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JavaScript Hello World Sample - NuxtJS

Nuxt is a higher-level framework that builds on top of Vue. Check out the following guide on how to implement Dynamsoft Barcode Reader JavaScript SDK (hereafter called “the library”) into a Nuxt application. Note that in this sample we will use TypeScript.

Official Sample

Preparation

Make sure you have node installed. node 14.21.3 and nuxt 3.2.3 are used in this article.

Create the sample project

Create a Bootstrapped Nuxt Application

npx nuxi@latest init read-video-nuxtjs

You will be asked to configure quite a few things for the application during the creation. In our example, we chose the default one in every step.

CD to the root directory of the application and install the dependencies

cd read-video-nuxtjs
npm install dynamsoft-javascript-barcode

Start to implement

Add a file “dbr.ts” at the root of the app to configure the library

import { BarcodeReader } from 'dynamsoft-javascript-barcode';
BarcodeReader.license = 'DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9';
BarcodeReader.engineResourcePath = "https://cdn.jsdelivr.net/npm/dynamsoft-javascript-barcode@9.6.42/dist/";

Note:

  • license specify a license key to use the library. You can visit https://www.dynamsoft.com/customer/license/trialLicense?utm_source=sample&product=dbr&package=js to get your own trial license good for 30 days.
  • engineResourcePath tells the library where to get the necessary resources at runtime.

Create a directory “components” and create the following files inside it to represent three components

  • VideoDecode.vue
  • ImgDecode.vue
  • HelloWorld.vue

Edit the VideoDecode component

  • Add a file VideoDecode.vue under “/components/” as the VideoDecode component. The VideoDecode component uses BarcodeScanner class of the library to help decode barcodes via camera.

  • In VideoDecode.vue, add code for initializing and destroying the BarcodeScanner instance.

<script setup lang="ts">
import { onBeforeUnmount, onMounted, ref, getCurrentInstance } from "vue";
import type { Ref } from 'vue'
import { BarcodeScanner } from 'dynamsoft-javascript-barcode'

const pScanner: Ref<null | Promise<BarcodeScanner>> = ref(null);
const elRefs: Ref<null | HTMLElement> = ref(null);
onMounted(async () => {
  try {
    const internalInstance = getCurrentInstance();
    elRefs.value = internalInstance?.refs.elRefs as HTMLElement;
    const scanner = await (pScanner.value = BarcodeScanner.createInstance());
    await scanner.setUIElement(elRefs.value);
    scanner.onFrameRead = (results) => {
      for (let result of results) {
        console.log(result.barcodeText);
      }
    };
    scanner.onUniqueRead = (txt) => {
      alert(txt);
    }
    await scanner.open();
  } catch (ex:any) {
    let errMsg = ex.message||ex;
    if (errMsg.includes("network connection error")) {
      errMsg = "Failed to connect to Dynamsoft License Server: network connection error. Check your Internet connection or contact Dynamsoft Support (support@dynamsoft.com) to acquire an offline license.";
    }
    console.error(errMsg);
    alert(errMsg);
  }
});
onBeforeUnmount(async () => {
  if (pScanner.value) {
    (await pScanner.value).destroyContext();
    console.log('BarcodeScanner Component Unmount');
  }
});
</script>

<template>
  <div ref="elRefs" class="component-barcode-scanner">
    <svg class="dce-bg-loading" viewBox="0 0 1792 1792">
      <path
        d="M1760 896q0 176-68.5 336t-184 275.5-275.5 184-336 68.5-336-68.5-275.5-184-184-275.5-68.5-336q0-213 97-398.5t265-305.5 374-151v228q-221 45-366.5 221t-145.5 406q0 130 51 248.5t136.5 204 204 136.5 248.5 51 248.5-51 204-136.5 136.5-204 51-248.5q0-230-145.5-406t-366.5-221v-228q206 31 374 151t265 305.5 97 398.5z"></path>
    </svg>
    <svg class="dce-bg-camera" viewBox="0 0 2048 1792">
      <path
        d="M1024 672q119 0 203.5 84.5t84.5 203.5-84.5 203.5-203.5 84.5-203.5-84.5-84.5-203.5 84.5-203.5 203.5-84.5zm704-416q106 0 181 75t75 181v896q0 106-75 181t-181 75h-1408q-106 0-181-75t-75-181v-896q0-106 75-181t181-75h224l51-136q19-49 69.5-84.5t103.5-35.5h512q53 0 103.5 35.5t69.5 84.5l51 136h224zm-704 1152q185 0 316.5-131.5t131.5-316.5-131.5-316.5-316.5-131.5-316.5 131.5-131.5 316.5 131.5 316.5 316.5 131.5z">
      </path>
    </svg>
    <div class="dce-video-container"></div>
    <div class="dce-scanarea">
      <div class="dce-scanlight"></div>
    </div>
    <div class="div-select-container">
      <select class="dce-sel-camera"></select>
      <select class="dce-sel-resolution"></select>
    </div>
    <div class="dbr-msg-poweredby">
      <svg viewBox="0 0 94 17">
        <g>
          <path
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          <path
            d="M84.7,14.1c-0.5,0-0.8-0.1-1.1-0.3c-0.3-0.2-0.5-0.5-0.6-0.9s-0.2-0.9-0.2-1.4V9.6c0-0.6,0.1-1,0.2-1.4 c0.1-0.4,0.3-0.7,0.6-0.9C83.9,7.1,84.3,7,84.7,7c0.5,0,0.9,0.1,1.1,0.3s0.5,0.5,0.6,0.9c0.1,0.4,0.2,0.9,0.2,1.4v1.9 c0,0.6-0.1,1-0.2,1.4s-0.3,0.7-0.6,0.9S85.2,14.1,84.7,14.1z M84.7,13.4c0.3,0,0.5-0.1,0.7-0.2c0.1-0.2,0.2-0.4,0.3-0.7 c0-0.3,0-0.6,0-1v-2c0-0.4,0-0.7,0-1c0-0.3-0.1-0.5-0.3-0.7c-0.1-0.2-0.4-0.2-0.7-0.2c-0.3,0-0.5,0.1-0.7,0.2 c-0.1,0.2-0.2,0.4-0.3,0.7c0,0.3-0.1,0.6-0.1,1v2c0,0.4,0,0.7,0.1,1c0,0.3,0.1,0.5,0.3,0.7C84.2,13.4,84.4,13.4,84.7,13.4z" />
          <path
            d="M88.2,14V7.7h-0.9V7.1h0.9V6.3c0-0.3,0-0.6,0.1-0.9c0.1-0.3,0.2-0.5,0.4-0.6c0.2-0.2,0.5-0.2,0.8-0.2 c0.1,0,0.2,0,0.4,0c0.1,0,0.2,0,0.3,0.1v0.6c-0.1,0-0.2,0-0.2,0c-0.1,0-0.2,0-0.2,0c-0.3,0-0.4,0.1-0.5,0.2s-0.1,0.4-0.1,0.8v0.8 h1.1v0.6h-1.1V14H88.2z" />
          <path
            d="M92.7,14.1c-0.3,0-0.6-0.1-0.8-0.2s-0.3-0.3-0.4-0.5c-0.1-0.2-0.1-0.5-0.1-0.8V7.6h-0.9V7.1h0.9V4.9h0.9v2.1 h1.2v0.6h-1.2v4.8c0,0.3,0,0.6,0.1,0.7c0.1,0.1,0.2,0.2,0.5,0.2c0.1,0,0.2,0,0.2,0s0.2,0,0.3,0V14c-0.1,0-0.2,0-0.4,0.1 C92.9,14.1,92.8,14.1,92.7,14.1z" />
        </g>
      </svg>
    </div>
  </div>
</template>

<style scoped>
.component-barcode-scanner {
  width: 100%;
  height: 100%;
  /* min-width: 640px; */
  min-height: 480px;
  background: #eee;
  position: relative;
  resize: both;
}

.dce-bg-loading {
  display: none;
  animation: 1s linear infinite dce-rotate;
  width: 40%;
  height: 40%;
  position: absolute;
  margin: auto;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  fill: #aaa;
}

.dce-bg-camera {
  display: none;
  width: 40%;
  height: 40%;
  position: absolute;
  margin: auto;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  fill: #aaa;
}

.dce-video-container {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}

.dce-scanarea {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
}

.dce-scanlight {
  display: none;
  width: 100%;
  height: 3%;
  position: absolute;
  animation: 3s infinite dce-scanlight;
  border-radius: 50%;
  box-shadow: 0px 0px 2vw 1px #00e5ff;
  background: #fff;
}

.div-select-container {
  position: absolute;
  left: 0;
  top: 0;
}

.dce-sel-camera {
  display: block;
}

.dce-sel-resolution {
  display: block;
  margin-top: 5px;
}

.dbr-msg-poweredby {
  position: absolute;
  left: 50%;
  bottom: 10%;
  transform: translateX(-50%);
}

.dbr-msg-poweredby svg {
  height: max(3vmin, 17px);
  fill: #ffffff;
}

@keyframes dce-rotate {
  from {
    transform: rotate(0turn);
  }

  to {
    transform: rotate(1turn);
  }
}

@keyframes dce-scanlight {
  from {
    top: 0;
  }

  to {
    top: 97%;
  }
}

@keyframes dbrScanner-scanlight {
  from {
    top: 0;
  }

  to {
    top: 97%;
  }
}
</style>

Note:

  • The element with class name “component-barcode-scanner” is used to build the UI for the library in this line

    await scanner.setUIElement(elRefs.value);
    
  • To release resources timely, the BarcodeScanner instance is destroyed with the component in the callback onBeforeUnmount .

Edit the ImgDecode component

  • Add a file ImgDecode.vue under “/components/” as the ImgDecode component. The ImgDecode component uses BarcodeReader class of the library to help decode barcodes in an image.

  • In ImgDecode.vue, add code for initializing and destroying the BarcodeReader instance.

<script setup lang="ts">
import { onBeforeUnmount, ref } from "vue";
import type { Ref } from 'vue'
import { BarcodeReader } from 'dynamsoft-javascript-barcode'

const pReader: Ref<null | Promise<BarcodeReader>> = ref(null);

const decodeImg = async (e:Event) => {
  try {
    const reader = await (pReader.value = pReader.value || BarcodeReader.createInstance());
    let results = await reader.decode((e.target as any).files[0]);
    for (let result of results) {
      alert(result.barcodeText);
    }
    if (!results.length) { alert('No barcode found'); }
  } catch (ex:any) {
    let errMsg = ex.message||ex;
    if (errMsg.includes("network connection error")) {
      errMsg = "Failed to connect to Dynamsoft License Server: network connection error. Check your Internet connection or contact Dynamsoft Support (support@dynamsoft.com) to acquire an offline license.";
    }
    console.error(errMsg);
    alert(errMsg);
  }
  (e.target as HTMLInputElement).value = '';
}
onBeforeUnmount(async () => {
  if (pReader.value) {
    (await pReader.value).destroyContext();
    console.log('ImgDecode Component Unmount');
  }
})

</script>

<template>
  <div class="ImgDecode"><input type="file" @change="decodeImg" /></div>
</template>

<style scoped>
.ImgDecode {
  display: flex;
  justify-content: center;
  align-items: center;
  border: 1px solid black
}
</style>

Add VideoDecode and ImgDecode components in HelloWorld.vue

<script setup lang="ts">
import "../dbr"; // import side effects. The license, engineResourcePath, so on.
import { BarcodeScanner } from 'dynamsoft-javascript-barcode'
import VideoDecode from "./VideoDecode.vue";
import ImgDecode from './ImgDecode.vue'
import { ref, onMounted } from "vue";
import type { Ref } from 'vue'

const bShowScanner: Ref<boolean> = ref(true);
const bShowImgDecode: Ref<boolean> = ref(false)
onMounted(async () => {
  try {
    //Load the library on page load to speed things up.
    await BarcodeScanner.loadWasm();
  } catch (ex:any) {
    let errMsg = ex.message||ex;
    if (errMsg.includes("network connection error")) {
      errMsg = "Failed to connect to Dynamsoft License Server: network connection error. Check your Internet connection or contact Dynamsoft Support (support@dynamsoft.com) to acquire an offline license.";
    }
    console.error(errMsg);
    alert(errMsg);
  }
});
const showScanner = () => {
  bShowScanner.value = true;
  bShowImgDecode.value = false;
};
const showImgDecode = () => {
  bShowScanner.value = false;
  bShowImgDecode.value = true;
}
</script>

<template>
  <div className="helloWorld">
    <h1>Hello World for Nuxt</h1>
    <div>
      <button :style="{ marginRight: '10px', backgroundColor: bShowScanner ? 'rgb(255,174,55)' : 'white' }"
        @click="showScanner">Video Decode</button>
      <button :style="{ backgroundColor: bShowImgDecode ? 'rgb(255,174,55)' : 'white' }" @click="showImgDecode">Image
        Decode</button>
    </div>
    <div class="container">
      <VideoDecode v-if="bShowScanner"></VideoDecode>
      <ImgDecode v-if="bShowImgDecode"></ImgDecode>
    </div>
  </div>
</template>

<style scoped>
button {
  font-size: 1.5rem;
  margin-bottom: 2vh;
  border: 1px solid black;
}

.container {
  margin: 2vmin auto;
  text-align: center;
  font-size: medium;
  width: 80vw;
}

.applogo {
  height: 25px;
}

.helloWorld {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: #455a64;
}

h1 {
  font-size: 1.5em;
}
</style>

NOTE :

  • The method loadWasm() initializes the library in the background.

Add the HelloWorld component to app.vue

Edit the file App.vue to be like this

<template>
  <div>
    <HelloWorld />
  </div>
</template>
  • Try running the project.
npm run dev

If you have followed all the steps correctly, you should now have a functioning page that allows you to scan barcodes from a webcam or a built-in camera. Additionally, if you want to decode a local image, you can click the Image Decode button and select the image you want to decode. Any barcodes that are detected will be displayed in a dialog.

Project Setup

npm install

Compile and Hot-Reload for Development

npm run dev

Type-Check, Compile and Minify for Production

npm run build

This page is compatible for:

Version 7.5.0

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