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include(): JavaScript function for dynamically including a CSS or JS file on a page
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/** | |
* Includes the CSS or JS file into the head of the page. | |
* | |
* Examples: | |
* include('http://example.com/script.js') | |
* include('http://example.com/style.css') | |
* include('http://example.com/script.php', 'js') | |
* @param {string} url URL of the CSS or JS file | |
* @param {string} [type] 'css' or 'js' to specify the type of file. | |
* This parameter is optional, but it should be | |
* used if the url does not end in '.css' or '.js'. | |
*/ | |
const include = (url, type = url.split('.').pop()).toLowerCase(), onload = function() {}, onerror = function() {}) => { | |
let elem; | |
if (type === 'css') { | |
elem = document.createElement('link'); | |
elem.rel = 'stylesheet'; | |
elem.href = url; | |
} else if (type === 'js') { | |
elem = document.createElement('script'); | |
elem.src = url; | |
elem.async = false; | |
} else { | |
throw new Error('Failed to include ' + url + ' due to unknown file type.'); | |
} | |
elem.onload = onload; | |
elem.onerror = onerror; | |
document.head.appendChild(elem); | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/** | |
* Includes the CSS or JS file into the head of the page. | |
* | |
* Examples: | |
* include('http://example.com/script.js') | |
* include('http://example.com/style.css') | |
* include('http://example.com/script.php', 'js') | |
* @param {string} url URL of the CSS or JS file | |
* @param {string} [type] 'css' or 'js' to specify the type of file. | |
* This parameter is optional, but it should be | |
* used if the url does not end in '.css' or '.js'. | |
*/ | |
const include = (url, type = url.split('.').pop().toLowerCase()) => new Promise((resolve, reject) => { | |
let elem; | |
if (type === 'css') { | |
elem = document.createElement('link'); | |
elem.rel = 'stylesheet'; | |
elem.href = url; | |
} else if (type === 'js') { | |
elem = document.createElement('script'); | |
elem.src = url; | |
elem.async = false; | |
} else { | |
throw new Error('Failed to include ' + url + ' due to unknown file type.'); | |
} | |
elem.onload = resolve; | |
elem.onerror = reject; | |
document.head.appendChild(elem); | |
}); |
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