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reload markdown preview as users type #2

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reload markdown preview as users type #2

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66 changes: 32 additions & 34 deletions charts-render.js
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Original file line number Diff line number Diff line change
@@ -1,41 +1,39 @@
function contentLoaded() {

var chartElements = document.getElementsByClassName("chartjs");

var changes = [];

for (let index = 0; index < chartElements.length; index++) {
var element = chartElements.item(index);
var source = element.textContent;

changes.push({
placeholder: element.parentElement.parentElement,
chart: element,
source
});

// const log = s => {
// const p = document.createElement('p');
// p.innerText = s;
// document.body.appendChild(p);
// };

function contentLoaded() {
for (const canvas of document.querySelectorAll("canvas.chartjs")) {
const p = canvas.parentElement.parentElement;
if ('PRE' == p.tagName) {
// replace <pre><code><canvas> with just <canvas>
p.outerHTML = canvas.outerHTML;
}
}

for (let index = 0; index < changes.length; index++) {
const element = changes[index];
element.placeholder.outerHTML = element.chart.outerHTML;
}

var newchartElements = document.getElementsByClassName("chartjs");

for (let index = 0; index < newchartElements.length; index++) {
var element = newchartElements.item(index);
var source = element.textContent.replace(/(['"])?([a-zA-Z0-9_]+)(['"])?:/g, '"$2": ');
new Chart(element.getContext("2d"), JSON.parse(source.trim()));
for (const canvas of document.querySelectorAll("canvas.chartjs")) {
if ('initialized' == canvas.getAttribute('data-chartjs-status')) {
continue;
}

canvas.setAttribute('data-chartjs-status', 'initialized');

try {
const json = JSON.parse(canvas.textContent);
new Chart(canvas.getContext("2d"), json);
}
catch (e) {
// invalid json syntax!
canvas.outerHTML = `<pre><code>${e}</code></pre>`;
}
}

}

window.addEventListener(
"load",
function () {
window.addEventListener("load", contentLoaded, false);
window.addEventListener("message", (event) => {
if ('updateContent' == event?.data?.type) {
contentLoaded();
},
false
);
}
}, false);