How to split text into separate pages (like google docs) in contenteditable?

Question

I am working on a specialized browser-based text editor. I have a question that put me in a daze. How to define and split long text into separate pages, as is done in Google docs? I know google docs does not work through contenteditable, but there must be some solution ...

Edit1: We need to consider several scenarios:

• We load the document using a json object, and then provide our pages.
• We print the text and get to the end of the page.
• We delete the text.
• We insert or delete a piece of text.

https://googleblog.blogspot.ru/2011/04/pagination-comes-to-google-docs.html

page.html

<div class="box-base"> <div id="page-1" class="page"> <div id="editable-1" class="document" contenteditable="true"></div> </div> <div id="page-2" class="page"> <div id="editable-2" class="document" contenteditable="true"></div> </div> </div> 

styles.css

 .box-base { margin-left: 50px; flex: 1 0 430px; border-style: solid; display: -webkit-flex; display: flex; flex-wrap: wrap; justify-content: center; height: 900px; overflow: auto; } .page { width: @page-width; height: @page-width * 1.414; /*overflow-y: auto;*/ background: white; margin: 25px 0 25px 0; } .document { /*max-height: 1000px;*/ overflow: hidden; } 

Answer 1

I think you need to try to split the text in different places and watch until scrollHeight is less than or equal to clientHeight. Sort of:

 var divs = document.querySelectorAll('div'); var div = divs[0] // Get text from content of first div - this wouldn't be what real code used var text = div.textContent; // Guess the split point as a percentage of the hidden characters var splitPoint = text.length * div.clientHeight / div.scrollHeight; // Find first space after splitpoint splitPoint = text.indexOf(' ', splitPoint); // Used to make sure we don't get into an infinite loop. Not needed if this code is proven to work on all browsers. var count = 0; div.textContent = text.substr(0, splitPoint); // Add words until we are bigger while ((div.clientHeight == div.scrollHeight) && (count++ < 1000)) { splitPoint = text.indexOf(' ', splitPoint + 1); div.textContent = text.substr(0,splitPoint); } // Subtract words until we are smaller while ((div.clientHeight < div.scrollHeight) && (count++ < 1000)) { splitPoint = text.lastIndexOf(' ', splitPoint - 1); div.textContent = text.substr(0, splitPoint); } divs[1].textContent = text.substr(splitPoint); // Create new divs starting at splitpoint (left as an exercise) 

 div.box { width: 150px; height: 150px; border: 1px solid black; } div.moretext { background: #ccc; } 

 <div class="box">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent viverra malesuada nibh, sed luctus eros egestas in. Donec imperdiet, purus a consequat ultricies, mauris magna laoreet neque, quis tincidunt risus augue in lorem. Donec mauris odio, vehicula eget sollicitudin sed, aliquet et metus. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec condimentum sed lacus at porttitor. Suspendisse tincidunt vehicula mauris, a ultricies mi fringilla et. Aliquam eget imperdiet magna. Quisque justo libero, commodo vitae dolor quis, volutpat consectetur tellus. Nullam consectetur commodo sem vel posuere. Praesent nec suscipit sem, quis porta diam. Duis gravida lectus fringilla, efficitur quam ut, luctus sem. Ut elit tortor, bibendum a molestie vel, tincidunt vitae lacus. In dapibus commodo mi, id blandit velit mollis placerat. Praesent quis posuere ligula. Praesent ac rhoncus est. In blandit non justo ut egestas. Praesent nec mi sagittis, eleifend nisl ac, egestas enim. Aliquam in tortor ac tellus rutrum feugiat. Etiam bibendum eget metus eget facilisis. Sed mollis eget tellus at viverra. Fusce at leo vel magna convallis dictum. Sed convallis ipsum non feugiat sagittis. Donec a lacus nisl. Donec elementum metus nec arcu interdum interdum. Praesent malesuada eu purus nec tempus. Aliquam in velit nulla. Ut vel turpis et sapien consectetur facilisis. Fusce a pulvinar lorem. Vestibulum vel neque vitae arcu placerat sodales quis ut risus. Cras aliquet, nibh quis sodales venenatis, felis est tempus enim, at condimentum felis nulla sollicitudin tortor. Morbi viverra dolor tempus, lacinia ante ac, dapibus diam. Suspendisse nec ligula viverra, pellentesque lacus nec, maximus turpis.</div> <div class="moretext"></div>