presentations

search.js (7181B)

---

 /*
  * 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.
  *
  * By Jon Snyder <snyder.jon@gmail.com>, February 2013
  */
 
 var RevealSearch = (function() {
 
 	var matchedSlides;
 	var currentMatchedIndex;
 	var searchboxDirty;
 	var myHilitor;
 
 // 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
 			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 = Reveal.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);
 		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;
 	};
 
 }
 
 	function openSearch() {
 		//ensure the search term input dialog is visible and has focus:
 		var inputboxdiv = document.getElementById("searchinputdiv");
 		var inputbox = document.getElementById("searchinput");
 		inputboxdiv.style.display = "inline";
 		inputbox.focus();
 		inputbox.select();
 	}
 
 	function closeSearch() {
 		var inputboxdiv = document.getElementById("searchinputdiv");
 		inputboxdiv.style.display = "none";
 		if(myHilitor) myHilitor.remove();
 	}
 
 	function toggleSearch() {
 		var inputboxdiv = document.getElementById("searchinputdiv");
 		if (inputboxdiv.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 = document.getElementById("searchinput").value;
 
 			if (searchstring === '') {
 				if(myHilitor) myHilitor.remove();
 				matchedSlides = null;
 			}
 			else {
 				//find the keyword amongst the slides
 				myHilitor = new Hilitor("slidecontent");
 				matchedSlides = myHilitor.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) {
 				Reveal.slide(matchedSlides[currentMatchedIndex].h, matchedSlides[currentMatchedIndex].v);
 				currentMatchedIndex++;
 			}
 		}
 	}
 
 	var dom = {};
 	dom.wrapper = document.querySelector( '.reveal' );
 
 	if( !dom.wrapper.querySelector( '.searchbox' ) ) {
 			var searchElement = document.createElement( 'div' );
 			searchElement.id = "searchinputdiv";
 			searchElement.classList.add( 'searchdiv' );
 			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 = '<span><input type="search" id="searchinput" class="searchinput" style="vertical-align: top;"/><img src="data:image/png;base64,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" id="searchbutton" class="searchicon" style="vertical-align: top; margin-top: -1px;"/></span>';
 			dom.wrapper.appendChild( searchElement );
 	}
 
 	document.getElementById( 'searchbutton' ).addEventListener( 'click', function(event) {
 		doSearch();
 	}, false );
 
 	document.getElementById( 'searchinput' ).addEventListener( 'keyup', function( event ) {
 		switch (event.keyCode) {
 			case 13:
 				event.preventDefault();
 				doSearch();
 				searchboxDirty = false;
 				break;
 			default:
 				searchboxDirty = true;
 		}
 	}, false );
 
 	document.addEventListener( 'keydown', function( event ) {
 		if( event.key == "F" && (event.ctrlKey || event.metaKey) ) { //Control+Shift+f
 			event.preventDefault();
 			toggleSearch();
 		}
 	}, false );
 	if( window.Reveal ) Reveal.registerKeyboardShortcut( 'CTRL + Shift + F', 'Search' );
 	closeSearch();
 	return { open: openSearch };
 })();