I have been looking at jquery plugin and was wondering how to adapt that plugin to turn a number (like 4.8618164) into a 4.8618164 stars filled out of 5. Basically interpreting a number <5 into stars filled in a 5-star rating system using jQuery/JS/CSS.
Note that this would only display/show the stars rating from an already available number and not accept new ratings submissions.
Just set . star width to 24 and . star. half:after margin-left to -24px, width to 12px, and the half-stars will render correctly.
Here's a solution for you, using only one very tiny and simple image and one automatically generated span element:
span.stars, span.stars span { display: block; background: url(stars.png) 0 -16px repeat-x; width: 80px; height: 16px; } span.stars span { background-position: 0 0; }
(source: ulmanen.fi)
Note: do NOT hotlink to the above image! Copy the file to your own server and use it from there.
$.fn.stars = function() { return $(this).each(function() { // Get the value var val = parseFloat($(this).html()); // Make sure that the value is in 0 - 5 range, multiply to get width var size = Math.max(0, (Math.min(5, val))) * 16; // Create stars holder var $span = $('<span />').width(size); // Replace the numerical value with stars $(this).html($span); }); }
If you want to restrict the stars to only half or quarter star sizes, add one of these rows before the var size
row:
val = Math.round(val * 4) / 4; /* To round to nearest quarter */ val = Math.round(val * 2) / 2; /* To round to nearest half */
<span class="stars">4.8618164</span> <span class="stars">2.6545344</span> <span class="stars">0.5355</span> <span class="stars">8</span>
$(function() { $('span.stars').stars(); });
(source: ulmanen.fi)
http://www.ulmanen.fi/stuff/stars.php
This will probably suit your needs. With this method you don't have to calculate any three quarter or whatnot star widths, just give it a float and it'll give you your stars.
A small explanation on how the stars are presented might be in order.
The script creates two block level span elements. Both of the spans initally get a size of 80px * 16px and a background image stars.png. The spans are nested, so that the structure of the spans looks like this:
<span class="stars"> <span></span> </span>
The outer span gets a background-position
of 0 -16px
. That makes the gray stars in the outer span visible. As the outer span has height of 16px and repeat-x
, it will only show 5 gray stars.
The inner span on the other hand has a background-position
of 0 0
which makes only the yellow stars visible.
This would of course work with two separate imagefiles, star_yellow.png and star_gray.png. But as the stars have a fixed height, we can easily combine them into one image. This utilizes the CSS sprite technique.
Now, as the spans are nested, they are automatically overlayed over each other. In the default case, when the width of both spans is 80px, the yellow stars completely obscure the grey stars.
But when we adjust the width of the inner span, the width of the yellow stars decreases, revealing the gray stars.
Accessibility-wise, it would have been wiser to leave the float number inside the inner span and hide it with text-indent: -9999px
, so that people with CSS turned off would at least see the floating point number instead of the stars.
Hopefully that made some sense.
Now even more compact and harder to understand! Can also be squeezed down to a one liner:
$.fn.stars = function() { return $(this).each(function() { $(this).html($('<span />').width(Math.max(0, (Math.min(5, parseFloat($(this).html())))) * 16)); }); }
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