Add Styles to Console Statements
I was recently checking out Google Plus because they implement some awesome effects. I opened the console and same the following message:
WARNING!
Using this console may allow attackers to impersonate you and steal your information using an attack called Self-XSS.
Do not enter or paste code that you do not understand.
I wasn't surprised to see that message but what I did notice was that the text was red and the background was yellow. The text was even a bit bigger. How did they do it? Pretty easily:
console.log("%c%s",
"color: red; background: yellow; font-size: 24px;",
"WARNING!");
The first argument is the order of style and message, the second is the style set, and the last is the desired message.
As to why you'd want to use this? If it helps you identify debug information easier in the console, you may consider calling more attention to some messages!
![CSS Animations Between Media Queries]()
CSS animations are right up there with sliced bread. CSS animations are efficient because they can be hardware accelerated, they require no JavaScript overhead, and they are composed of very little CSS code. Quite often we add CSS transforms to elements via CSS during...
![5 More HTML5 APIs You Didn’t Know Existed]()
The HTML5 revolution has provided us some awesome JavaScript and HTML APIs. Some are APIs we knew we've needed for years, others are cutting edge mobile and desktop helpers. Regardless of API strength or purpose, anything to help us better do our job is a...
![MooTools 1.2 OpenLinks Plugin]()
I often incorporate tools into my customers' websites that allow them to have some control over the content on their website. When doing so, I offer some tips to my clients to help them keep their website in good shape. One of the tips...
![CSS Kwicks]()
One of the effects that made me excited about client side and JavaScript was the Kwicks effect. Take a list of items and react to them accordingly when hovered. Simple, sweet. The effect was originally created with JavaScript but come five years later, our...
Easy, if one controls the browser and therefor the console, that has to display this ;) But Firefox supports this as well, and only IE prints both, the format string as the string itself 1:1 into F12.
There’s a JS library that makes styling comments much easier:
https://github.com/astoilkov/console.message
By replacing your formatting placeholders with
%c%o, it will output a readable repr for any type of object you pass in, not just the str value.https://jsfiddle.net/jsatt/Lta6p2jz/2/
very cool advice! my console is very colour ;)
With some trickery you can inject images too!
console.log("%cDuckie.TV", "color:transparent; font-size: 16pt; line-height: 125px; padding:25px; padding-top:30px; padding-bottom:60px; background-image:url(http://duckietv.github.io/DuckieTV/img/icon128.png); background-repeat:no-repeat; ", "quack!\n\n\n\n\n\n");I find it amusing that this post starts with an example of a warning not to copy & paste code into the console, and ends with me wanting to copy & paste code from people’s comments into the console.
But it’s okay, cause I sort of understand it, right?
I like to put an object at the top of my script when I am developing to create a shortcut for styling my logs:
// for styling console.log // EXAMPLE: console.log(sty.sty, sty.red, 'thingToLog:' ,+ foo); var sty = { sty: '%c%s', grn: 'background:#9c9;color:#141;padding:.25em;line-height:1.5em;', ylw: 'background:#ff0;color:#993;padding:.25em;line-height:1.5em;', red: 'background:#c99;color:#411;padding:.25em;line-height:1.5em;', org: 'background:#da0;color:#830;padding:.25em;line-height:1.5em;', gry: 'background:#666;color:#fff;padding:.25em;line-height:1.5em;', prp: 'background:#97e;color:#405;padding:.25em;line-height:1.5em;', blu: 'background:#8ac;color:#036;padding:.25em;line-height:1.5em;' };