Simple
All other demos on this page utilize single-file components. To use them in your project you need a bundler like vite. For an example that works without a build step and right in the browser:
Source
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple Demo</title>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script src="https://unpkg.com/vue-qrcode-reader@5/dist/vue-qrcode-reader.umd.js"></script>
</head>
<body>
<div id="app">
<h1>Simple Demo</h1>
<p style="color: red">{{ error }}</p>
<p>Last result: <b>{{ result }}</b></p>
<div style="border: 2px solid black">
<qrcode-stream :track="paintBoundingBox" @detect="onDetect" @error="onError"></qrcode-stream>
</div>
</div>
</body>
<script>
const { createApp, ref } = Vue
const result = ref('')
const error = ref('')
function paintBoundingBox(detectedCodes, ctx) {
for (const detectedCode of detectedCodes) {
const {
boundingBox: { x, y, width, height }
} = detectedCode
ctx.lineWidth = 2
ctx.strokeStyle = '#007bff'
ctx.strokeRect(x, y, width, height)
}
}
function onError(err) {
error.value = `[${err.name}]: `
if (err.name === 'NotAllowedError') {
error.value += 'you need to grant camera access permission'
} else if (err.name === 'NotFoundError') {
error.value += 'no camera on this device'
} else if (err.name === 'NotSupportedError') {
error.value += 'secure context required (HTTPS, localhost)'
} else if (err.name === 'NotReadableError') {
error.value += 'is the camera already in use?'
} else if (err.name === 'OverconstrainedError') {
error.value += 'installed cameras are not suitable'
} else if (err.name === 'StreamApiNotSupportedError') {
error.value += 'Stream API is not supported in this browser'
} else if (err.name === 'InsecureContextError') {
error.value += 'Camera access is only permitted in secure context. Use HTTPS or localhost rather than HTTP.'
} else {
error.value += err.message
}
}
function onDetect(detectedCodes) {
result.value = JSON.stringify(
detectedCodes.map(code => code.rawValue)
)
}
const app = createApp({
setup() {
return { result, error, onDetect, onError, paintBoundingBox }
}
})
app.use(VueQrcodeReader)
app.mount('#app')
</script>
</html>