Preview hex color in HTML with Prototype
In an ongoing work for some client, I had to make a small form to build front-end skins for the website.
3 colors were part of the skin and the client wanted to preview the color as he was typing the hex value.
I ended with a few javascript lines of code based on Prototype (great JS Framework).
Here is the code :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Page Title</title>
<style type="text/css" media="screen">
.preview_color {
width: 50px;
height: 24px;
background-color: #fff;
border: 1px solid #ccc;
display: block;
float: left;
}
</style>
<script src='https://ajax.googleapis.com/ajax/libs/prototype/1.7.3.0/prototype.js' type='text/javascript' language='Javascript'
charset='iso-8859-1'></script>
<script type="text/javascript" charset="utf-8">
function changeColor(el, value) {
var color = value
$('preview_' + el.name).style.backgroundColor = "#" + color
}
Event.observe(window, 'load', function() {
new Form.Element.Observer('color_1', 0.2, changeColor)
new Form.Element.Observer('color_2', 0.2, changeColor)
new Form.Element.Observer('color_3', 0.2, changeColor)
});
</script>
</head>
<body>
<form>
<table border="0" cellspacing="5" cellpadding="5">
<tr>
<th>
<label for="color_1">Couleur 1 : </label>
</th>
<td>
#<input type="text" name="color_1" id="color_1" maxlength="6" size="6" />
</td>
<td>
<div id="preview_color_1" class="preview_color" ></div>
</td>
</tr>
<tr>
<th>
<label for="color_2">Couleur 2 : </label>
</th>
<td>
#<input type="text" name="color_2" id="color_2" maxlength="6" size="6" />
</td>
<td>
<div id="preview_color_2" class="preview_color" ></div>
</td>
</tr>
<tr>
<th>
<label for="color_3">Couleur 3 : </label>
</th>
<td>
#<input type="text" name="color_3" id="color_3" maxlength="6" size="6" />
</td>
<td>
<div id="preview_color_3" class="preview_color" ></div>
</td>
</tr>
</table>
</form>
</body>
</html>