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/**
* Add methods to dynamically insert and remove css styles.
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @copyright Stud.IP Core Group 2014
* @license GPL2 or any later version
* @since Stud.IP 3.1
*/
// "Private" stylesheet rules are applied to, generated from a dynamically
// inserted style tag in the document's header
let sheet = null;
// Expose functions to global STUDIP object, namespaced under CSS
class CSS {
/**
* Dynamically add a ruleset for a given selector to the current site
*
* @param {string} selector - CSS selector to add rules for
* @param {object} css - Actual css rules as hash object
* @param {array} vendors - Optional array of vendor prefixes to apply
*/
static addRule(selector, css, vendors) {
vendors = vendors ?? [];
vendors.push('');
if (sheet === null) {
let style = document.createElement('style');
sheet = document.head.appendChild(style).sheet;
}
let propText = Object.keys(css)
.map(p => {
let result = [];
for (let i = 0; i < vendors.length; i += 1) {
result.push(vendors[i] + p + ':' + css[p]);
}
return result.join(';');
})
.join(';');
sheet.insertRule(selector + '{' + propText + '}', sheet.cssRules.length);
}
/**
* Removes a currently added, dynamic ruleset.
*
* @param {string} selector - CSS selector to remove rules for
*/
static removeRule(selector) {
if (sheet === null) {
return;
}
for (let i = sheet.cssRules.length - 1; i >= 0; i -= 1) {
if (sheet.cssRules[i].selectorText === selector) {
sheet.deleteRule(i);
}
}
}
}
export default CSS;
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