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embed.html
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embed.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Embed Test</title>
<style media="screen">
body {
margin: 0;
padding: 30px;
font-family: sans-serif;
}
.row {
width: 100%;
display: flex;
justify-content: space-between;
align-items: stretch;
}
body > .row {
flex-grow: 1;
min-width: 200px;
flex-wrap: wrap;
margin-top: 1em;
}
body > .row > * {
flex-grow: 1;
min-width: 200px;
}
.row input,
.row textarea {
width: 100% !important;
margin-bottom: 1em;
}
#sendMessage,
#clearOutput {
position: sticky;
top: 1em;
}
#output {
font-family: monospace;
white-space: pre-wrap;
}
</style>
</head>
<body>
<iframe
id="ninja"
src="http://localhost:8080/"
width="100%"
height="600px"
style="width: 100%; height: 600px; max-height: 100vh"
frameborder="0"
allowfullscreen
></iframe>
<div class="row">
<fieldset>
<legend>Send Message</legend>
<form id="sendMessage" method="post">
<input name="action" placeholder="Action" />
<textarea name="value" placeholder="Value"></textarea>
<div class="row">
<input type="reset" value="Clear" />
<input type="submit" value="Send" />
</div>
</form>
</fieldset>
<fieldset>
<legend>Received Messages</legend>
<input
id="clearOutput"
type="button"
value="Clear"
onclick="output.value = ''"
/>
<output id="output"></output>
</fieldset>
</div>
<script type="text/javascript">
const form = document.getElementById("sendMessage");
window.addEventListener(
"message",
(event) => {
document.getElementById("output").value +=
JSON.stringify(event.data, null, 2) + "\n";
},
false
);
form.addEventListener(
"submit",
(event) => {
event.preventDefault();
const ninja = document.getElementById("ninja");
const data = new FormData(event.target);
const action = data.get("action");
const valueString = data.get("value");
let value;
try {
value = JSON.parse(valueString);
} catch (error) {
value = valueString;
}
try {
ninja.contentWindow.postMessage({ action, value }, "*");
} catch (error) {
console.error(error);
}
return false;
},
true
);
</script>
</body>
</html>