I want to use PouchDB with SvelteKit. I have copied pouchdb-7.2.1.js to /src/libd in SvelteKit and renamed it to pouchdb.js. Pouchdb should run in the browser. Therefore I have used ssr=false to suppress server side rendering. I get the first error at the import statement. This is my first very short page (couchdb.svelte):
<script context="module">
export const ssr = false;
</script>
<script>
import PouchDB from '$lib/pouchdb.js';
</script>
I get an error 500
import not found: PouchDB
I have tried a lot of diffent version without any success. For example:
import PouchDB from 'pouchdb-browser'; (After npm i pouchdb-browser)
import PouchDB from 'pouchdb'; (After npm i pouchdb)
What is the correct way to use pouchdb?
Here is a work-around that uses PouchDB via a script tag:
index.svelte:
<script>
import { onMount } from 'svelte'
// Ensure execution only on the browser, after the pouchdb script has loaded.
onMount(async function() {
var db = new PouchDB('my_database');
console.log({PouchDB})
console.log({db})
});
</script>
<svelte:head>
<script src="//cdn.jsdelivr.net/npm/pouchdb#7.2.1/dist/pouchdb.min.js"></script>
</svelte:head>
When imported, PouchDB seems to expect a certain environment that Svelte/Vite/Rollup does not provide. (Svelte/Vite is happiest with proper ESM modules; PouchDB seems to be a "window.global" script that was converted to a JS module.)
There may be a way to modify the configuration to create the environment expected by PouchDB. I think you would have to modify the svelte.config.cjs file. (Specifically the vite section that determines the rollup configuration.)
You might find some hints in this related issue for PouchDB + Angular.
I would just use the <script> work-around above.
For future googlers trying to integrate pouchdb-browser and/or RxDB with sveltekit here are the changes to "fix" the enviornment for pouchdb in the browser when using vite.
Add to your <head> section before %svelte.head%
<script>
window.process = window.process || {env: {NODE_DEBUG:undefined, DEBUG:undefined}};
window.global = window;
</script>
In svelte.config.js add the optimizeDeps to config.kit.vite.optimizeDeps
optimizeDeps: {
allowNodeBuiltins: ['pouchdb-browser', 'pouchdb-utils', 'base64id', 'mime-types']
}
Here is a commit that makes these changes to my app:
https://github.com/TechplexEngineer/bionic-scouting/commit/d1c4a4dcdc7096ae40937501d97a7ef9ee10ab66
Thanks to:
pouchdb/pouchdb#8266 (comment)
I have been battling this very same problem for a while. I decided to go a different route. This may not be right, but it is working.
I added two scripts to my app.html head:
<head>
<meta charset="utf-8" />
<meta name="description" content="" />
<link rel="icon" href="%svelte.assets%/favicon.png" />
<meta name="viewport" content="width=device-width, initial-
scale=1" />
<!-- Call the Pouchdb import -->
<script type="text/javascript" src="../src/lib/pouchdb.js">
</script>
<!-- create new databases for use in the app -->
<script>
const user = new PouchDB('user');
</script>
%svelte.head%
</head>
Then in any component that I want to use the database, I add an additional script tag to define the variable "user":
<script lang="ts" context="module">
//Declare the database name so that it is recognized.
declare const user;
</script>
<script lang="ts">
//Example use of database.
const addUser = () => {
//Call the database by name established in app.html
user.put({
_id: 'someid',
firstName: 'Jon',
lastName: 'doe'
});
};
</script>
That has been the easiest method for me to employ PouchDB with SvelteKit. Every other solution required significant modifications to configuration files, changes to environment variables, and unnecessary adaptations of code throughout the application. I hope this helps.
Related
I'm attempting to put my first full-stack application together and am getting an unexpected syntax error:
"Uncaught SyntaxError: Unexpected token {"
The error is coming from this line of code in my map.js file:
import {userInput} from './algorithm/searchingAlgorithm.js';
ejs file:
<head>
<script type="text/javascript" src="../javascripts/map.js"></script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCx0LvEwPUgGhpLjCErr24dOnk-VWjo83g&callback=initMap">
</script>
<link rel='stylesheet' href='/stylesheets/style.css' />
</head>
from './algorithm/searchingAlgorithm.js':
export default async function userInput(origin, destination){
I've done a lot of searching and have yet to come up with an answer. I'm using node.js/express and express generator, javascript. I'm also utilizing the google maps api.
The import and export statements are used frequently in web development, but they do not currently work automatically in a browser because they are newer features in the JavaScript language. You need to "build" the code into a format that the browser can execute. Example code on the web tends to assume that you are already doing this.
There are different tools that allow you to do this, such as Rollup or Webpack.
Heads up for anyone running into this issue like I was.
TLDR; make sure to run the import statement from GLOBAL SCOPE.
I ended up trying to insert my first import {test_exported_function} from "./test.js";
from inside of my main function which waits for the DOM content to load before running all of my scripts.
Didn't realize that I needed to execute that line from global scope of the script.
Once I realized that, it suddenly hit me how dumb I was for trying to import from a function scope.
(ﾉ≧ڡ≦) Teehee~!
I would like to add a custom view to jhipster app on index.html
I already created the link in navbar.html and added the html file on path src/main/webapp/scripts/app/custom/newView.html
<a ui-sref="newView" data-toggle="collapse" data-target=".navbar-collapse.in">
<span class="glyphicon"></span>
<span class="hidden-sm">new view</span>
</a>
When I click on the link it doesn't work. Probably it needs a custom route in angular but I can't figure out how to create it. What else should I do?
In addition to the other answer, here is another piece of information. Maybe somebody else will find it useful. I had a similar problem with a custom view but only in production. Everything was fine in dev mode. In production mode, nothing would display and I had this javascript error that read "could not resolve ... from state ...".
It turns out that my javascript file (where the state was declared) was declared like this in index.html
<!-- build:js({.tmp,src/main/webapp}) scripts/app.js -->
<script src="scripts/app/app.js"></script>
<script src="scripts/app/app.constants.js"></script>
...
<!-- endbuild -->
<!-- custom -->
<script src="scripts/app/pages/quizz/quizz.js"></script>
<script src="scripts/app/pages/quizz/quizz.controller.js"></script>
I had created the separation on purpose, just to make it easier to read. Once I moved it up to have it before endbuild, the problem disappeared. I guess this is related to how the app is packaged somehow? I haven't looked at how it does it.
I've figured it out:
I had to add a angularjs route. Created a js file
src/main/webapp/scripts/app/custom/newv.js with the following content:
angular.module('jCrudApp')
.config(function ($stateProvider) {
$stateProvider
.state('newView', {
parent: 'site',
url: '/newView',
views: {
'content#': {
templateUrl: 'scripts/app/custom/newView.html',
//controller: 'MainController'
}
}
});
});
and import the new script in index.html
<script src="scripts/app/custom/newv.js"></script>
I started using JSPM with atom/electron for porting a web site I've built using Marionette.
I have all my App written around Marionette modules so I want to load all the JavasSript files before starting the app.
<script src="jspm_packages/system.js"></script>
<script src="config.js"></script>
<script>
loadApp = System.import('./scripts/app_definition').then(function(m){
window.App = m['App'];
});
</script>
<!-- inject:js -->
##LOTS INJECTED SCRIPTS THAT NEEDS window.App to be defined##
<script src="compiled/modules/video/video_app.js"></script>
<!-- endinject -->
<script type="text/javascript">
loadApp.then(function(){
App.start();
})
</script>
I'm having problems with the Async nature of System.import(). How would you load the scripts after System.import has finished loading the App code?
For production I have no problem with this, because I would concatenate all the files in a single js module and the load that module using System.import, but that would be a nightmare to debug, I would prefer to have the files loaded separately.
Any thoughts? Thanks!
Global variables are a big no no when using ES6 modules.
You could load your scripts after the app definition:
loadApp = System.import('./scripts/app_definition').then(function(m){
window.App = m['App'];
var scriptEl = document.createElement('script');
scriptEl.src = "compiled/modules/video/video_app.js";
document.head.appendChild(scriptEl);
});
But i'm not sure what's the use of having JSPM here in the first place. So the real solution would be to transform all your modules to ES6 import syntax and avoid global variables all together.
I am a jQuery user and just learning YUI. I have the following code and I keep the error that YUI is not defined. I know it is an issue with linking to the library but I'm not exactly sure what. I had someone else test my code where they had YUI held locally and it worked fine. If I need to do this, how do I obtain a copy of the min.js file? When you download a copy from the YUI site its a tonne of files...
<head>
<title>YUI3 Test</title
<script src="http://yui.yahooapis.com/3.2.0/build/yui/yui-min.js"></script>
</head>
<body>
<div id="menu">
<p>Click here to test.</p>
</div>
<script>
YUI().use('node', 'event', function (Y){
var changeText = function(e){
e.target.setHTML("<p>Now you see the test working.</p>");
}
var node = Y.one("#menu");
node.on("click", changeText);
//node.on("click", function(e){
// Y.one(node).load('menu.html');
//});
});
</script>
</body>
Thanks!
You're missing a > after </title. This may be causing the script tag not to be recognized and so it's not loading.
Here it is broken: http://jsbin.com/ubaxoy/1/edit
And here it works after adding the missing >: http://jsbin.com/ubaxoy/2/edit
I also had to change setHTML to setContent because YUI 3.2 didn't have setHTML yet. I'd also recommend you to use a newer version of YUI, from 3.9.1 up. There have been a number of great additions since 3.2.
In the tutorial for migrating a Google Chrome Extension to Manifest Version 2, I am directed to Remove inline event handlers (like onclick, etc) from the HTML code, move them into an external JS file and use addEventListener() instead.
OK, I currently have a background.html page that looks like this…
<html>
<script type="text/javascript">
// Lots of script code here, snipped
…
</script>
<body onload="checkInMyNPAPIPlugin('pluginId');">
<object type="application/x-mynpapiplugin" id="pluginId">
</body>
</html>
Following another directive, I've moved that Lots of script code into a separate .js file, and following this directive, I need to remove the onload= from the body tag, and instead cal addEventListener() in my script code. I've tried several approaches, but am apparently guessing wrong. What will that code look like? In particular, upon what object do I invoke addEventListener()?
Thanks!
I normally use this for body onload event...
document.addEventListener('DOMContentLoaded', function () {
// My code here.. ( Your code here )
});
For somethings it is working.. but really, I think we should use..
window.addEventListener('load', function () {
document.getElementById("#Our_DOM_Element").addEventListener('change - or - click..', function(){
// code..
});
});