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Update javascript.md #426

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35 changes: 29 additions & 6 deletions snippets/markdown/image/tensorflowjs/javascript.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ Learn more about how to use the code snippet on [github](https://github.com/goog
```html
<div>Teachable Machine Image Model</div>
<button type="button" onclick="init()">Start</button>
<button type="button" onclick="stopWebcam()">Stop</button>
<div id="status">Initializing...</div>
<div id="webcam-container"></div>
<div id="label-container"></div>
<script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs@latest/dist/tf.min.js"></script>
Expand All @@ -14,10 +16,13 @@ Learn more about how to use the code snippet on [github](https://github.com/goog
// the link to your model provided by Teachable Machine export panel
const URL = "{{URL}}";

let model, webcam, labelContainer, maxPredictions;
let model, webcam, labelContainer, maxPredictions, isRunning = false;

// Load the image model and setup the webcam
async function init() {

document.getElementById("status").innerText = "Loading model...";

const modelURL = URL + "model.json";
const metadataURL = URL + "metadata.json";

Expand All @@ -33,14 +38,24 @@ Learn more about how to use the code snippet on [github](https://github.com/goog
webcam = new tmImage.Webcam(200, 200, flip); // width, height, flip
await webcam.setup(); // request access to the webcam
await webcam.play();
isRunning = true;
window.requestAnimationFrame(loop);

// append elements to the DOM
document.getElementById("webcam-container").innerHTML = "";
document.getElementById("webcam-container").appendChild(webcam.canvas);

labelContainer = document.getElementById("label-container");
for (let i = 0; i < maxPredictions; i++) { // and class labels
labelContainer.appendChild(document.createElement("div"));
labelContainer.innerHTML = "";
for (let i = 0; i < maxPredictions; i++) {
let label = document.createElement("div");
label.style.fontSize = "16px";
label.style.marginTop = "5px";
label.style.fontWeight = "bold";
labelContainer.appendChild(label);
}

document.getElementById("status").innerText = "Model loaded. Ready!";
}

async function loop() {
Expand All @@ -54,10 +69,18 @@ Learn more about how to use the code snippet on [github](https://github.com/goog
// predict can take in an image, video or canvas html element
const prediction = await model.predict(webcam.canvas);
for (let i = 0; i < maxPredictions; i++) {
const classPrediction =
prediction[i].className + ": " + prediction[i].probability.toFixed(2);
const classPrediction = `${prediction[i].className}: ${Math.round(prediction[i].probability * 100)}%`;
labelContainer.childNodes[i].innerHTML = classPrediction;
}
}

// stop webcam execution
function stopWebcam() {
if (webcam) {
webcam.stop();
isRunning = false;
document.getElementById("status").innerText = "Webcam stopped.";
}
}
</script>
```
```