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mermaid: lazy render graph if it is initially hidden #187

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works now in initially collapsed expands and initially inactive tabs
This commit is contained in:
Sören Weber 2023-08-26 01:26:37 +02:00
parent 80a7528179
commit 0dd4b34023
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GPG key ID: BEC6D55545451B6D
2 changed files with 24 additions and 9 deletions
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4
exampleSite/content/shortcodes/mermaid.en.md
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@ -15,10 +15,6 @@ graph LR;
This only works in modern browsers.
{{% /notice %}}
{{% notice warning %}}
Due to limitations with [Mermaid](https://github.com/mermaid-js/mermaid/issues/1846), it is currently not possible to use Mermaid code fences in an initially collapsed `expand` shortcode. This is a know issue and [can't be fixed by this theme](https://github.com/McShelby/hugo-theme-relearn/issues/187).
{{% /notice %}}
## Usage
While the examples are using shortcodes with named parameter it is recommended to use codefences instead. This is because more and more other software supports Mermaid codefences (eg. GitHub) and so your markdown becomes more portable.

29
static/js/theme.js
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@ -114,6 +114,8 @@ function switchTab(tabGroup, tabId) {
allTabItems && allTabItems.forEach( function( e ){ e.classList.remove( 'active' ); });
targetTabItems && targetTabItems.forEach( function( e ){ e.classList.add( 'active' ); });
initMermaid( true );
if(isButtonEvent){
// reset screen to the same position relative to clicked button to prevent page jump
var yposButtonDiff = event.target.getBoundingClientRect().top - yposButton;
@ -209,6 +211,9 @@ function initMermaid( update, attrs ) {
var graph = serializeGraph( parse );
element.innerHTML = graph;
if( element.offsetParent !== null ){
element.classList.add( 'mermaid-render' );
}
var new_element = document.createElement( 'div' );
new_element.classList.add( 'mermaid-container' );
new_element.innerHTML = '<div class="mermaid-code">' + graph + '</div>' + element.outerHTML;
@ -225,10 +230,19 @@ function initMermaid( update, attrs ) {
var code = e.querySelector( '.mermaid-code' );
var parse = parseGraph( decodeHTML( code.innerHTML ) );
if( parse.yaml.relearn_user_theme || parse.dir.relearn_user_theme ){
return;
if( element.classList.contains( 'mermaid-render' ) ){
if( parse.yaml.relearn_user_theme || parse.dir.relearn_user_theme ){
return;
}
if( parse.yaml.theme == theme || parse.dir.theme == theme ){
return;
}
}
if( parse.yaml.theme == theme || parse.dir.theme == theme ){
if( element.offsetParent !== null ){
element.classList.add( 'mermaid-render' );
}
else{
element.classList.remove( 'mermaid-render' );
return;
}
is_initialized = true;
@ -292,7 +306,7 @@ function initMermaid( update, attrs ) {
svg.call( zoom );
});
},
querySelector: '.mermaid',
querySelector: '.mermaid.mermaid-render',
suppressErrors: true
});
}
@ -987,7 +1001,11 @@ function initSwipeHandler(){
}
function initImage(){
document.querySelectorAll( '.lightbox-back' ).forEach( function(e){ e.addEventListener("keydown", imageEscapeHandler); }, false);
document.querySelectorAll( '.lightbox-back' ).forEach( function(e){ e.addEventListener( 'keydown', imageEscapeHandler ); });
}
function initExpand(){
document.querySelectorAll( '.expand > input' ).forEach( function(e){ e.addEventListener( 'change', initMermaid.bind( null, true, null ) ); });
}
function clearHistory() {
@ -1355,6 +1373,7 @@ ready( function(){
initHistory();
initSearch();
initImage();
initExpand();
initScrollPositionSaver();
scrollToPositions();
});