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Diffstat (limited to 'present/plugin/search/plugin.js')
| -rw-r--r-- | present/plugin/search/plugin.js | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/present/plugin/search/plugin.js b/present/plugin/search/plugin.js new file mode 100644 index 0000000..5d09ce6 --- /dev/null +++ b/present/plugin/search/plugin.js @@ -0,0 +1,243 @@ +/*! + * Handles finding a text string anywhere in the slides and showing the next occurrence to the user + * by navigatating to that slide and highlighting it. + * + * @author Jon Snyder <snyder.jon@gmail.com>, February 2013 + */ + +const Plugin = () => { + + // The reveal.js instance this plugin is attached to + let deck; + + let searchElement; + let searchButton; + let searchInput; + + let matchedSlides; + let currentMatchedIndex; + let searchboxDirty; + let hilitor; + + function render() { + + searchElement = document.createElement( 'div' ); + searchElement.classList.add( 'searchbox' ); + searchElement.style.position = 'absolute'; + searchElement.style.top = '10px'; + searchElement.style.right = '10px'; + searchElement.style.zIndex = 10; + + //embedded base64 search icon Designed by Sketchdock - http://www.sketchdock.com/: + searchElement.innerHTML = `<input type="search" class="searchinput" placeholder="Search..." style="vertical-align: top;"/> + </span>`; + + searchInput = searchElement.querySelector( '.searchinput' ); + searchInput.style.width = '240px'; + searchInput.style.fontSize = '14px'; + searchInput.style.padding = '4px 6px'; + searchInput.style.color = '#000'; + searchInput.style.background = '#fff'; + searchInput.style.borderRadius = '2px'; + searchInput.style.border = '0'; + searchInput.style.outline = '0'; + searchInput.style.boxShadow = '0 2px 18px rgba(0, 0, 0, 0.2)'; + searchInput.style['-webkit-appearance'] = 'none'; + + deck.getRevealElement().appendChild( searchElement ); + + // searchButton.addEventListener( 'click', function(event) { + // doSearch(); + // }, false ); + + searchInput.addEventListener( 'keyup', function( event ) { + switch (event.keyCode) { + case 13: + event.preventDefault(); + doSearch(); + searchboxDirty = false; + break; + default: + searchboxDirty = true; + } + }, false ); + + closeSearch(); + + } + + function openSearch() { + if( !searchElement ) render(); + + searchElement.style.display = 'inline'; + searchInput.focus(); + searchInput.select(); + } + + function closeSearch() { + if( !searchElement ) render(); + + searchElement.style.display = 'none'; + if(hilitor) hilitor.remove(); + } + + function toggleSearch() { + if( !searchElement ) render(); + + if (searchElement.style.display !== 'inline') { + openSearch(); + } + else { + closeSearch(); + } + } + + function doSearch() { + //if there's been a change in the search term, perform a new search: + if (searchboxDirty) { + var searchstring = searchInput.value; + + if (searchstring === '') { + if(hilitor) hilitor.remove(); + matchedSlides = null; + } + else { + //find the keyword amongst the slides + hilitor = new Hilitor("slidecontent"); + matchedSlides = hilitor.apply(searchstring); + currentMatchedIndex = 0; + } + } + + if (matchedSlides) { + //navigate to the next slide that has the keyword, wrapping to the first if necessary + if (matchedSlides.length && (matchedSlides.length <= currentMatchedIndex)) { + currentMatchedIndex = 0; + } + if (matchedSlides.length > currentMatchedIndex) { + deck.slide(matchedSlides[currentMatchedIndex].h, matchedSlides[currentMatchedIndex].v); + currentMatchedIndex++; + } + } + } + + // Original JavaScript code by Chirp Internet: www.chirp.com.au + // Please acknowledge use of this code by including this header. + // 2/2013 jon: modified regex to display any match, not restricted to word boundaries. + function Hilitor(id, tag) { + + var targetNode = document.getElementById(id) || document.body; + var hiliteTag = tag || "EM"; + var skipTags = new RegExp("^(?:" + hiliteTag + "|SCRIPT|FORM)$"); + var colors = ["#ff6", "#a0ffff", "#9f9", "#f99", "#f6f"]; + var wordColor = []; + var colorIdx = 0; + var matchRegex = ""; + var matchingSlides = []; + + this.setRegex = function(input) + { + input = input.replace(/^[^\w]+|[^\w]+$/g, "").replace(/[^\w'-]+/g, "|"); + matchRegex = new RegExp("(" + input + ")","i"); + } + + this.getRegex = function() + { + return matchRegex.toString().replace(/^\/\\b\(|\)\\b\/i$/g, "").replace(/\|/g, " "); + } + + // recursively apply word highlighting + this.hiliteWords = function(node) + { + if(node == undefined || !node) return; + if(!matchRegex) return; + if(skipTags.test(node.nodeName)) return; + + if(node.hasChildNodes()) { + for(var i=0; i < node.childNodes.length; i++) + this.hiliteWords(node.childNodes[i]); + } + if(node.nodeType == 3) { // NODE_TEXT + var nv, regs; + if((nv = node.nodeValue) && (regs = matchRegex.exec(nv))) { + //find the slide's section element and save it in our list of matching slides + var secnode = node; + while (secnode != null && secnode.nodeName != 'SECTION') { + secnode = secnode.parentNode; + } + + var slideIndex = deck.getIndices(secnode); + var slidelen = matchingSlides.length; + var alreadyAdded = false; + for (var i=0; i < slidelen; i++) { + if ( (matchingSlides[i].h === slideIndex.h) && (matchingSlides[i].v === slideIndex.v) ) { + alreadyAdded = true; + } + } + if (! alreadyAdded) { + matchingSlides.push(slideIndex); + } + + if(!wordColor[regs[0].toLowerCase()]) { + wordColor[regs[0].toLowerCase()] = colors[colorIdx++ % colors.length]; + } + + var match = document.createElement(hiliteTag); + match.appendChild(document.createTextNode(regs[0])); + match.style.backgroundColor = wordColor[regs[0].toLowerCase()]; + match.style.fontStyle = "inherit"; + match.style.color = "#000"; + + var after = node.splitText(regs.index); + after.nodeValue = after.nodeValue.substring(regs[0].length); + node.parentNode.insertBefore(match, after); + } + } + }; + + // remove highlighting + this.remove = function() + { + var arr = document.getElementsByTagName(hiliteTag); + var el; + while(arr.length && (el = arr[0])) { + el.parentNode.replaceChild(el.firstChild, el); + } + }; + + // start highlighting at target node + this.apply = function(input) + { + if(input == undefined || !input) return; + this.remove(); + this.setRegex(input); + this.hiliteWords(targetNode); + return matchingSlides; + }; + + } + + return { + + id: 'search', + + init: reveal => { + + deck = reveal; + deck.registerKeyboardShortcut( 'CTRL + Shift + F', 'Search' ); + + document.addEventListener( 'keydown', function( event ) { + if( event.key == "F" && (event.ctrlKey || event.metaKey) ) { //Control+Shift+f + event.preventDefault(); + toggleSearch(); + } + }, false ); + + }, + + open: openSearch + + } +}; + +export default Plugin;
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