ws_chrome_debugging_example/examples/recording/index.html at master · Jacarte/ws_chrome_debugging_example · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div>
        <input id="ws_address" placeholder="websocket address"/>
        <button id="start_btn">Start</button>
        <img id="preview" style="position:absolute; width: 100%; border: 1px solid white; height:100%; left: 0; top:40px"/>
    </div>
    <script>
        document.getElementById("start_btn").onclick = function(e){

            const address = document.getElementById("ws_address").value

            ws = new WebSocket(address);

            ws.onopen = function open() {

                ws.send(JSON.stringify({id: 3, method: 'Page.enable'}))
                ws.send(JSON.stringify({id: 5, method: 'Runtime.enable'}))


            }

            ws.onmessage = function incoming(data) {

                const obj = JSON.parse(data.data)

                console.log(obj)
                if(obj.id === 3){

                    ws.send(JSON.stringify({
                        id: 1001,
                        method: "Page.navigate",
                        params: {
                            url: "http://kth.se"
                        }
                    }))

                }

                if(obj.id === 1001){

                    setInterval(function() {

                            ws.send(JSON.stringify({
                            id: 1000,
                            method: "Page.captureScreenshot"
                        }))
                    }, 1000)

                }

                if(obj.id === 1000){
                    document.getElementById("preview").src = `data:image/png;base64,${obj.result.data}`
                }

            };

        }
    </script>
</body>
</html>