getPorts() method return nothing

[Christian LeMoussel]

I'm new to Chrome Extension development. I am trying to develop an extension with the use of Web Serial.

If I use requestPort() method, like this :

    <button id="connect">Connect</button>

    <script>
        const connectButton = document.getElementById("connect");
        connectButton.addEventListener('click', async () => {
            try {
                const port = await navigator.serial.requestPort();
                console.log(port)
            } catch (e) {
                console.error(e)
            }
        });

    </script>

It's OK, to prompt the user for which device the site should be allowed to control.
    
    

But with getPorts() method, like this :

    <script>
        const connectButton = document.getElementById("connect");
        connectButton.addEventListener('click', async () => {
            try {
                const ports = await navigator.serial.getPorts();
                console.log(ports)
            } catch (e) {
                console.error(e)
            }
        });

    </script>

I got nothing with ports.length == 0   

Any idea what I didn't understand?

[Jackie Han]

I did a simple test.

1. await navigator.serial.requestPort(); and select one

2. then await navigator.serial.getPorts(); will return that port, no problem

As the document says, getPorts return ports that were requested before. So if it didn't request, no ports would return.

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[Christian LeMoussel]

Ok, I'll check it out. Thanks.