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writefreely
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Code Issues Releases Wiki Activity

Only load js when there are blocks to highlight 

Crux was the load event for the script tag inserted.
This commit is contained in:
Marcel van der Boom 2018-11-22 14:31:25 +01:00
parent 8144c9581d
commit add06ee56c
1 changed files with 21 additions and 7 deletions
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28
templates/include/render.tmpl
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@ -2,15 +2,29 @@
{{define "highlighting"}}
<!-- TODO: make this conditional on presence of code blocks -->
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/styles/atom-one-light.min.css"/>
<script type="text/javascript"
src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/highlight.min.js" async></script>
<script>
addEventListener('load', function () {
var x = document.querySelectorAll("code[class^='language-']");
for (i=0; i<x.length; i++) {
hljs.highlightBlock(x[i]);
}});
// TODO: this feels more like a mutation observer
addEventListener('DOMContentLoaded', function () {
var hlbaseUri="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/";
var x = document.querySelectorAll("code[class^='language-']");
if (x.length > 0 ) {
// We have blocks to be highlighted, stuff, so we load css + js
var s=document.createElement('script');
s.type="text/javascript"; s.src= hlbaseUri + "highlight.min.js"; s.async=true;
// Here's the crux, we need to react on load event for this new element to make it work.
s.onload = () => { highlight(x) }
document.getElementsByTagName('head')[0].appendChild(s);
// Gives a set of nodes, run highlighting on them
function highlight(nodes) {
for (i=0; i<nodes.length; i++) {
hljs.highlightBlock(nodes[i]);
}
}
}
});
</script>
{{end}}