carto/lib/less/browser.js

46 lines
1.5 KiB
JavaScript

//
// Select all links with the 'rel' attribute set to "less"
//
var sheets = document.querySelectorAll("link[rel=less]");
for (var i = 0; i < sheets.length; i++) {
(function (sheet) { // Because the functions here are async, we need to create a closure
xhr(sheet.href, function (data) {
new(less.Parser)({ optimization: 3 }).parse(data, function (e, root) {
var css = document.createElement('style'), styles;
css.type = 'text/css';
css.media = 'screen';
css.title = sheet.title || sheet.href.match(/\/([-\w]+)\.[a-z]+$/i)[1];
styles = root.toCSS();
if (css.styleSheet) {
css.styleSheet.cssText = styles;
} else {
css.appendChild(document.createTextNode(styles));
}
document.getElementsByTagName('head')[0].appendChild(css);
});
});
})(sheets[i]);
}
function xhr(url, callback, errback) {
var xhr = new(XMLHttpRequest);
var headers = {
'X-Requested-With': 'XMLHttpRequest',
'Accept': 'text/*'
};
xhr.open('get', url, true);
xhr.onreadystatechange = function () {
if (this.readyState != 4) { return }
if (this.status >= 200 && this.status < 300) {
callback(this.responseText);
} else if (typeof(errback) === 'function') {
errback(this.responseText);
}
};
xhr.send();
}