Makes text fit perfectly to its container. Ideal for flexible and responsive websites.
Download the fitty.min.js file from the /dist folder.
Include the script on your page.
Call fitty like shown below and pass an element reference or a querySelector.
<div id="my-element">Hello World</div>
<script src="fitty.min.js"></script>
<script>
fitty('#my-element');
</script>Fitty calculates the size difference between the parent and child container, then it resizes the child to fit the parent.
You can pass the following option properties.
minSize
The minimum font size in pixels. Default is 16.
maxSize
The maximum font size in pixels. Default is 512. What can I say, I like powers of two.
multiLine
Wrap lines when using minimum font size. Default is true.
observeMutations
Rescale when element contents is altered. Is set to false when MutationObserver is not supported. Pass true to use the default MutationObserverInit configuration, pass a custom MutationObserverInit config to optimize monitoring based on your project.
Default configuration
{
subtree: true,
childList: true,
characterData: true
}You can pass custom arguments like this (currently shows default values)
fitty('#my-element', {
minSize: 16,
maxSize: 512,
multiLine: true,
observeMutations: 'MutationObserver' in window
});fitty.observeWindow
Observe the window for resize and orientationchange events. Default is true.
fitty.observeWindowDelay
Redraw delay for when above events are triggered. Default is 100.
fit()
Force a redraw of the current fitty element.
unsubscribe()
Remove the fitty element from the redraw loop and restore it to its original state.
var myFitty = fitty('#my-element');
// force refit
myFitty.fit();
// unsubscribe from fitty
myFitty.unsubscribe();fitty.fitAll()
Refits all fitty instances to their parent containers.
For optimal performance add a CSS selector to your stylesheet that sets the elements that will be resized to have white-space:nowrap and display:inline-block. If not, Fitty will detect this and will have to restyle the elements itself resulting in a slight performance penalty.
Suppose all elements that you apply fitty to have the class fit, add this CSS selector:
.fit {
display: inline-block;
white-space: nowrap;
}Should you only want to do this when JavaScript is available, add the following to the <head> of your web page.
<script>document.documentElement.classList.add('js');</script>And change the CSS selector to:
.js .fit {
display: inline-block;
white-space: nowrap;
}Fitty does not concern itself with custom fonts. But it will be important to redraw Fitty text after a custom font has loaded (as measurements are probably incorrect at that point).
If you need to use fitty on browsers that don't have CSS Font Loading support (Edge and Internet Explorer)you can use the fantastic FontFaceObserver by Bram Stein to detect when your fonts have loaded.
See an example custom font implementation below.
(function() {
// no promise support (<=IE11)
if (!('Promise' in window)) {
return;
}
// called when all fonts loaded
function redrawFitty() {
document.documentElement.classList.add('fonts-loaded');
fitty.fitAll();
}
// Native solution, uses CSS Font Loader
function native() {
// load our custom Oswald font
var fontOswald = new FontFace('Oswald', 'url(assets/oswald.woff2)', {
style:'normal',
weight:'400'
});
document.fonts.add(fontOswald);
fontOswald.load();
// if all fonts loaded redraw fitty
document.fonts.ready.then(redrawFitty);
}
// Fallback, use FontFaceObserver for older browsers
function fallback() {
var style = document.createElement('style');
style.textContent = '@font-face { font-family: Oswald; src: url(assets/oswald.woff2) format("woff2");}'
document.head.appendChild(style);
var s = document.createElement('script');
s.src = 'https://cdnjs.cloudflare.com/ajax/libs/fontfaceobserver/2.0.13/fontfaceobserver.standalone.js';
s.onload = function() {
new FontFaceObserver('Oswald').load().then(redrawFitty);
};
document.body.appendChild(s);
}
// CSS Font Load Supported?
if ('fonts' in document) {
native();
}
else {
fallback();
}
}());Will not work if the element is not part of the DOM.
- Modern browsers
- IE 10+
Versioning follows Semver. Within 24 hours we moved to version 2.0.
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