-new Date().getTimezoneOffset()/60; The method getTimezoneOffset() will subtract your time from GMT and return the number of minutes. So if you live in GMT-8, it will return 480. To put this into hours, divide by 60. Also, notice that the sign is the opposite of what you need – it’s calculating GMT’s offset from your time … Read more
Since originally writing this answer, a new specification has reached recommendation status thanks to the W3C. The Page Visibility API (on MDN) now allows us to more accurately detect when a page is hidden to the user. document.addEventListener(“visibilitychange”, onchange); Current browser support: Chrome 13+ Internet Explorer 10+ Firefox 10+ Opera 12.10+ [read notes] The following code … Read more
WebKit supports scrollbar pseudo elements that can be hidden with standard CSS rules: #element::-webkit-scrollbar { display: none; } If you want all scrollbars hidden, use ::-webkit-scrollbar { display: none; } I’m not sure about restoring – this did work, but there might be a right way to do it: ::-webkit-scrollbar { display: block; } You … Read more
Now you can see both the pseudo-class rules and force them on elements. To see the rules like :hover in the Styles pane click the small :hov text in the top right. To force an element into :hover state, right click it and select :hover. Additional tips on the elements panel in Chrome Developer Tools … Read more
JavaScript has two number types: Number and BigInt. The most frequently-used number type, Number, is a 64-bit floating point IEEE 754 number. The largest exact integral value of this type is Number.MAX_SAFE_INTEGER, which is: 253-1, or +/- 9,007,199,254,740,991, or nine quadrillion seven trillion one hundred ninety-nine billion two hundred fifty-four million seven hundred forty thousand … Read more
Websockets and SSE (Server Sent Events) are both capable of pushing data to browsers, however they are not competing technologies. Websockets connections can both send data to the browser and receive data from the browser. A good example of an application that could use websockets is a chat application. SSE connections can only push data … Read more
This works in all browsers: window.location.href=”https://stackoverflow.com/questions/1226714/…”; If you wanted to change the page without it reflecting in the browser back history, you can do: window.location.replace(“https://stackoverflow.com/questions/1226714/…”);
Now most browsers support getBoundingClientRect method, which has become the best practice. Using an old answer is very slow, not accurate and has several bugs. The solution selected as correct is almost never precise. This solution was tested on Internet Explorer 7 (and later), iOS 5 (and later) Safari, Android 2.0 (Eclair) and later, BlackBerry, … Read more
Cookies and local storage serve different purposes. Cookies are primarily for reading server-side, local storage can only be read by the client-side. So the question is, in your app, who needs this data — the client or the server? If it’s your client (your JavaScript), then by all means switch. You’re wasting bandwidth by sending … Read more
I have been making a Chrome app called Postman for this type of stuff. All the other extensions seemed a bit dated so made my own. It also has a bunch of other features which have been helpful for documenting our own API here. Postman now also has native apps (i.e. standalone) for Windows, Mac … Read more