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index.html
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<html>
<head>
<title>Style Reactor - Compile LESS and Stylus in a Web Worker</title>
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript" src="https://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/js/bootstrap.min.js"></script>
<style>
body {
padding-top: 60px;
}
textarea {
font-family: monospace;
}
</style>
<style id="compiled"></style>
</head>
<body>
<div class="container">
<div class="hero-unit">
<h1>style_reactor.js</h1>
<p>Compile CSS Preprocessors in real-time using Web Workers.</p>
</div>
<form class="form-inline">
<div class="row">
<div class="span6">
<textarea class="input-block-level" rows="9" id="input"></textarea>
</div>
<div class="span6">
<textarea class="input-block-level ds-appended" rows="9" id="output"></textarea>
</div>
</div>
<hr>
<div class="row">
<div class="span4">
<select id="type">
<option value="less">LESS</option>
<option value="stylus">Stylus</option>
</select>
<label for="apply">
<input id="apply" type="checkbox">
Apply to Page
</label>
</div>
<div class="span8">
<div class="alert alert-danger hidden" id="error"></div>
</div>
</div>
</form>
</div>
<script type="text/javascript">
var reactor = new Worker("js/style_reactor.js");
var compileCSS = function() {
reactor.postMessage({
type: $("#type").val(),
source: $("#input").val()
});
}
$("#input").keyup(compileCSS);
$("#apply, #type").change(compileCSS);
reactor.addEventListener("message", function(e) {
if (!e.data) { return; }
if (e.data.error){
$("#error").text(e.data.error).removeClass('hidden');
} else if (e.data.css) {
$("#error").addClass('hidden');
$("#output").val(e.data.css);
if ($("#apply").is(":checked")) {
$("#compiled").text(e.data.css);
} else {
$("#compiled").text('');
}
} else {
$("#error").text("An unknown error occurred during compilation.").removeClass('hidden');
}
});
</script>
</body>
</html>