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.
This question is related to
javascript
jquery
css
rating
The answer is
Try this jquery helper function/file
jquery.Rating.js
//ES5
$.fn.stars = function() {
return $(this).each(function() {
var rating = $(this).data("rating");
var fullStar = new Array(Math.floor(rating + 1)).join('<i class="fas fa-star"></i>');
var halfStar = ((rating%1) !== 0) ? '<i class="fas fa-star-half-alt"></i>': '';
var noStar = new Array(Math.floor($(this).data("numStars") + 1 - rating)).join('<i class="far fa-star"></i>');
$(this).html(fullStar + halfStar + noStar);
});
}
//ES6
$.fn.stars = function() {
return $(this).each(function() {
const rating = $(this).data("rating");
const numStars = $(this).data("numStars");
const fullStar = '<i class="fas fa-star"></i>'.repeat(Math.floor(rating));
const halfStar = (rating%1!== 0) ? '<i class="fas fa-star-half-alt"></i>': '';
const noStar = '<i class="far fa-star"></i>'.repeat(Math.floor(numStars-rating));
$(this).html(`${fullStar}${halfStar}${noStar}`);
});
}
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Star Rating</title>
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.9.0/css/all.min.css" rel="stylesheet">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="js/jquery.Rating.js"></script>
<script>
$(function(){
$('.stars').stars();
});
</script>
</head>
<body>
<span class="stars" data-rating="3.5" data-num-stars="5" ></span>
</body>
</html>
I ended up going totally JS-free to avoid client-side render lag. To accomplish that, I generate HTML like this:
<span class="stars" title="{value as decimal}">
<span style="width={value/5*100}%;"/>
</span>
To help with accessibility, I even add the raw rating value in the title attribute.
using jquery without prototype, update the js code to
$( ".stars" ).each(function() {
// Get the value
var val = $(this).data("rating");
// 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);
});
I also added a data attribute by the name of data-rating in the span.
<span class="stars" data-rating="4" ></span>
If you only have to support modern browsers, you can get away with:
- No images;
- Mostly static css;
- Nearly no jQuery or Javascript;
You only need to convert the number to a class, e.g. class='stars-score-50'.
First a demo of "rendered" markup:
body { font-size: 18px; }_x000D_
_x000D_
.stars-container {_x000D_
position: relative;_x000D_
display: inline-block;_x000D_
color: transparent;_x000D_
}_x000D_
_x000D_
.stars-container:before {_x000D_
position: absolute;_x000D_
top: 0;_x000D_
left: 0;_x000D_
content: '?????';_x000D_
color: lightgray;_x000D_
}_x000D_
_x000D_
.stars-container:after {_x000D_
position: absolute;_x000D_
top: 0;_x000D_
left: 0;_x000D_
content: '?????';_x000D_
color: gold;_x000D_
overflow: hidden;_x000D_
}_x000D_
_x000D_
.stars-0:after { width: 0%; }_x000D_
.stars-10:after { width: 10%; }_x000D_
.stars-20:after { width: 20%; }_x000D_
.stars-30:after { width: 30%; }_x000D_
.stars-40:after { width: 40%; }_x000D_
.stars-50:after { width: 50%; }_x000D_
.stars-60:after { width: 60%; }_x000D_
.stars-70:after { width: 70%; }_x000D_
.stars-80:after { width: 80%; }_x000D_
.stars-90:after { width: 90%; }_x000D_
.stars-100:after { width: 100; }Within block level elements:_x000D_
_x000D_
<div><span class="stars-container stars-0">?????</span></div>_x000D_
<div><span class="stars-container stars-10">?????</span></div>_x000D_
<div><span class="stars-container stars-20">?????</span></div>_x000D_
<div><span class="stars-container stars-30">?????</span></div>_x000D_
<div><span class="stars-container stars-40">?????</span></div>_x000D_
<div><span class="stars-container stars-50">?????</span></div>_x000D_
<div><span class="stars-container stars-60">?????</span></div>_x000D_
<div><span class="stars-container stars-70">?????</span></div>_x000D_
<div><span class="stars-container stars-80">?????</span></div>_x000D_
<div><span class="stars-container stars-90">?????</span></div>_x000D_
<div><span class="stars-container stars-100">?????</span></div>_x000D_
_x000D_
<p>Or use it in a sentence: <span class="stars-container stars-70">?????</span> (cool, huh?).</p>Then a demo that uses a wee bit of code:
$(function() {_x000D_
function addScore(score, $domElement) {_x000D_
$("<span class='stars-container'>")_x000D_
.addClass("stars-" + score.toString())_x000D_
.text("?????")_x000D_
.appendTo($domElement);_x000D_
}_x000D_
_x000D_
addScore(70, $("#fixture"));_x000D_
});body { font-size: 18px; }_x000D_
_x000D_
.stars-container {_x000D_
position: relative;_x000D_
display: inline-block;_x000D_
color: transparent;_x000D_
}_x000D_
_x000D_
.stars-container:before {_x000D_
position: absolute;_x000D_
top: 0;_x000D_
left: 0;_x000D_
content: '?????';_x000D_
color: lightgray;_x000D_
}_x000D_
_x000D_
.stars-container:after {_x000D_
position: absolute;_x000D_
top: 0;_x000D_
left: 0;_x000D_
content: '?????';_x000D_
color: gold;_x000D_
overflow: hidden;_x000D_
}_x000D_
_x000D_
.stars-0:after { width: 0%; }_x000D_
.stars-10:after { width: 10%; }_x000D_
.stars-20:after { width: 20%; }_x000D_
.stars-30:after { width: 30%; }_x000D_
.stars-40:after { width: 40%; }_x000D_
.stars-50:after { width: 50%; }_x000D_
.stars-60:after { width: 60%; }_x000D_
.stars-70:after { width: 70%; }_x000D_
.stars-80:after { width: 80%; }_x000D_
.stars-90:after { width: 90%; }_x000D_
.stars-100:after { width: 100; }<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
Generated: <div id="fixture"></div>The biggest downsides of this solution are:
- You need the stars inside the element to generate correct width;
- There's no semantic markup, e.g. you'd prefer the score as text inside the element;
- It only allows for as many scores as you'll have classes (because we can't use Javascript to set a precise
widthon a pseudo-element).
To fix this the solution above can be easily tweaked. The :before and :after bits need to become actual elements in the DOM (so we need some JS for that).
The latter is left as an excercise for the reader.
Why not just have five separate images of a star (empty, quarter-full, half-full, three-quarter-full and full) then just inject the images into your DOM depending on the truncated or rouded value of rating multiplied by 4 (to get a whole numner for the quarters)?
For example, 4.8618164 multiplied by 4 and rounded is 19 which would be four and three quarter stars.
Alternatively (if you're lazy like me), just have one image selected from 21 (0 stars through 5 stars in one-quarter increments) and select the single image based on the aforementioned value. Then it's just one calculation followed by an image change in the DOM (rather than trying to change five different images).
You can do it with 2 images only. 1 blank stars, 1 filled stars.
Overlay filled image on the top of the other one. and convert rating number into percentage and use it as width of fillter image.
.containerdiv {
border: 0;
float: left;
position: relative;
width: 300px;
}
.cornerimage {
border: 0;
position: absolute;
top: 0;
left: 0;
overflow: hidden;
}
img{
max-width: 300px;
}
Here's my take using JSX and font awesome, limited on only .5 accuracy, though:
<span>
{Array(Math.floor(rating)).fill(<i className="fa fa-star"></i>)}
{(rating) - Math.floor(rating)==0 ? ('') : (<i className="fa fa-star-half"></i>)}
</span>
First row is for whole star and second row is for half star (if any)
Source: Stackoverflow.com