search plugin
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Jon Snyder
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98a99086ac
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/*
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* Handles finding a text string anywhere in the slides and showing the next occurrence to the user
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* by navigatating to that slide and highlighting it.
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*
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* By Jon Snyder <snyder.jon@gmail.com>, February 2013
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*/
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var RevealSearch = (function() {
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var matchedSlides;
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var currentMatchedIndex;
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var searchboxDirty;
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var myHilitor;
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// Original JavaScript code by Chirp Internet: www.chirp.com.au
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// Please acknowledge use of this code by including this header.
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// 2/2013 jon: modified regex to display any match, not restricted to word boundaries.
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function Hilitor(id, tag)
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{
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var targetNode = document.getElementById(id) || document.body;
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var hiliteTag = tag || "EM";
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var skipTags = new RegExp("^(?:" + hiliteTag + "|SCRIPT|FORM|SPAN)$");
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var colors = ["#ff6", "#a0ffff", "#9f9", "#f99", "#f6f"];
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var wordColor = [];
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var colorIdx = 0;
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var matchRegex = "";
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var matchingSlides = [];
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this.setRegex = function(input)
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{
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input = input.replace(/^[^\w]+|[^\w]+$/g, "").replace(/[^\w'-]+/g, "|");
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matchRegex = new RegExp("(" + input + ")","i");
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}
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this.getRegex = function()
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{
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return matchRegex.toString().replace(/^\/\\b\(|\)\\b\/i$/g, "").replace(/\|/g, " ");
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}
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// recursively apply word highlighting
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this.hiliteWords = function(node)
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{
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if(node == undefined || !node) return;
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if(!matchRegex) return;
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if(skipTags.test(node.nodeName)) return;
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if(node.hasChildNodes()) {
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for(var i=0; i < node.childNodes.length; i++)
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this.hiliteWords(node.childNodes[i]);
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}
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if(node.nodeType == 3) { // NODE_TEXT
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if((nv = node.nodeValue) && (regs = matchRegex.exec(nv))) {
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//find the slide's section element and save it in our list of matching slides
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var secnode = node.parentNode;
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while (secnode.nodeName != 'SECTION') {
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secnode = secnode.parentNode;
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}
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var slideIndex = Reveal.getIndices(secnode);
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var slidelen = matchingSlides.length;
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var alreadyAdded = false;
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for (var i=0; i < slidelen; i++) {
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if ( (matchingSlides[i].h === slideIndex.h) && (matchingSlides[i].v === slideIndex.v) ) {
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alreadyAdded = true;
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}
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}
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if (! alreadyAdded) {
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matchingSlides.push(slideIndex);
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}
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if(!wordColor[regs[0].toLowerCase()]) {
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wordColor[regs[0].toLowerCase()] = colors[colorIdx++ % colors.length];
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}
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var match = document.createElement(hiliteTag);
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match.appendChild(document.createTextNode(regs[0]));
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match.style.backgroundColor = wordColor[regs[0].toLowerCase()];
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match.style.fontStyle = "inherit";
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match.style.color = "#000";
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var after = node.splitText(regs.index);
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after.nodeValue = after.nodeValue.substring(regs[0].length);
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node.parentNode.insertBefore(match, after);
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}
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}
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};
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// remove highlighting
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this.remove = function()
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{
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var arr = document.getElementsByTagName(hiliteTag);
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while(arr.length && (el = arr[0])) {
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el.parentNode.replaceChild(el.firstChild, el);
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}
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};
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// start highlighting at target node
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this.apply = function(input)
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{
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if(input == undefined || !input) return;
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this.remove();
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this.setRegex(input);
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this.hiliteWords(targetNode);
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return matchingSlides;
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};
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}
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function openSearch() {
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//ensure the search term input dialog is visible and has focus:
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var inputbox = document.getElementById("searchinput");
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inputbox.style.display = "inline";
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inputbox.focus();
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inputbox.select();
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}
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function toggleSearch() {
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var inputbox = document.getElementById("searchinput");
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if (inputbox.style.display !== "inline") {
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openSearch();
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}
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else {
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inputbox.style.display = "none";
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myHilitor.remove();
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}
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}
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function doSearch() {
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//if there's been a change in the search term, perform a new search:
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if (searchboxDirty) {
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var searchstring = document.getElementById("searchinput").value;
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//find the keyword amongst the slides
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myHilitor = new Hilitor("slidecontent");
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matchedSlides = myHilitor.apply(searchstring);
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currentMatchedIndex = 0;
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}
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//navigate to the next slide that has the keyword, wrapping to the first if necessary
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if (matchedSlides.length && (matchedSlides.length <= currentMatchedIndex)) {
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currentMatchedIndex = 0;
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}
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if (matchedSlides.length > currentMatchedIndex) {
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Reveal.slide(matchedSlides[currentMatchedIndex].h, matchedSlides[currentMatchedIndex].v);
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currentMatchedIndex++;
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}
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}
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var dom = {};
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dom.wrapper = document.querySelector( '.reveal' );
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if( !dom.wrapper.querySelector( '.searchbox' ) ) {
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var searchElement = document.createElement( 'div' );
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searchElement.id = "searchinputdiv";
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searchElement.classList.add( 'searchdiv' );
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searchElement.innerHTML = '<span><input type="text" id="searchinput" class="searchinput"/><img src="css/theme/assets/searchicon.png" id="searchbutton" class="searchicon"/></span>';
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dom.wrapper.appendChild( searchElement );
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}
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document.getElementById("searchbutton").addEventListener( 'click', function(event) {
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toggleSearch();
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}, false );
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document.getElementById("searchinput").addEventListener( 'keyup', function( event ) {
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switch (event.keyCode) {
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case 13:
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event.preventDefault();
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doSearch();
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searchboxDirty = false;
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break;
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default:
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searchboxDirty = true;
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}
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}, false );
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// Open the search when the 's' key is hit (yes, this conflicts with the notes plugin, disabling for now)
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/*
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document.addEventListener( 'keydown', function( event ) {
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// Disregard the event if the target is editable or a
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// modifier is present
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if ( document.querySelector( ':focus' ) !== null || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
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if( event.keyCode === 83 ) {
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event.preventDefault();
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openSearch();
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}
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}, false );
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*/
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return { open: openSearch };
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})();
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