问题
So I am trying to loop through an array of objects that I got from an http call using to my internal API using the request module/package. So far, I am able to get my data back from the API and DISPLAY the full object on my page. I would like to display it on my page and loop through it using the EJS templating system. I know I can use AngularJS for frontend stuff, but I would like to see how far I can go with only server-side.
So below is my code:
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
So if I simply output the entire reports object like this <p><%= reports %></p> on my page, everything works fine and I get something like this:
[
{
"_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"
]
}
]
But if I try to loop through the object as seen below It get an UNDEFINED as a return property of my report object and I get an infinite loop apparently.
<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>
I have tried another variation of the loop but I am still unsuccessful:
<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>
回答1:
The syntax for the for loop in ejs is perfect but the iterated array name is reports and you seem to use report[i] inside the iteration, which needs to be changed as reports[i], which should work.
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>
Hope this helps.
回答2:
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>
<%}%>
<%}%>
回答3:
Async is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript. Although originally designed for use with Node.js and installable via
npm install --save async
For Documentation, visit http://caolan.github.io/async/
Examples
// 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');
}
});
来源：https://stackoverflow.com/questions/38179077/what-is-the-proper-way-to-loop-through-an-array-in-an-ejs-template-after-an-ajax