How to call javascript functions of external files from ejs template?

Question

I have this file to add a new Ship and the script to populate de fleet dropdown menu works fine:

new.ejs file:

<% include ../partials/header %>

<div class="container">
    <div class="row">
        <h1 style="text-align: center;">Create a new Ship</h1>
        <div style="width: 30%; margin: 25px auto;">
            <form action="/ships" method="POST">
                <div class="form-group">
                    <input class="form-control" type="text" name="name" placeholder="name">
                </div>
                <div class="form-group">
                    <input class="form-control" type="number" name="tons" placeholder="tons" min="0" step="1">
                </div>
                <div class="form-group">
                    <input class="form-control" type="text" name="image" placeholder="img url">
                </div>
                <!--<div class="form-group">-->
                <!--    <input class="form-control" type="text" name="fleet" placeholder="fleet">-->
                <!--</div>-->

                <div class="form-group">
                    <select class="form-control" type="text" name="fleet" id="selectNumber" placeholder="fleet">
                        <option>Choose a fleet</option>
                    </select>
                </div>

                <script>
                    var select = document.getElementById("selectNumber");
                    var options = ["First fleet", "Second fleet", "Metropolitan fleet", "Support fleet"];
                    for(var i = 0; i < options.length; i++) {
                        var opt = options[i];
                        var el = document.createElement("option");
                        el.textContent = opt;
                        el.value = opt;
                        select.appendChild(el);
                    }
                </script>




                <div class="form-group">
                    <input class="form-control" type="text" name="description" placeholder="description">
                </div>
                <div class="form-group">
                    <button class="btn btn-lg btn-primary btn-block">Submit!</button>
                </div>
            </form>
            <a href="/ships/">Back</a>
        </div>
    </div>

</div>


<% include ../partials/footer %>

I want to separate the "logic" from the view, so I need to create a file: ../public/js/jsscripts.js

and I guess inside the jsscripts.js

module.exports = {
  PopulateFleet: function () {
var select = document.getElementById("selectNumber");
                    var options = ["First fleet", "Second fleet", "Metropolitan fleet", "Support fleet"];
                    for(var i = 0; i < options.length; i++) {
                        var opt = options[i];
                        var el = document.createElement("option");
                        el.textContent = opt;
                        el.value = opt;
                        select.appendChild(el);
                    }

};

1) Do I need to require the file "jsscripts" from my app.js ? Something like:

jscripts= require ("./public/js/jscripts");

2) How to call the function "PopulateFleet" from the new.ejs file? something like??

<% PopulateFleet %>

or

<% jscripts.PopulateFleet %>

Folder structure

Fleet - public - js -> jsscripts.js

Fleet - views - ships -> - new.ejs

Answer 1

I have the same issue and I find a solution. So I know this solution is not the ideal solution but it's works.

I have a function's file "my_functions.js" with code like that :

var processSomething = function(variableXXXX)
{
    ...
    ...
    return(variableNew)
}

module.exports.processSomething     = processSomething;

I require this file into "application.js" like that :

var myFonctions = require('./include/my_fonctions.js');

And I pass this variable to my EJS like that

res.render('view.ejs',{myFonctionsForEjs:myFonctions});

And, in my EJS File I can do that

var response = myFonctionsForEjs.processSomething(1234);

Answer 2

use <%= jscripts.PopulateFleet() %>