balancetext.min.js

(function(root,factory){if(typeof define==="function"&&define.amd){define([],factory)}else if(typeof module==="object"&&module.exports){module.exports=factory()}else{root.balanceText=factory()}})(this,()=>{let breakMatches,wsnwMatches,wsnwOffset;const watching={sel:[],el:[]};let handlersInitialized=false;let polyfilled=false;function noop(){}function forEach(elements,callback){Array.prototype.forEach.call(elements,callback)}function ready(fn){if(document.readyState!=="loading"){fn()}else if(document.addEventListener){document.addEventListener("DOMContentLoaded",fn)}else{document.attachEvent("onreadystatechange",()=>{if(document.readyState!=="loading"){fn()}})}}function debounce(func,threshold,execAsap,...args){let timeout;return function(){const obj=this;function delayed(){if(!execAsap){func.apply(obj,args)}timeout=null}if(timeout){clearTimeout(timeout)}else if(execAsap){func.apply(obj,args)}timeout=setTimeout(delayed,threshold||100)}}function hasTextWrap(){if(typeof window==="undefined"){return false}const{style:style}=document.documentElement;return style.textWrap||style.WebkitTextWrap||style.MozTextWrap||style.MsTextWrap}function NextWS_params(){this.reset()}NextWS_params.prototype.reset=function(){this.index=0;this.width=0};function isWhiteSpaceNoWrap(index){return wsnwMatches.some(range=>range.start<index&&index<range.end)}function recursiveCalcNoWrapOffsetsForLine(el,includeTag){if(el.nodeType===el.ELEMENT_NODE){const style=window.getComputedStyle(el);if(style.whiteSpace==="nowrap"){const len=el.outerHTML.length;wsnwMatches.push({start:wsnwOffset,end:wsnwOffset+len});wsnwOffset+=len}else{forEach(el.childNodes,child=>{recursiveCalcNoWrapOffsetsForLine(child,true)});if(includeTag){wsnwOffset+=el.outerHTML.length-el.innerHTML.length}}}else if(el.nodeType===el.COMMENT_NODE){wsnwOffset+=el.length+7}else if(el.nodeType===el.PROCESSING_INSTRUCTION_NODE){wsnwOffset+=el.length+2}else{wsnwOffset+=el.length}}function calcNoWrapOffsetsForLine(el,oldWS,lineCharOffset){if(lineCharOffset===0){el.style.whiteSpace=oldWS;wsnwOffset=0;wsnwMatches=[];recursiveCalcNoWrapOffsetsForLine(el,false);el.style.whiteSpace="nowrap"}else{const newMatches=[];wsnwMatches.forEach(match=>{if(match.start>lineCharOffset){newMatches.push({start:match.start-lineCharOffset,end:match.end-lineCharOffset})}});wsnwMatches=newMatches}}function removeTags(el){let brs=el.querySelectorAll('br[data-owner="balance-text-hyphen"]');forEach(brs,br=>{br.outerHTML=""});brs=el.querySelectorAll('br[data-owner="balance-text"]');forEach(brs,br=>{br.outerHTML=" "});let spans=el.querySelectorAll('span[data-owner="balance-text-softhyphen"]');if(spans.length>0){forEach(spans,span=>{const textNode=document.createTextNode("­");span.parentNode.insertBefore(textNode,span);span.parentNode.removeChild(span)})}spans=el.querySelectorAll('span[data-owner="balance-text-justify"]');if(spans.length>0){let txt="";forEach(spans,span=>{txt+=span.textContent;span.parentNode.removeChild(span)});el.innerHTML=txt}}const isJustified=function(el){const style=el.currentStyle||window.getComputedStyle(el,null);return style.textAlign==="justify"};function justify(el,txt,conWidth){txt=txt.trim();const words=txt.split(" ").length;txt=`${txt} `;if(words<2){return txt}const tmp=document.createElement("span");tmp.innerHTML=txt;el.appendChild(tmp);const size=tmp.offsetWidth;tmp.parentNode.removeChild(tmp);const wordSpacing=Math.floor((conWidth-size)/(words-1));tmp.style.wordSpacing=`${wordSpacing}px`;tmp.setAttribute("data-owner","balance-text-justify");const div=document.createElement("div");div.appendChild(tmp);return div.innerHTML}function isBreakChar(txt,index){const re=/([^\S\u00a0]|-|\u2014|\u2013|\u00ad)(?![^<]*>)/g;let match;if(!breakMatches){breakMatches=[];match=re.exec(txt);while(match!==null){if(!isWhiteSpaceNoWrap(match.index)){breakMatches.push(match.index)}match=re.exec(txt)}}return breakMatches.indexOf(index)!==-1}function isBreakOpportunity(txt,index){return index===0||index===txt.length||isBreakChar(txt,index-1)&&!isBreakChar(txt,index)}function findBreakOpportunity(el,txt,conWidth,desWidth,dir,c,ret){let w;if(txt&&typeof txt==="string"){for(;;){while(!isBreakOpportunity(txt,c)){c+=dir}el.innerHTML=txt.substr(0,c);w=el.offsetWidth;if(dir<0){if(w<=desWidth||w<=0||c===0){break}}else if(desWidth<=w||conWidth<=w||c===txt.length){break}c+=dir}}ret.index=c;ret.width=w}function getSpaceWidth(el,h){const container=document.createElement("div");container.style.display="block";container.style.position="absolute";container.style.bottom=0;container.style.right=0;container.style.width=0;container.style.height=0;container.style.margin=0;container.style.padding=0;container.style.visibility="hidden";container.style.overflow="hidden";const space=document.createElement("span");space.style.fontSize="2000px";space.innerHTML="&nbsp;";container.appendChild(space);el.appendChild(container);const dims=space.getBoundingClientRect();container.parentNode.removeChild(container);const spaceRatio=dims.height/dims.width;return h/spaceRatio}function getElementsList(elements){if(!elements){return[]}if(typeof elements==="string"){return document.querySelectorAll(elements)}if(elements.tagName&&elements.querySelectorAll){return[elements]}return elements}function balanceText(elements){forEach(getElementsList(elements),el=>{const maxTextWidth=5e3;removeTags(el);const oldWS=el.style.whiteSpace;const oldFloat=el.style.float;const oldDisplay=el.style.display;const oldPosition=el.style.position;const oldLH=el.style.lineHeight;el.style.lineHeight="normal";const containerWidth=el.offsetWidth;const containerHeight=el.offsetHeight;el.style.whiteSpace="nowrap";el.style.float="none";el.style.display="inline";el.style.position="static";let nowrapWidth=el.offsetWidth;const nowrapHeight=el.offsetHeight;const spaceWidth=oldWS==="pre-wrap"?0:getSpaceWidth(el,nowrapHeight);if(containerWidth>0&&nowrapWidth>containerWidth&&nowrapWidth<maxTextWidth){let remainingText=el.innerHTML;let newText="";let lineText="";const shouldJustify=isJustified(el);const totLines=Math.round(containerHeight/nowrapHeight);let remLines=totLines;let lineCharOffset=0;let desiredWidth,guessIndex,le,ge,splitIndex,isHyphen,isSoftHyphen;while(remLines>1){breakMatches=null;calcNoWrapOffsetsForLine(el,oldWS,lineCharOffset);desiredWidth=Math.round((nowrapWidth+spaceWidth)/remLines-spaceWidth);guessIndex=Math.round((remainingText.length+1)/remLines)-1;le=new NextWS_params;findBreakOpportunity(el,remainingText,containerWidth,desiredWidth,-1,guessIndex,le);ge=new NextWS_params;guessIndex=le.index;findBreakOpportunity(el,remainingText,containerWidth,desiredWidth,+1,guessIndex,ge);le.reset();guessIndex=ge.index;findBreakOpportunity(el,remainingText,containerWidth,desiredWidth,-1,guessIndex,le);if(le.index===0){splitIndex=ge.index}else if(containerWidth<ge.width||le.index===ge.index){splitIndex=le.index}else{splitIndex=Math.abs(desiredWidth-le.width)<Math.abs(ge.width-desiredWidth)?le.index:ge.index}lineText=remainingText.substr(0,splitIndex).replace(/\s$/,"");isSoftHyphen=Boolean(lineText.match(/\u00ad$/));if(isSoftHyphen){lineText=lineText.replace(/\u00ad$/,'<span data-owner="balance-text-softhyphen">-</span>')}if(shouldJustify){newText+=justify(el,lineText,containerWidth)}else{newText+=lineText;isHyphen=isSoftHyphen||Boolean(lineText.match(/(-|\u2014|\u2013)$/));newText+=isHyphen?'<br data-owner="balance-text-hyphen" />':'<br data-owner="balance-text" aria-hidden="true" />'}remainingText=remainingText.substr(splitIndex);lineCharOffset=splitIndex;remLines--;el.innerHTML=remainingText;nowrapWidth=el.offsetWidth}if(shouldJustify){el.innerHTML=newText+justify(el,remainingText,containerWidth)}else{el.innerHTML=newText+remainingText}}el.style.whiteSpace=oldWS;el.style.float=oldFloat;el.style.display=oldDisplay;el.style.position=oldPosition;el.style.lineHeight=oldLH})}function updateWatched(){const selectors=watching.sel.join(",");const selectedElements=getElementsList(selectors);const elements=Array.prototype.concat.apply(watching.el,selectedElements);balanceText(elements)}function initHandlers(){if(handlersInitialized){return}ready(updateWatched);window.addEventListener("load",updateWatched);window.addEventListener("resize",debounce(updateWatched));handlersInitialized=true}function balanceTextAndWatch(elements){if(typeof elements==="string"){watching.sel.push(elements)}else{forEach(getElementsList(elements),el=>{watching.el.push(el)})}initHandlers();updateWatched()}function unwatch(elements){if(typeof elements==="string"){watching.sel=watching.sel.filter(el=>el!==elements)}else{elements=getElementsList(elements);watching.el=watching.el.filter(el=>elements.indexOf(el)===-1)}}function polyfill(){if(polyfilled){return}watching.sel.push(".balance-text");initHandlers();polyfilled=true}function publicInterface(elements,options){if(!elements){polyfill()}else if(options&&options.watch===true){balanceTextAndWatch(elements)}else if(options&&options.watch===false){unwatch(elements)}else{balanceText(elements)}}publicInterface.updateWatched=updateWatched;if(hasTextWrap()){noop.updateWatched=noop;return noop}return publicInterface});