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<!DOCTYPE html>
<html>
<body>
<form action="javascript:updateDom()">
<label for="typer">New label text:</label>
<input name="typer" type="text"/>
<br/>
<label for="color">Select label color:</label>
<input name="color" id="red" value="red" type="radio"/>Red
<input name="color" id="green" value="green" type="radio"/>Green
<br/>
<input name="submit" type="submit" value="Add Label"/>
</form>
<div id="update_butter" style="display:none"></div>
<script>
var butter = document.getElementById('update_butter');
var textProperty = butter['innerText'] ? 'innerText' : 'textContent';
var listeners = [];
function registerListener(fn) {
listeners.push(fn);
}
function updateDom() {
butter.style.display = 'block';
butter[textProperty] = 'Updating';
disableForm();
tick();
}
function disableForm() {
var inputs = document.getElementsByTagName('input');
for (var i = 0, input; input = inputs[i]; ++i) {
input.disabled = true;
}
}
function enableForm() {
var inputs = document.getElementsByTagName('input');
for (var i = 0, input; input = inputs[i]; ++i) {
input.disabled = false;
}
}
function tick() {
var length = butter[textProperty].substring('Updating'.length).length;
if (length != 10) {
butter[textProperty] += '.';
window.setTimeout(tick, 500);
} else {
enableForm();
var div = document.createElement('div');
var colors = document.forms[0].color;
for (var i = 0, color; color = colors[i]; ++i) {
if (color.checked) {
div.style.backgroundColor = color.value;
break;
}
}
div[textProperty] = document.forms[0].typer.value;
div.className = 'label';
document.forms[0].typer.value = '';
document.body.appendChild(div);
butter[textProperty] = 'Done!';
window.setTimeout(function() {
while (listeners.length) {
try {
listeners.shift()(div[textProperty]);
} catch (e) {
butter[textProperty] = "Exception seen: " + e;
}
}
}, 500);
}
}
</script>
</body>
</html>
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