<!DOCTYPE html>
<html>
<head>
<title>FormData</title>
<style>
.code-block {
background-color: grey;
color: lightgrey;
border-radius: 2px;
padding: 5px;
}
</style>
<script>
function log(s) {
document.getElementById("out").innerHTML += `${s}\n`;
}
function dumpFormContents() {
let form = document.getElementById("form1");
form.onformdata = (e) => {
log("Event 'formdata' fired.");
log(`First name logged from the formdata event: ${e.formData.get("first_name")}\n`);
}
let formData = new FormData(form);
let firstName = formData.get("first_name");
let lastName = formData.get("last_name");
let file = formData.get("avatar");
let transportTypes = formData.getAll("transport_type");
log(`First name: ${firstName}`);
log(`Last name: ${lastName}`);
log(`file: ${file.type}`);
log("Transportation types:");
for (let i = 0; transportTypes.length > i; i++)
log(` - ${transportTypes[i]}`);
log("\n Iterate over keys: ")
for (let key of formData.keys()) {
log(`Key: ${key}`);
}
log("\n Iterate over values: ")
for (let value of formData.values()) {
log(`Value: ${value}`);
}
log("\n Iterate over entries: ")
for (let entry of formData.entries()) {
log(`Entry: ${entry[0]}, ${entry[1]}`);
}
}
function postMultipartFormData() {
let form = document.getElementById("form1");
let formData = new FormData(form);
let xhr = new XMLHttpRequest;
xhr.open("POST", "http://localhost:8000");
xhr.send(formData);
}
</script>
</head>
<body>
<form id="form1">
<label for="first_name">First name:</label><br>
<input type="text" id="first_name" name="first_name" value="John"/><br>
<label for="last_name">Last name:</label><br>
<input type="text" id="last_name" name="last_name" value="Doe"/><br>
<label for="avatar">Avatar:</label><br>
<input type="file" id="avatar" name="avatar"/><br>
<p>How do you usually transport yourself?</p>
<input type="checkbox" id="transport_type1" name="transport_type" value="walking"/>
<label for="transport_type1">Walk</label><br>
<input type="checkbox" id="transport_type2" name="transport_type" value="public-transport"/>
<label for="transport_type2">Public transportation</label><br>
<input type="checkbox" id="transport_type3" name="transport_type" value="bicycle"/>
<label for="transport_type3">Bicycle</label><br>
<input type="checkbox" id="transport_type4" name="transport_type" value="motorcycle"/>
<label for="transport_type4">Motorcycle</label><br>
<input type="checkbox" id="transport_type5" name="transport_type" value="car"/>
<label for="transport_type5">Car</label><br>
</form>
<button onclick="dumpFormContents()">Test FormData Features</button>
<div style="padding-top: 30px; padding-left: 5px">To test multipart/form-data start a simple echo server:</div>
<div style="padding-left: 10px; padding-bottom: 10px"><span class="code-block">while true; do printf 'HTTP/1.1 200 OK\n' | nc -Nl 8000; done</span></div>
<button onclick="postMultipartFormData()">Test multipart/form-data</button>
<pre id="out"></pre>
</body>
