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webassembly/README: Update README to describe new stdout behaviour. 

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2022-11-07 17:16:26 +11:00
parent db978d7155
commit 1ed740b152
1 changed files with 13 additions and 8 deletions
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21
ports/webassembly/README.md
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@ -55,9 +55,9 @@ mp_js_do_str("print('hello world')\n");
Running with HTML Running with HTML
----------------- -----------------
The prerequisite for browser operation of micropython.js is an element with The prerequisite for browser operation of micropython.js is to listen to the
the id `mp_js_stdout` which receives `print` events. The following code `micropython-print` event, which is passed data when MicroPython code prints
demonstrates basic functionality: something to stdout. The following code demonstrates basic functionality:
```html ```html
<!doctype html> <!doctype html>
@ -66,14 +66,19 @@ demonstrates basic functionality:
<script src="build/micropython.js"></script> <script src="build/micropython.js"></script>
</head> </head>
<body> <body>
<div id='mp_js_stdout'></div> <pre id="micropython-stdout"></pre>
<script> <script>
mp_js_stdout.addEventListener('print', function(e) { document.addEventListener("micropython-print", function(e) {
document.write(e.data); let output = document.getElementById("micropython-stdout");
output.innerText += e.data;
}, false); }, false);
mp_js_init(64 * 1024); var mp_js_startup = Module["onRuntimeInitialized"];
mp_js_do_str('print(\'hello world\')'); Module["onRuntimeInitialized"] = async function() {
mp_js_startup();
mp_js_init(64 * 1024);
mp_js_do_str("print('hello world')");
};
</script> </script>
</body> </body>
</html> </html>