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JavaScript Hello World Sample - Vue

Vue is a progressive framework for building user interfaces. Check out the following guide on how to implement Dynamsoft Barcode Reader JavaScript SDK (hereafter called “the library”) into a Vue 2 application.

Official Sample

Preparation

Make sure you have node installed. node 14.21.3 and vue 2.7.7 are used in the example below.

Create the sample project

Create a Bootstrapped Raw Vue Application

npm create vue@2

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

npm install
npm install dynamsoft-javascript-barcode

Start to implement

Add a file “dbr.js” under “/src/” to configure the library

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

<template>
  <div v-once 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
            d="M0.9,14V4.3h2.3c0.6,0,1,0.1,1.4,0.3c0.3,0.2,0.6,0.5,0.7,0.9s0.2,0.8,0.2,1.4c0,0.5-0.1,0.9-0.2,1.3 C5.1,8.5,4.9,8.8,4.5,9.1C4.2,9.3,3.7,9.4,3.2,9.4H1.8V14H0.9z M1.8,8.7h1.2c0.4,0,0.7-0.1,1-0.2S4.3,8.2,4.4,8 c0.1-0.3,0.2-0.6,0.2-1.1c0-0.5,0-0.9-0.1-1.2C4.3,5.4,4.2,5.2,3.9,5.1S3.4,5,2.9,5H1.8V8.7z" />
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            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>

<script>
import { BarcodeScanner } from "dynamsoft-javascript-barcode";

export default {
  data() {
    return {
      pScanner: null,
    };
  },
  async mounted() {
    try {
      const scanner = await (this.pScanner = BarcodeScanner.createInstance());
      await scanner.setUIElement(this.$el);
      scanner.onFrameRead = (results) => {
        for (let result of results) {
          console.log(result.barcodeText);
        }
      };
      scanner.onUniqueRead = (txt, result) => {
        alert(txt, result);
      };
      await scanner.open();
    } catch (ex) {
      let errMsg;
      if (ex.message.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.";
      } else {
        errMsg = ex.message||ex;
      }
      console.error(errMsg);
      alert(errMsg);
    }
  },
  async beforeDestroy() {
    if (this.pScanner) {
      (await this.pScanner).destroyContext();
      console.log("BarcodeScanner Component Unmount");
    }
  },
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<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%;
  }
}
</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(this.$el);
To release resources timely, the BarcodeScanner instance is destroyed with the component in the callback beforeDestroy .

Create and 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.

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

<script>
import { BarcodeReader } from 'dynamsoft-javascript-barcode'
export default {
  name: 'ImgDecode',
  data() {
    return {
      pReader: null,
    }
  },
  methods: {
    async decodeImg(e) {
      try {
        const reader = await (this.pReader = this.pReader || BarcodeReader.createInstance());
        let results = await reader.decode(e.target.files[0]);
        for (let result of results) {
          alert(result.barcodeText);
        }
        if (!results.length) { alert('No barcode found'); }
      } catch (ex) {
        let errMsg;
        if (ex.message.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.";
        } else {
          errMsg = ex.message||ex;
        }
        console.error(errMsg);
        alert(errMsg);
      }
      e.target.value = '';
    }
  },
  async beforeDestroy() {
    if (this.pReader) {
      (await this.pReader).destroyContext();
      console.log('ImgDecode Component Unmount');
    }
  },
}
</script>

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

Add `VideoDecode` and `ImgDecode` components in `HelloWorld.vue`

<template>
  <div class="helloWorld">
    <h1>Hello World for Vue<img class="applogo" alt="Vue logo" src="../assets/logo.png" /></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>

<script>
import "../dbr"; // import side effects. The license, engineResourcePath, so on.
import { BarcodeReader } from "dynamsoft-javascript-barcode";
import VideoDecode from "./VideoDecode";
import ImgDecode from './ImgDecode.vue'

export default {
  name: "HelloWorld",
  data() {
    return {
      bShowScanner: true,
      bShowImgDecode: false
    };
  },
  async mounted() {
    //Load the library on page load to speed things up.
    try {
      await BarcodeReader.loadWasm();
    } catch (ex) {
      let errMsg;
      if (ex.message.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.";
      } else {
        errMsg = ex.message||ex;
      }
      console.error(errMsg);
      alert(errMsg);
    }
  },
  components: {
    VideoDecode, ImgDecode
  },
  methods: {
    showScanner() {
      this.bShowScanner = true;
      this.bShowImgDecode = false;
    },
    showImgDecode() {
      this.bShowScanner = false;
      this.bShowImgDecode = true;
    }
  },
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h1 {
  font-size: 1.5em;
}

.applogo {
  height: 25px;
}

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

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

.container {
  margin: 2vmin auto;
  text-align: center;
  font-size: medium;
  width: 80vw;
}
</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 id="app">
    <HelloWorld />
  </div>
</template>

<script>
import HelloWorld from "./components/HelloWorld.vue";

export default {
  name: "App",
  components: {
    HelloWorld,
  },
};
</script>

<style>
</style>

Try running the project.

npm run dev

If you followed all the steps correctly, you will have a working page that turns one of the cameras hooked to or built in your computer or mobile device into a barcode scanner. Also, if you want to decode a local image, just click the Image Decode button and select the image you want to decode. Once barcodes are found, the results will show in a dialog.

Project setup

npm install

Compile and Hot-Reload for Development

npm run dev

Compile and Minify for Production

npm run build