94 lines
2.7 KiB
JavaScript
94 lines
2.7 KiB
JavaScript
/**
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* reveal-header
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* A filter that adds header text and logo.
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*
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* MIT License
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* Copyright (c) 2023 Shafayet Khan Shafee.
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*/
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function add_sc_sb_title() {
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function get_title() {
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var h1_arr = [];
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var h2_arr = [];
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Reveal.getSlides().forEach(el => {
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if (!el.matches('#title-slide')) {
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var h1 = el.querySelector('.title-slide h1')?.innerText;
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var h2 = el.querySelector('.title-slide h2')?.innerText;
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h1_arr.push(h1);
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h2_arr.push(h2);
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};
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});
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return [h1_arr, h2_arr]
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};
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function fill_array(ar) {
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let last_val = ar[0] || " ";
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for (let i = 1; i < ar.length; i++) {
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if (typeof ar[i] === 'undefined') {
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ar[i] = last_val;
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} else {
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last_val = ar[i];
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}
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}
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return ar
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};
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if (Reveal.isReady()) {
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if (document.querySelector('div.reveal-header img').getAttribute('src').length == 0) {
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document.querySelector('div.reveal-header').classList.add('no-logo')
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}
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var [h1_array, h2_array] = get_title();
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var filled_h1_array = fill_array(h1_array);
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var filled_h2_array = fill_array(h2_array);
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Reveal.getSlides().forEach((el, idx) => {
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if (!el.matches('#title-slide')) {
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el.setAttribute('data-sc-title', filled_h1_array[(idx - 1)])
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el.setAttribute('data-sb-title', filled_h2_array[(idx - 1)])
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}
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});
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Reveal.on( 'slidechanged', event => {
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let sp = Reveal.getSlidesElement().querySelector('.stack.present');
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if (sp != null) {
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let header = document.querySelector("div.reveal-header");
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// handling h1 section title (`.sc-title`)
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var section_text = event.currentSlide.getAttribute('data-sc-title') || " ";
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if (event.currentSlide.matches('.title-slide.level1')) {
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header.querySelector('.sc-title p').innerText = "";
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} else if (event.currentSlide.matches('.title-slide.level2')) {
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header.querySelector('.sc-title p').innerText = section_text;
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} else {
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header.querySelector('.sc-title p').innerText = section_text;
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};
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// handling h2 section title (`.sb-title`)
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var sbsection_text = event.currentSlide.getAttribute('data-sb-title') || " ";
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if (event.currentSlide.matches('.title-slide.level1')) {
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header.querySelector('.sb-title p').innerText = "";
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} else if (event.currentSlide.matches('.title-slide.level2')) {
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header.querySelector('.sb-title p').innerText = "";
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} else {
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header.querySelector('.sb-title p').innerText = sbsection_text;
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};
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};
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});
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};
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};
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window.addEventListener("load", (event) => {
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add_sc_sb_title();
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});
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