I need to use javascript to detect whether a page is responsive. On a galaxy note 3, here are the values for a non-responsive and a responsive pages:
non-responsive:
window.innerWidth:980
clientWidth:980
screen.width:640
responsive:
window.innerWidth:640
clientWidth:640
screen.width:640
So is it correct to say that if clientWidth == screen.width
then it is responsive, else it is non-responsive?
As you know, there's an important feature used in responsive design call media query, with which browser can switch alternative CSS rules for different screen resolutions to make page "responsive".
You can enum CSS rules in Javascript using document.styleSheets
. And CSS like
@media all and (max-width:1023px) {
/* some styles */
}
will add some instances of CSSMediaRule in cssRules collection. Here's my detection code. Works in Chrome and Safari.
function isResponsive() {
if (document.styleSheets || (typeof window.CSSMediaRule).match(/function|object/)) {
// find avaliable style sheets
return [].some.call(document.styleSheets, function(css) {
if (!css.cssRules) {
return false;
}
// find avaliable rules
return [].some.call(css.cssRules, function(rule) {
if (rule instanceof CSSMediaRule) {
return [].some.call(rule.media, function(media) {
return !media.match(/print/i);
});
}
});
});
}
// There's no avaliable style sheet, or the browser doesn't support media queries
return false;
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.