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Offline Text Editor in < 140 bytes (115 bytes). Powered by localStorage & contentEditable
with({
l: localStorage // Alias for localStorage, where we'll store text content
}) with(document.body) // With the document body..
contentEditable = !0, // Turn on contentEditable
innerHTML = [l.c], // Set innerHTML of our element to the value stored in localStorage
oninput = function () { // On input..
l.c = innerHTML // store our content in localStorage
}
!function(l){with(document.body)contentEditable=!0,innerHTML=[l.c],oninput=function(){l.c=innerHTML}}(localStorage)

Edit: Thanks to help from @mathiasbynens, @subzey and @beaufortfrancois we are now down to 115 bytes from my original 136.

I use this as a JavaScript snippet or bookmarklet in Chrome to turn the current blank tab into an offline text-editor which stores what I write in localStorage. The < 140 character version can be run via console.

The original version that you can add as a bookmarklet:

(function(d){l=localStorage,k='c',q=d.body;q.contentEditable=true;q.innerHTML=l[k]||'';q.oninput=function(){l[k]=q.innerHTML;}})(document);

A demo version of this is available on JSBin.

The optimized version (115 bytes):

!function(l){with(document.body)contentEditable=!0,innerHTML=[l.c],oninput=function(){l.c=innerHTML}}(localStorage)

Pretty version

Prettier version of the implementation using document.write (hah) to write over any existing tab content, gives you some styling too:

javascript:(function(d){d.write('<body contenteditable style="font: 2rem/1.5 monospace;max-width:60rem;margin:0 auto;padding:4rem;">');var k = 'c'; var q = d.querySelector('body');q.innerHTML=localStorage[k];q.oninput=function(){localStorage[k]=q.innerHTML;}})(document);

Preview:

DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Copyright (C) 2014 ADDY OSMANI <addyosmani.com>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
{
"name": "offlineTextEditor",
"description": "ContentEditable-powered Offline text editor",
"keywords": [
"text",
"edit",
"editor",
"localStorage",
"offline"
]
}
<!DOCTYPE html>
<title>Offline Text Editor</title>
<style>
body { font: 2rem/1.5 monospace;max-width:60rem;margin:0 auto;padding:4rem;}
</style>
<body>
<script>
!function(l){with(document.body)contentEditable=!0,innerHTML=[l.c],oninput=function(){l.c=innerHTML}}(localStorage);
</script>
</body>
@subzey
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subzey commented May 24, 2014

98 bytes:

document.body.outerHTML='<body contentEditable oninput=localStorage.c=innerHTML>'+[localStorage.c]

@xem
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xem commented May 24, 2014

just, whoa.

@subzey
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subzey commented May 24, 2014

...or maybe old dirty document.write?

document.write('<body contentEditable oninput=localStorage.c=innerHTML>'+[localStorage.c])

(90 bytes)

@francoisrigal
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francoisrigal commented May 24, 2014

Now with linkification (perfect web notepad)?

@xem
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xem commented May 24, 2014

What do you mean by linkification?
an online version? => http://xem.github.io/postit
or a version that can be used to share the content with a link => http://xem.github.io/paste
I'm wondering if the two features (localstorage + share via URL) can be mixed...

@addyosmani
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Author

addyosmani commented May 24, 2014

@subzey just..wow. That's pretty damn impressive on both counts. Well done!

@tsaniel
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tsaniel commented May 24, 2014

@subzey If you use it as a bookmarklet then you don't even need document.write.

javascript:'<body contentEditable oninput=localStorage.c=innerHTML>'+[localStorage.c]

(85 bytes)

@xem
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xem commented May 24, 2014

neat! I didn't know we could output html just after a "javascript:".
Do you know how to add a custom bookmarklet on firefox 29? There's no field to edit the url of a bookmark :s

@xem
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xem commented May 24, 2014

FYI, guoj has hosted a fork of this "post it" app here:
post.guoj.org

@tsaniel
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tsaniel commented May 24, 2014

@xem enable Bookmarks Toolbar and there you go

@fghhfg
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fghhfg commented May 24, 2014

How about this one?
What's the difference?

@xem
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xem commented May 24, 2014

It's the same thing, expect this one has an autosave feature. (localstorage persistance)

@addyosmani
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addyosmani commented May 25, 2014

@xem it would be nice if guoj included a link back :)

@tsaniel Whoa. I had no idea that could work. 85 bytes is the current golf record for this one. Nice job!

@tsaniel
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tsaniel commented May 25, 2014

I don't think there is any room to save bytes.

@aemkei
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aemkei commented May 26, 2014

If we don't care about global leaks, it could be 83 bytes:

document.write('<body contentEditable oninput=l.c=innerHTML>'+[(l=localStorage).c])

@yogendra
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yogendra commented May 26, 2014

Here's a extended version (slightly longer) but works offline and preserves your text, no matter which site you are on. Just make a bookmarklet of this.

javascript:window.open("javascript:'<body contentEditable oninput=localStorage.c=innerHTML>'+[localStorage.c]", "_mynotes")

UPDATE: Yikes wrote that too soon. This still is page dependent. It will open a new window but will use localStorage on a per page basis. Sad :(

@liorama
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liorama commented May 26, 2014

Change 'body' to a simple 'a':
javascript:'<a contentEditable oninput=localStorage.c=innerHTML>'+[localStorage.c]

@tsaniel
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tsaniel commented May 26, 2014

@yogendra Interesting. However it does not work for me?

@tsaniel
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tsaniel commented May 26, 2014

@liorama There are some problems not using body:

  1. The editing area's height and width are not 100%.
  2. It may not work with paragraphs (more than one line).

@tsaniel
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tsaniel commented May 26, 2014

@aemkei Actually If we count javascript: it should be +11bytes, or if we don't count javascript: mine will be -11bytes. Not sure which one to go.

@liorama
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liorama commented May 26, 2014

@tsaniel I thought about the 100% height issue, but the element takes the height of it's contents so does it really matter? (apart from the visible border around the text)
As for the paragraph, it works well for me in Chrome (as well as when using 'body'). If it is a problem we can try a div instead.

@aemkei
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aemkei commented May 26, 2014

@tsaniel: You are right: It depends on the rules. And if we follow the strict rules from 140byt.es it is still 114 bytes.

@tsaniel
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tsaniel commented May 26, 2014

@aemkei Indeed.
By the way, it's been a long time since 140bytes was created, a lot of things have changed.
Back then, Jed said the community should stick to ES3, now even ES6 is coming out. Maybe 140bytes really needs an update. For instance, arrow function.

@tsaniel
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tsaniel commented May 26, 2014

@liorama Maybe it depends on personal preference. I just find full height element handy, as I can click to focus everywhere.

@liorama
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liorama commented May 26, 2014

@tsaniel My personal preference is formatting and syntax highlighting but those might be a problem with the 140bytes restriction 😄

@xem
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xem commented May 27, 2014

Maybe 140bytes really needs an update. For instance, arrow function.
My #1 request would be to allow 140 characters instead of 140 bytes, to allow things like that:
http://xem.github.io/miniCodeEditor/tweet.html
But then the name of the site would have to change...

@tsaniel
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tsaniel commented May 28, 2014

@xem I'm afraid if 140 characters are allowed then every gist will use the same encoding trick?

@xem
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xem commented May 28, 2014

yeah... but it's not only for the encoding trick.
Twitter counts Unicode characters, 140byt.es counts bytes...
So a 140-char script containing some multibyte characters would fit in twitter but not here.

@xcislav
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xcislav commented Jul 16, 2014

89b

I don't understand:
square brackets [ ]
localStorage (the cookies of a browser)
innerHTML in quotes
.c

My understanding is:
and equals sign (=)
onload event
contentEditable
.innerHTML as a property

(for example, I understand the .innerHTML property of

when using it with contentEditable attribute - div then becomes like <input/textarea>)

Summary: Could Someone give a brief description of the editor's work?

@orschiro
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orschiro commented May 10, 2017

Can someone please explain to me how to use this code as a bookmarklet?

Thanks!

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