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Add print cycle events and loading msg

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Since the print cycle now loads all images not-yet-loaded (due to lazy loading), there can be a moment of time where it appears pressing Get PDF is doing nothing, depending on connection speed.  To add a "loading" message, a custom event is fired at the start and end of the print cycle (before the print dialog comes up).
This commit is contained in:
Gazook89
2026-04-30 21:05:08 -05:00
parent d04f401c90
commit 9af2577c6e
2 changed files with 41 additions and 18 deletions
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shared/helpers.js
+23 -16
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@@ -107,26 +107,33 @@ const splitTextStyleAndMetadata = (brew)=>{
const printCurrentBrew = async ()=>{
if(window.typeof !== 'undefined') {
const iframeDoc = window.frames['BrewRenderer'].contentDocument;
// fire a custom event for the print cycle
document.dispatchEvent(new CustomEvent('print:startprep'));
try {
const iframeDoc = window.frames['BrewRenderer'].contentDocument;
// get all img elements with lazy loading (currently only elements generated through MarkedJS)
const lazyImages = [...iframeDoc.querySelectorAll('img[loading="lazy"]')];
lazyImages.forEach((img)=>{ img.loading = 'eager'; });
// get all img elements with lazy loading (currently only elements generated through MarkedJS)
const lazyImages = [...iframeDoc.querySelectorAll('img[loading="lazy"]')];
lazyImages.forEach((img)=>{ img.loading = 'eager'; });
// waits for images to load before resolving promise and opening print dialog
await Promise.all(
lazyImages
.filter((img)=>!img.complete)
.map((img)=>new Promise((resolve)=>{ img.onload = resolve; img.onerror = resolve; }))
);
// waits for images to load before resolving promise and opening print dialog
await Promise.all(
lazyImages
.filter((img)=>!img.complete)
.map((img)=>new Promise((resolve)=>{ img.onload = resolve; img.onerror = resolve; }))
);
window.frames['BrewRenderer'].contentWindow.print();
window.frames['BrewRenderer'].contentWindow.print();
//Force DOM reflow; Print dialog causes a repaint, and @media print CSS somehow makes out-of-view pages disappear
const node = iframeDoc.getElementsByClassName('brewRenderer').item(0);
node.style.display='none';
node.offsetHeight; // accessing this is enough to trigger a reflow
node.style.display='';
//Force DOM reflow; Print dialog causes a repaint, and @media print CSS somehow makes out-of-view pages disappear
const node = iframeDoc.getElementsByClassName('brewRenderer').item(0);
node.style.display='none';
node.offsetHeight; // accessing this is enough to trigger a reflow
node.style.display='';
} finally {
// when lazy load images have all been loaded, and the doc re-rendered for print preview, emit 'finished' event.
document.dispatchEvent(new CustomEvent('print:finishedprep'));
}
}
};