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How can I tell if a DOM element is visible in the current viewport?
...uld use Dan's solution if you do not need to support version of Internet Explorer before 7.
Original solution (now outdated):
This will check if the element is entirely visible in the current viewport:
function elementInViewport(el) {
var top = el.offsetTop;
var left = el.offsetLeft;
var w...
Extending an Object in Javascript
... from Java to Javascript, and it's a bit hard for me to figure out how to extend objects the way I want it to do.
16 Answer...
How to echo with different colors in the Windows command line
... a rare thing to see an windows without .NET framework even for the oldest XP/2003 installations) . It uses jscript.net compiler to create an exe capable to print strings with different background/foreground color only for the current line.
@if (@X)==(@Y) @end /* JScript comment
@echo off
setlocal
...
How to get my IP address programmatically on iOS/macOS?
...
The following code finds all IPv4 and IPv6 addresses on an iOS or OSX device. The first getIPAddress method acts more or less as the older code in this answer: you can prefer either one or the other type address, and it always prefers WIFI over cellular (obviously you could change this).
Mor...
Efficiency of premature return in a function
This is a situation I encounter frequently as an inexperienced programmer and am wondering about particularly for an ambitious, speed-intensive project of mine I'm trying to optimize. For the major C-like languages (C, objC, C++, Java, C#, etc) and their usual compilers, will these two functions ru...
What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
...ecify which versions.
The Gemfile.lock file is where Bundler records the exact versions that were installed. This way, when the same library/project is loaded on another machine, running bundle install will look at the Gemfile.lock and install the exact same versions, rather than just using the Gem...
demystify Flask app.secret_key
.... For just Flask itself, that 'anything' is the Session object, but other extensions can make use of the same secret.
secret_key is merely the value set for the SECRET_KEY configuration key, or you can set it directly.
The Sessions section in the Quickstart has good, sane advice on what kind of se...
Who architected / designed C++'s IOStreams, and would it still be considered well-designed by today'
...d their way into the standard: auto_ptr, vector<bool>, valarray and export, just to name a few. So I wouldn't take the presence of IOStreams necessarily as a sign of quality design.
IOStreams have a checkered history. They are actually a reworking of an earlier streams library, but were autho...
string sanitizer for filename
...- how about using a whitelist of characters you are happy to be used? For example, you could allow just good ol' a-z, 0-9, _, and a single instance of a period (.). That's obviously more limiting than most filesystems, but should keep you safe.
...
Modify request parameter with servlet filter
An existing web application is running on Tomcat 4.1. There is an XSS issue with a page, but I can't modify the source. I've decided to write a servlet filter to sanitize the parameter before it is seen by the page.
...