I have the $attr array that contains the id and footer caption of each graph (highcharts) in a post. When i print_r the array it groups the id and footer_caption correctly and in the right order as they are in the post. For eg in the current post im working at i have 3 graphs and this is what's inside $attr:
Array
(
[chart] => 23
[footer_caption] => footer test
)
Array
(
[chart] => 22
[footer_caption] => another test
)
Array
(
[chart] => 24
[footer_caption] => And another test
)
I'm passing $attr['footer_caption] to javascript like this:
<script>
var captionLabel = "<?php echo $attr['footer_caption']; ?>";
console.log(captionLabel);
</script>
And its working fine. Then the problem happens when i use captionLabel on te js file. I tried using a for loop but with no luck. If i console.log captionLabel in the js file, it shows the footer caption of the last graph 3 times. This is the highcharts.js where im using captionLabel:
Highcharts.setOptions({
credits: {
enabled: false
},
chart: {
type: 'column',
events: {
load: function () {
var label = this.renderer.label(captionLabel)
.css({
width: '400px',
fontSize: '9px'
})
.attr({
'r': 2,
'padding': 5
})
.add();
label.align(Highcharts.extend(label.getBBox(), {
align: 'center',
x: 0, // offset
verticalAlign: 'bottom',
y: 20 // offset
}), null, 'spacingBox');
}
},
marginBottom: 120
},
legend: {
align: 'center',
verticalAlign: 'bottom',
y: -30
},
My question is how can i pass the right footer_caption string to each graph in this js? Because right now every footer label is getting the last value. All the 3 graphs get the footer caption "And another test" in this post.
Use json_encode()
<?php
$labels = [
[
['chart'] => 23,
['footer_caption'] => 'footer test 1'
],[
['chart'] => 24,
['footer_caption'] => 'footer test 2'
],[
['chart'] => 25,
['footer_caption'] => 'footer test 3 '
]
];
?>
<script>
var captionLabels = "<?php echo json_encode($labels); ?>";
console.log(captionLabels);
var label;
//access each one like this
captionLabels.forEach(function(label) {
label = this.renderer.label(label.footer_caption);
//graph code.
});
</script>
captionLabel has to be an array, otherwise it will only hold the last value assigned to it. You should also use an array for all the $attr values and then use json_encode when outputting itto the JavaScript.
<?php
$attr = [
['chart' => '23', 'footer_caption' => 'footer test'],
['chart' => '22', 'footer_caption' => 'another test'],
['chart' => '24', 'footer_caption' => 'And another test']
];
?>
<script>
var captionLabel = <?= json_encode($attr) ?>;
</script>
I think you should generate the array of footer_caption text and send it to javascript as a JSON string.
PHP code:
$array = new array();
foreach ($attr as $value) {
array_push($array, $value['footer_caption']);
}
$captionLabel = json_encode($array);
JS code:
<script>
var captionLabel = JSON.parse("<?php echo $captionLabel; ?>");
console.log(captionLabel);
</script>