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Thursday, September 8, 2022

[FIXED] What is the proper way to loop through an array in an EJS template after an AJAX Call (using ExpressJS)?

 September 08, 2022     ajax, ejs, express, node.js, requestjs     No comments   

Issue

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.

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>

Solution

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.



Answered By - SUNDARRAJAN K
Answer Checked By - Terry (PHPFixing Volunteer)
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