browser - How to get simple Webpack bundle up and running using webpack-dev-server -


i scratching surface of building development environment webpack, webpack-dev-server, , hot module reloading. want able add react components static site (so seo benefit of having crawlable html. i've decided not use gulp or grunt, instead i'll solely use npm scripts run shell commands development, testing, building, , publishing.

returning title/topic of question. have not been able browsers read bundle.js file generated webpack. i've boiled library down simplest index.html , index.js can see below.

the error output console is:

uncaught referenceerror: handleclick not defined @ htmlbuttonelement.onclick ((index):7)

the emitted bundle.js file must error is:

/******/ (function(modules) { // webpackbootstrap /******/    // module cache /******/    var installedmodules = {}; /******/ /******/    // require function /******/    function __webpack_require__(moduleid) { /******/ /******/        // check if module in cache /******/        if(installedmodules[moduleid]) { /******/            return installedmodules[moduleid].exports; /******/        } /******/        // create new module (and put cache) /******/        var module = installedmodules[moduleid] = { /******/            i: moduleid, /******/            l: false, /******/            exports: {} /******/        }; /******/ /******/        // execute module function /******/        modules[moduleid].call(module.exports, module, module.exports, __webpack_require__); /******/ /******/        // flag module loaded /******/        module.l = true; /******/ /******/        // return exports of module /******/        return module.exports; /******/    } /******/ /******/ /******/    // expose modules object (__webpack_modules__) /******/    __webpack_require__.m = modules; /******/ /******/    // expose module cache /******/    __webpack_require__.c = installedmodules; /******/ /******/    // define getter function harmony exports /******/    __webpack_require__.d = function(exports, name, getter) { /******/        if(!__webpack_require__.o(exports, name)) { /******/            object.defineproperty(exports, name, { /******/                configurable: false, /******/                enumerable: true, /******/                get: getter /******/            }); /******/        } /******/    }; /******/ /******/    // getdefaultexport function compatibility non-harmony modules /******/    __webpack_require__.n = function(module) { /******/        var getter = module && module.__esmodule ? /******/            function getdefault() { return module['default']; } : /******/            function getmoduleexports() { return module; }; /******/        __webpack_require__.d(getter, 'a', getter); /******/        return getter; /******/    }; /******/ /******/    // object.prototype.hasownproperty.call /******/    __webpack_require__.o = function(object, property) { return object.prototype.hasownproperty.call(object, property); }; /******/ /******/    // __webpack_public_path__ /******/    __webpack_require__.p = ""; /******/ /******/    // load entry module , return exports /******/    return __webpack_require__(__webpack_require__.s = 0); /******/ }) /************************************************************************/ /******/ ([ /* 0 */ /***/ (function(module, exports) {  const handleclick = () => {   document.getelementbyid("demo").innerhtml = "hello world!"; };  /***/ }) /******/ ]);

my index.html file:

<html> <body>  <p id="demo">simple js demo</p>  <script src="bundle.js"></script> <button type="button" onclick='handleclick()'>click me!</button>  </body> </html>

my index.js file:

const handleclick = () => {   document.getelementbyid("demo").innerhtml = "hello world!" }

my webpack.config.js file:

const config = {   entry: './src/index.js',   output: {     filename: 'bundle.js',     path: '/home/andrew/code/my-site/public',   },   module: {     rules: [       {         test: /\.(js)$/,         exclude: /(node_modules)/,         use: {           loader: 'babel-loader',         }       }     ]   } };  module.exports = config;

my npm start script:

  "scripts": {     "start": "webpack-dev-server --content-base public/"   }

i have webpack installed globally can generate bundle.js file in public/ folder command webpack, though npm start emits bundle.js file anyways.

there's got simple error i'm making.

solution via @marek takac: error here scope of handleclick() function not global. can remedied exporting module within index.js file

module.exports = {   handleclick: handleclick }

and using webpack's output.library , output.librarytarget options define global variable.

see webpack's exports-loader

you're webpack bundle seems ok. problem in code. handleclick function undefined because calling global environment. try call window.hanldeclick defined handleclick function in totally different scope. webpack puts function separate closure prevent polluting global environment. suggest go through webpack / react tutorials, guides , documentation. if want test setup works correctly logging out console index.js file. alternatively think code should work if change const handleclick window.handleclick (although never tried this).


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more