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kaiwa/clientapp/libraries/system-requirements.js
2013-06-03 15:51:30 -07:00

85 lines
2.0 KiB
JavaScript

(function () {
var ua = navigator.userAgent,
trim = function(string) {
return string.replace(/^[\s\uFEFF]+|[\s\uFEFF]+$/g,'')
},
valid = {
ie: 'msie',
msie: 'msie',
ff: 'firefox',
firefox: 'firefox',
safari: 'safari',
chrome: 'chrome',
opera: 'opera'
};
// from: http://stackoverflow.com/a/5918791/107722
function getVersion() {
var N = navigator.appName,
tem,
M = ua.match(/(opera|chrome|safari|firefox|msie)\/?\s*(\.?\d+(\.\d+)*)/i);
if (M && (tem= ua.match(/version\/([\.\d]+)/i))!= null) M[2] = tem[1];
M = M? [M[1], M[2]]: [N, navigator.appVersion, '-?'];
return M;
}
var ver = getVersion(),
name = ver[0].toLowerCase(),
version = parseFloat(ver[1]);
function parseBrowserTypes(string) {
var arr = string.split('or'),
passed = false,
i = 0,
l = arr.length,
split,
translatedName,
hasPlus;
for (; i < l; i++) {
split = trim(arr[i]).split(' ');
translatedName = valid[split[0].toLowerCase()];
if (!translatedName) {
throw new Error('Unrecognized browser name:' + split[0]);
}
if (translatedName === name) {
hasPlus = split[1].indexOf('+') !== -1;
if (hasPlus) {
passed = parseFloat(split[1]) <= version;
} else {
passed = parseFloat(split[1]) === version;
}
}
if (passed) break;
}
return passed;
}
window.systemRequirements = function (browserString) {
var passed = false,
failUrl,
i = 0,
l = arguments.length;
if (typeof browserString === 'string') {
if (!parseBrowserTypes(browserString)) {
return false;
}
// incr starting point for loop
i = 1
}
for (; i < l; i++) {
if (arguments[i] instanceof Function) {
if (!arguments[i]()) {
return false;
}
}
}
return true;
};
})();