
</ul>
我尝试过循环的另一种变体,但我仍然没有成功:
<ul class="timeline">
<% for (var i = 0; i < reports.length; i++) { %>
<li class="timeline-yellow">
<div class="timeline-time">
<span class="date" style="text-align:left">
<%= report[i].type %>
4/10/13 </span>
<span class="time" style="font-weight:700;font-size:25px;line-height:20px;text-align:left;">
<%= report[i].dateTime %> </span>
</div>
</li>
<% } %>
</ul>
答案 0 :(得分:10)
for
中ejs
循环的语法是完美的,但迭代的数组名称是报告,您似乎使用 report [i] 迭代内部,需要更改为 reports [i] ,这应该有效。
reports.ejs
<ul class="timeline">
<% for (var i = 0; i < reports.length; i++) { %>
<li class="timeline-yellow">
<div class="timeline-time">
<span class="date" style="text-align:left">
<%= reports[i].type %>
4/10/13 </span>
<span class="time" style="font-weight:700;font-size:25px;line-height:20px;text-align:left;">
<%= reports[i].dateTime %> </span>
</div>
</li>
<% } %>
</ul>
希望这有帮助。
答案 1 :(得分:0)
I guess something like this ..
<% if (reports.length > 0){%> // Checking if there are reports
<ul class="timeline">
<% for (let report of reports){ %>
<li class="timeline-yellow">
<div class="timeline-time">
<span class="date" style="text-align:left">
<%= report.type %>
4/10/13 </span>
<span class="time" style="font-weight:700;font-size:25px;line-
height:20px;text-align:left;">
<%= report.dateTime %> </span>
</div>
</li>
<% } %>
</ul>
<%}%>
<%}%>
答案 2 :(得分:0)
这是我使用 loopback3 和 ejs 的工作版本:
在 server/boot/routes.js 中:
module.exports = function(app) {
const router = app.loopback.Router();
router.get('/', function(req, res){
app.models.ZenGarden.find()
.then(plants => {
console.log('plants: ', plants)
res.render('index', {plants:plants})
}).catch(err => {
console.log('Failed to find in ZenGarden: ', err)
res.render('index')
})
});
router.post('/', function(req, res){
var plants = req.body.plants;
if (plants) {
for (var i = 0; i < plants.length; i++) {
console.log(plants[i])
app.models.ZenGarden.upsert(plants[i])
.then().catch(err => console.log(err))
}
}
return res.render('index', {plants:plants})
})
app.use(router);
};
在 server/views/index.ejs 中:
<div>
<form action='/' method='POST'>
<% if (plants) { %>
<table>
<tr><td>Name</td><td>Count</td></tr>
<% for (var i = 0; i < plants.length; i++) { %>
<tr>
<input type='hidden' value=<%= plants[i].id %> name='plants[<%= i %>][id]'>
<input type='hidden' value="<%= plants[i].name %>" name='plants[<%= i %>][name]'>
<td><%= plants[i].name %></td>
<td><input type='text' value=<%= plants[i].count %> name='plants[<%= i%>][count]'</td></tr>
<% } %>
</table>
<button type='submit'>Save</button>
<% } else { %>
<p>No plant in Zen Garden :-(</p>
<% } %>
</form>
</div>
确保在 server/server.js 中添加以下内容:
const path = require('path')
const bodyparser = require('body-parser')
app.set('view engine', 'ejs')
app.set('views', path.resolve(__dirname, 'views'))
app.middleware('initial', bodyparser.urlencoded({extended:true}))
app.middleware('initial', bodyparser.json())
这里是模型 ZenGarden(common/models/zen-garden.json) 的定义:
{
"name": "ZenGarden",
"base": "PersistedModel",
"idInjection": true,
"options": {
"validateUpsert": true
},
"properties": {
"name": {
"type": "string",
"required": true
},
"count": {
"type": "number",
"required": true
}
},
"validations": [],
"relations": {},
"acls": [],
"methods": {}
}
答案 3 :(得分:-1)
Async是一个实用程序模块,它提供了使用异步JavaScript的直接,强大的功能。虽然最初设计用于Node.js并可通过
安装 npm install --save async
有关文档,请访问http://caolan.github.io/async/
<强>实施例强>
// assuming openFiles is an array of file names and saveFile is a function
// to save the modified contents of that file:
async.each(openFiles, saveFile, function(err){
// if any of the saves produced an error, err would equal that error
});
// assuming openFiles is an array of file names
async.each(openFiles, function(file, callback) {
// Perform operation on file here.
console.log('Processing file ' + file);
if( file.length > 32 ) {
console.log('This file name is too long');
callback('File name too long');
} else {
// Do work to process file here
console.log('File processed');
callback();
}
}, function(err){
// if any of the file processing produced an error, err would equal that error
if( err ) {
// One of the iterations produced an error.
// All processing will now stop.
console.log('A file failed to process');
} else {
console.log('All files have been processed successfully');
}
});