I am new to Vue.js and have never used a frontend framework before.
I created a project using the "vue create" command with the usual plugins and everything (nothing game changing), and everything worked fine.
I wanted to start from 0, so I removed everything but the index.html file in the public directory, the main.js file in the src directory and the configuration files(see below).
Now when I load the page you can see "Test" and "{{message}}" for an instant and then it disappears leaving the page completely blank.
So my question is, how is the main.js file connected to the index.html file. I know from webpack that you need an entry point and link everything from there, but i cannot find such thing here, as main.js doesn't include index.html. So why doesn't my code work as intended? I want it to say Hello World.
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<link rel="icon" href="<%= BASE_URL %>favicon.ico" />
<title>Vue Getting Started</title>
</head>
<body>
<noscript>
<strong>
We're sorry but vue_getting_started doesn't work properly without
JavaScript enabled. Please enable it to continue.
</strong>
</noscript>
<div id="app">
<h1>Test</h1>
<h1>{{ message }}</h1>
</div>
<!-- built files will be auto injected -->
</body>
</html>
main.js
import Vue from 'vue'
const app = new Vue({
el: '#app',
data: {
message: 'Hello World!'
}
})
Where you see the line
<!-- built files will be auto injected -->
is where webpack will inject a script tag that loads the bundled javascript, you should be able to see that when you use the devtools. This is where your main entry chunk is being loaded. However, this only happens if webpack is actually doing its job either by running the dev server or by creating a production bundle.
If by "when I load the page" you mean opening up the index.html file in your browser, this won't do much. You will need to run webpack, in the newer versions of the vue cli you can do that by navigating to the root folder and running vue-cli-service serve
Related
Below is my reproduce step:
npm install vue#2.x.x
write below code in my main.js file
import Vue from 'vue' new Vue({
el: '#app',
data: {
msg: 'hello,word'
} })
use webpack build it, then it will build a file in dist folder
then I write index.html file
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div>
<div><span id="app">{{ msg }}</span></div>
</div>
<script src="./dist/main.js"></script>
</body>
</html>
then I open the index.html file in chrome, but it not display 'hello, word', I am a new beginner vue, I can not figure out what it wrong. thanks in advance.
And I alse found that vue delete my dom like above img.
At first, I thought it was because you weren't running the project properly but then I realized that the comment you've pointed to with the red arrow shows that the Webpack server is in fact running.
The problem you're having here it seems, is that you're using the runtime-only build of Vue when you need the runtime + compiler build to compile Vue components that have template blocks or swap the template blocks for render functions.
If you don't use the version with the compiler but your components have template blocks, then they won't compile properly (although normally an error is shown to advise of this).
For instructions on using the full build rather than the runtime-only version, see here.
I am getting this error
TypeError: Cannot read properties of undefined (reading 'UDFCompatibleDatafeed')
Import these two script in index.html /public folder
<script src="%PUBLIC_URL%/datafeeds/udf/dist/polyfills.js"></script>
<script src="%PUBLIC_URL%/datafeeds/udf/dist/bundle.js"></script>
i deleted my project and cloned their project and then i followed those mention steps then its run
i figured out the problem later
so in our on project i we missed two script in index.html then it will give this error on running so clone the project and then follow the mention step for your specific framework or library
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="%PUBLIC_URL%/datafeeds/udf/dist/polyfills.js"></script>
<script src="%PUBLIC_URL%/datafeeds/udf/dist/bundle.js"></script>
<title>Charting Library React Demo</title>
</head>
<body>
<noscript>
You need to enable JavaScript to run this app.
</noscript>
<div id="root"></div>
<!--
This HTML file is a template.
If you open it directly in the browser, you will see an empty page.
You can add webfonts, meta tags, or analytics to this file.
The build step will place the bundled scripts into the <body> tag.
To begin the development, run `npm start`.
To create a production bundle, use `npm run build`.
-->
</body>
</html>
None of the resources I've read about Vue attempt to explain how a Vue application is launched.
There are three files involved: public/index.html, src/main.js, and src/App.vue. A scaffold created with vue cli 4.1.1 contains this index.html which apparently is the entry point:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<link rel="icon" href="<%= BASE_URL %>favicon.ico">
<title>sample-vue-project</title>
</head>
<body>
<noscript>
<strong>We're sorry but sample-vue-project doesn't work properly without JavaScript enabled. Please enable it to continue.</strong>
</noscript>
<div id="app"></div>
<!-- built files will be auto injected -->
</body>
</html>
The main.js file creates the Vue App itself, but the index.html doesn't load main.js. If I double click on index.html I get a blank page, so something else has to intervene to launch the App. The comment in index.html says that files will be auto injected, but what does that injection?
Is the Vue launch process documented somewhere?
The Vue Cli handles the injection when you are developing locally as your run command will be something like npm run serve for default configurations.
When you get round to putting the code into production you'll end up running a different command npm run build which will create a new set of files where the index.html file will include a script tag that references all your javascript code. Under the hood it uses webpack to do all the asset linking.
See the Vue Cli website for more details.
I have started to build a demo project after learning React from some online tutorials.
Please consider the line of code below from a ReactComponent.
ReactDOM.render(<Home/>, document.getElementById('container'));
This renders the React component Home at the target DOM element container. All the tutorials online showed that this renders it in some index.html file. How does the code know, in which HTML(document) file to find the DOM element container. Below is the screenshot of the error I am getting.
Below is my index.html which is the default one from scaffolding.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="theme-color" content="#000000">
<!--
manifest.json provides metadata used when your web app is added to the
homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/
-->
<link rel="manifest" href="%PUBLIC_URL%/manifest.json">
<link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
<!--
Notice the use of %PUBLIC_URL% in the tags above.
It will be replaced with the URL of the `public` folder during the build.
Only files inside the `public` folder can be referenced from the HTML.
Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
work correctly both with client-side routing and a non-root public URL.
Learn how to configure a non-root public URL by running `npm run build`.
-->
<title>React App</title>
</head>
<body>
<noscript>
You need to enable JavaScript to run this app.
</noscript>
<div id="root"></div>
<!--
This HTML file is a template.
If you open it directly in the browser, you will see an empty page.
You can add webfonts, meta tags, or analytics to this file.
The build step will place the bundled scripts into the <body> tag.
To begin the development, run `npm start` or `yarn start`.
To create a production bundle, use `npm run build` or `yarn build`.
-->
</body>
</html>
With React, as all JavaScript, it's loaded into the file via an HTML file (i.e., the HTML file comes first). Your JavaScript is usually imported with a <script> tag. It's that HTML file currently open in the browser that it should look in.
So, you should have something like this for your HTML file, which you open in the browser:
<!DOCTYPE html>
<head>
<script src="./src/Home.js"></script>
<body>
<div id="container"></div>
Opening that, assuming the JS path is correct, should work fine.
I'm testing React-boilerplate and I'm trying to load some javascript files in the app/index.html file:
<!doctype html>
<html lang="en">
<head>
<!-- The first thing in any HTML file should be the charset -->
<meta charset="utf-8">
<!-- Make the page mobile compatible -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Allow installing the app to the homescreen -->
<link rel="manifest" href="manifest.json">
<meta name="mobile-web-app-capable" content="yes">
<script type="text/javascript" src="myJScriptFile1.js"></script>
<script type="text/javascript" src="myJScriptFile2.js"></script>
</head>
<body>
<!-- Display a message if JS has been disabled on the browser. -->
<noscript>If you're seeing this message, that means <strong>JavaScript has been disabled on your browser</strong>, please <strong>enable JS</strong> to make this app work.</noscript>
<!-- The app hooks into this div -->
<div id="app"></div>
<!-- A lot of magic happens in this file. HtmlWebpackPlugin automatically includes all assets (e.g. bundle.js, main.css) with the correct HTML tags, which is why they are missing in this HTML file. Don't add any assets here! (Check out webpackconfig.js if you want to know more) -->
</body>
</html>
This is the default index.html file. I'm running it with npm or yarn and the server console shows me no error, but my browser console keeps telling me:
Uncaught SyntaxError: Unexpected token <
Just like this, there is no more error. These javascript files work fine because I'm using them into another React based project, and I'm calling them into the index.html file as well. The console prints that error per file. If I trace the error it leads me to the correspond .js file.
After almost a week searching the web I couldn't find a solution. So that's it, does anybody have any idea on how to solve this?
Well, I'm answering myself. I needed a little bit more of research in webpack. I achieve this through webpack:
installed npm i add-asset-html-webpack-plugin -D
then, in the webpack config file, under plugins I added:
new AddAssetHtmlPlugin({ filepath: require.resolve('./some-file') })
and that's it.