Import functions from another js file Javascript

Question

I have a question about including a file in javascript   I have a very simple example    -- gt  index html -- gt  models       -- gt  course js       -- gt  student js   course js   function Course         this id           this name           A student has a course property  like this   import    course    function Student         this firstName           this lastName           this course   new Course        and the index html is like     lt html gt       lt head gt           lt script src    models student js  type  text javascript  gt  lt  script gt       lt  head gt       lt body gt           lt div id  myDiv  gt           lt  div gt           lt script gt          window onload  function                 var x   new Student                x course id   1              document getElementById  myDiv   innerHTML   x course id                     lt  script gt       lt  body gt   lt  html gt    But I am getting an error on the line  var x   new Student           Student is not defined   When I remove the import from Student  I don t receive the error anymore  I have tried to use  require  import  include  create a custom function  export  and none has worked for me   Anybody knows why  and how to fix that   P S  the path is correct  it comes from the autocomplete in VS Code

User · Accepted Answer

The following works for me in Firefox and Chrome. In Firefox it even works from file:///

models/course.js

export function Course() {
    this.id = '';
    this.name = '';
};

models/student.js

import { Course } from './course.js';

export function Student() {
    this.firstName = '';
    this.lastName = '';
    this.course = new Course();
};

index.html

<div id="myDiv">
</div>
<script type="module">
    import { Student } from './models/student.js';

    window.onload = function () {
        var x = new Student();
        x.course.id = 1;
        document.getElementById('myDiv').innerHTML = x.course.id;
    }
</script>

User · Answer

In module js add below code  export function multiply         return 2   3         Consume the module in calc js  import   multiply   from    modules js    const result   multiply     console log  Result    result          Module html   lt  DOCTYPE html gt   lt html gt   lt head gt       lt meta charset  UTF-8  gt       lt meta name  viewport  content  width device-width  initial-scale 1 0  gt       lt meta http-equiv  X-UA-Compatible  content  ie edge  gt       lt title gt Module lt  title gt   lt  head gt   lt body gt      lt script type  module  src    calc js  gt  lt  script gt   lt  body gt   lt  html gt    Its a design pattern same code can be found below  please use a live server to test it else you will get CORS error  https   github com rohan12patil JSDesignPatterns tree master Structural 20Patterns module

User · Answer

You can try as follows     ------ js functions js ------ export function square x        return x   x    export function diag x  y        return sqrt square x    square y         ------ js main js ------ import   square  diag   from    functions js   console log square 11       121 console log diag 4  3       5   You can also import completely     ------ js main js ------ import   as lib from    functions js   console log lib square 11       121 console log lib diag 4  3       5   Normally we use   fileName js for importing own js file module and fileName js is used for importing package library module  When you will include the main js file to your webpage you must set the type  module  attribute as follows    lt script type  module  src  js main js  gt  lt  script gt    For more details please check ES6 modules

User · Answer

From a quick glance on MDN I think you may need to include the  js at the end of your file name so the import would read import    course js  instead of import    course   Ref  https   developer mozilla org en-US docs Web JavaScript Reference Statements import

User · Answer

By default  scripts can t handle imports like that directly  You re probably getting another error about not being able to get Course or not doing the import   If you add type  module  to your  lt script gt  tag  and change the import to   course js  because browsers won t auto-append the  js portion   then the browser will pull down course for you and it ll probably work   import    course js    function Student         this firstName           this lastName           this course   new Course           lt html gt       lt head gt           lt script src    models student js  type  module  gt  lt  script gt       lt  head gt       lt body gt           lt div id  myDiv  gt           lt  div gt           lt script gt          window onload  function                 var x   new Student                x course id   1              document getElementById  myDiv   innerHTML   x course id                     lt  script gt       lt  body gt   lt  html gt      If you re serving files over file     it likely won t work  Some IDEs have a way to run a quick sever   You can also write a quick express server to serve your files  install Node if you don t have it      package json      scripts      start    node server        dependencies      express    latest          server index js const express   require  express    const app   express     app use      express static  PATH TO YOUR FILES HERE    app listen 8000     With those two files  run npm install  then npm start and you ll have a server running over http   localhost 8000 which should point to your files

[javascript] Import functions from another js file. Javascript

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