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How do I load an external JS library in Svelte/Sapper?

By : msreddy
Date : September 17 2020, 08:00 AM
I think the issue was by ths following , The way to use an external library in Svelte is to import it. I don't know how easy it is to do that with Ace — code editors tend to be somewhat complex, with their own module systems for loading languages and themes etc — but in theory it would look something like this:
code :
  import ace from 'ace';
  import { onMount } from 'svelte';

  let div;
  let editor;

  onMount(() => {
    // we need to use onMount because the div hasn't
    // been created by the time the init code runs
    editor = ace.edit(div);

    return () => {
      // any cleanup code goes here

<div bind:this={div}> def main():
    return sum(range(1,100))

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I have some questions about Sapper/Svelte

By : Pooja Bhave
Date : March 29 2020, 07:55 AM
I wish this helpful for you Svelte will only iterate over array-like objects, because it's not possible to guarantee consistent behaviour with objects — it throws up various edge cases that are best solved at an app level. You can do this sort of thing, just using standard JavaScript idioms:
code :
{{#each Object.values(info.attributes) as attr}}
  <p>{{attr.description}} ...</p>

<!-- or, if you need the key as well -->
{{#each Object.entries(info.attributes) as [key, value]}}
  <p>{{attr.description}} ...</p>
preload({ params, query }) {
  return fetch(`/i18n/${locale}.json`)
    .then(r => r.json())
    .then(dict => {
      return { dict };
// app/client.js (assuming Sapper >= 0.7)
import COMPONENTS from './config/components.json';

// app/server.js
import COMPONENTS from './config/components.json';
{{#each Object.values(info.attributes) as attr}}
  <p>{{attr.description}} <input bind:value=organization_name /></p>

Lazy load images in (svelte/sapper)

By : Rram
Date : March 29 2020, 07:55 AM
it helps some times You're looking for actions. These are functions that run when an element is added to the DOM, and return an object with a destroy and (optional) update method.
You could do something like this (interactive demo here):
code :
  alt="random photo"
  use:lazy="{src: 'https://picsum.photos/400/200'}"

  img {
    width: 400px;
    height: 200px;

  const loaded = new Map();

  export default {
    actions: {
      lazy(node, data) {
        if (loaded.has(data.src)) {
          node.setAttribute('src', data.src);
        } else {
          // simulate slow loading network
          setTimeout(() => {
            const img = new Image();
            img.src = data.src;
            img.onload = () => {
              loaded.set(data.src, img);
              node.setAttribute('src', data.src);
          }, 2000);

        return {
          destroy(){} // noop

Sapper and Svelte scroller example

By : jasmit
Date : March 29 2020, 07:55 AM
hop of those help? Yes, there is. We'll update the template soon but in the meantime you can get it working by following the steps in this issue:
Add a resolve.mainFields: ['svelte', 'module', 'browser', 'main'] option to both client and server configs Remove the exclude option from the svelte-loader config, so that the external component gets resolved Modify the externals option in the server config so that the external component is bundled (i.e. processed by the compiler), rather than the (client-side) pre-compiled version being imported at runtime

How should I use cookies with Svelte and Sapper?

By : Foob
Date : March 29 2020, 07:55 AM
it helps some times I found two ways to solve this:
1. Access cookies inside of functions that will only be executed client-side at runtime
code :
async function myRuntimeAction() {
   const myCookieValue = getCookie("myCookie");
   let res = fetch(`https://www.example.com/api/${myCookieValue}`);
if (process.browser) {
    const myCookieValue = getCookie("myCookie");

How can I run a Svelte/Sapper app over HTTPS/SSL?

By : user3604319
Date : March 29 2020, 07:55 AM
I hope this helps . It seems the only way to do it as of now is to run a reverse proxy (like nginx) in front of the Svelte/Sapper app.
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