defer-css
Advanced tools
Readme
Simple LightWeight function to defer css in your web applications or websites.
DEMO: Jsfiddle.net
Two functions and one object is set to global window
| Function | Arguments | Usage |
|---|---|---|
| deferCss | (scripts=[], mountOnId='defer-css') | For loading a style or array of styles |
| hasStyleSheet | (search='', return=false) | A bonus helper function for checking if the browser has loaded a particular stylesheet using document.styleSheets |
if $return is "all" the CSSStyleSheet Object is returned, else if any string we assume its a key in the CSSStyleSheet object you are trying to get. |
<!--Using JsDeliver CDN-->
<script src="https://cdn.jsdelivr.net/npm/defer-css"></script>
<!-- Or Using UnPkg CDN-->
<script src="https://unpkg.com/defer-css"></script>
You can include defer-css in your project using require or import but defer-css does not export anything.
It sets window.deferCss, window.deferCssData && window.hasStyleSheet
Defined styles are loaded before any element with id defer-css id in your page
<html>
<head>
<script src="https://cdn.jsdelivr.net/npm/defer-css"></script>
<!-- Styles will be placed before this element-->
<link id="defer-css"/>
</head>
</html>
You can change this to your custom id
<head>
<!-- Some Styles -->
<link href="....">
<link href="....">
<link href="....">
<!-- Styles will be placed before this add-css-here element-->
<link id="add-css-here"/>
</head>
Load Css using javascript
deferCss([
'style-1.min.css',
{href: 'style-2.min.css', crossOrigin: 'anonymous'}
], 'add-css-here')
Adds the following styles
<link rel="stylesheet" href="style-1.min.css">
<link rel="stylesheet" href="style-2.min.css" crossorigin="anonymous">
The values of the styles array can either be a url string or an object that will be used to build your link element
If the object includes an onDefer function, it is executed when the css file is loaded.
deferCss([
{
href: 'style-1.min.css',
onDefer: function() {
// do something
}
},
])
Lets say you want to mount css in multiple places.
<head>
<link id="main-css">
<style>
.some-style-before-other-css{
background: teal;
}
</style>
<link id="other-css">
</head>
deferCss(['main-css-1.css', 'main-css-2.css'], 'main-css');
deferCss([
{ href: 'other-css-1.css', crossOrigin: 'anonymous' },
'other-css-2.css'
], 'other-css');
This will result to.
<link rel="stylesheet" href="main-css-1.css">
<link rel="stylesheet" href="main-css-2.css">
<style>
.some-style-before-other-css{
background: teal;
}
</style>
<link rel="stylesheet" href="other-css-1.css" crossorigin="anonymous">
<link rel="stylesheet" href="other-css-2.css">
The deferCssData includes details you may need.
({
// Element mounted on, default = 'defer-css'
"defer-css": {
total: Number, // total number of css defined
loaded: Number // total number of css loaded (at the moment)
}
});
FAQs
ExtraSlim Javascript to Load css in your page without affecting load speed.
The npm package defer-css receives a total of 0 weekly downloads. As such, defer-css popularity was classified as not popular.
We found that defer-css demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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