I implemented a stars rating system on my one page html site. The system uses jQuery, AJAX and PHP. I found the code here and it works well regarding the storage of the ratings and the updating of the votes.
This is the Javascript code:
// STARS
$(document).ready(function() {
$('.rate_widget').each(function(i) {
var widget = this;
var out_data = {
widget_id : $(widget).attr('id'),
fetch: 1
};
$.post(
'ratings.php',
out_data,
function(INFO) {
$(widget).data( 'fsr', INFO );
set_votes(widget);
},
'json'
);
});
$('.ratings_stars').hover(
// Handles the mouseover
function() {
$(this).prevAll().andSelf().addClass('ratings_over');
$(this).nextAll().removeClass('ratings_vote');
},
// Handles the mouseout
function() {
$(this).prevAll().andSelf().removeClass('ratings_over');
// can't use 'this' because it wont contain the updated data
set_votes($(this).parent());
}
);
// This actually records the vote
$('.ratings_stars').bind('click', function() {
var star = this;
var widget = $(this).parent();
var clicked_data = {
clicked_on : $(star).attr('class'),
widget_id : $(star).parent().attr('id')
};
$.post(
'ratings.php',
clicked_data,
function(INFO) {
widget.data( 'fsr', INFO );
set_votes(widget);
},
'json'
);
});
});
function set_votes(widget) {
var avg = $(widget).data('fsr').whole_avg;
var votes = $(widget).data('fsr').number_votes;
var exact = $(widget).data('fsr').dec_avg;
window.console && console.log('and now in set_votes, it thinks the fsr is ' + $(widget).data('fsr').number_votes);
$(widget).find('.star_' + avg).prevAll().andSelf().addClass('ratings_vote');
$(widget).find('.star_' + avg).nextAll().removeClass('ratings_vote');
$(widget).find('.total_votes').text(votes);
$(widget).find('.avg_votes').text(exact);
}
// END STARS
There is a PHP script for storing and update the ratings:
$rating = new ratings($_POST['widget_id']);
isset($_POST['fetch']) ? $rating->get_ratings() : $rating->vote();
class ratings {
var $data_file = './ratings.data.txt';
private $widget_id;
private $data = array();
function __construct($wid) {
$this->widget_id = $wid;
$all = file_get_contents($this->data_file);
if($all) {
$this->data = unserialize($all);
}
}
public function get_ratings() {
if($this->data[$this->widget_id]) {
echo json_encode($this->data[$this->widget_id]);
}
else {
$data['widget_id'] = $this->widget_id;
$data['number_votes'] = 0;
$data['total_points'] = 0;
$data['dec_avg'] = 0;
$data['whole_avg'] = 0;
echo json_encode($data);
}
}
public function vote() {
# Get the value of the vote
preg_match('/star_([1-5]{1})/', $_POST['clicked_on'], $match);
$vote = $match[1];
$ID = $this->widget_id;
# Update the record if it exists
if($this->data[$ID]) {
$this->data[$ID]['number_votes'] += 1;
$this->data[$ID]['total_points'] += $vote;
}
# Create a new one if it doesn't
else {
$this->data[$ID]['number_votes'] = 1;
$this->data[$ID]['total_points'] = $vote;
}
$this->data[$ID]['dec_avg'] = round( $this->data[$ID]['total_points'] / $this->data[$ID]['number_votes'], 1 );
$this->data[$ID]['whole_avg'] = round( $this->data[$ID]['dec_avg'] );
file_put_contents($this->data_file, serialize($this->data));
$this->get_ratings();
}
# ---
# end class
}
And the ratings are obtained through this code inside my html page:
<div class='movie_choice'>
<div id="r1" class="rate_widget">
<div class="star_1 ratings_stars"></div>
<div class="star_2 ratings_stars"></div>
<div class="star_3 ratings_stars"></div>
<div class="star_4 ratings_stars"></div>
<div class="star_5 ratings_stars"></div>
<div itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating">
<div class="avg_votes" style="display: table-cell; float: left;" itemprop="ratingValue"></div><div style="float:left;">/</div><div itemprop="bestRating" style="float:left;">5</div><div style="float: left;">, </div><div class="total_votes" style="display: table-cell; float:left;" itemprop="ratingCount"></div><div style="width: 200px;"> voti</div>
</div>
</div>
</div>
The method works and show the correct average ratings and the total number of votes. The problem is that Google does not recognize the ratingValue
. In the testing tool for structured data, Google says me that "ratingValue field can't be empty". In other words, for Google the line of code <div class="avg_votes" style="display: table-cell; float: left;" itemprop="ratingValue"></div>
means that ratingValue
is empty, although the rating is correctly showed in the page.
I suppose the problem is that this method is based on jQuery and my page is in html, but I can't find the solution for this issue.
Do you know the source of the problem, please?