JavaScript tools for file handling, browser image processing, webcam access, and uploads, with Flash fallbacks when HTML5 support is missing.

Lightweight Angular JS file upload directive with old-IE support via FileAPI; Rails asset pipeline auto-loading can fail, so manual inclusion may be needed.

Deprecated Time#succ warnings can flood logs when time ranges are iterated or compared with include?; cover? or SQL BETWEEN avoid the issue.

CoffeeScript treats on and yes as true, and off and no as false, so variables or functions with those names trigger reserved-word errors.

Sidekiq workers can hang at 0% CPU because one thread blocks inside select; sending TTIN to the process prints backtraces for every thread.

FreeBSD Perl package updates can fail with missing .packlist files after a ports tree bug; cleaning the ports tree fixes the pkg-static lstat error.

Angular 1.2 invalid form values can disappear from ngModel, leaving old data unchanged; a directive can keep empty strings, and Angular 1.3 adds allowInvalid.

PostgreSQL enum values can be listed as an array with enum_range() and expanded into rows with unnest() for lookups or validation.

Copying multi-line cell content from LibreOffice Calc can add wrapping quotes and double inner quotes, which breaks pasted text like license keys.

Angular 1.2 lacks ngModelController.$setDirty; calling model.$setViewValue(model.$viewValue) marks the model dirty without changing its value.

git diff can render umlauts and other UTF-8 characters as byte codes when less uses the wrong charset. Setting LESSCHARSET=UTF-8 fixes the display.

Runtime association filters are hard in Rails because :conditions cannot take a lambda; a string-interpolation hack or proc can evaluate date-based rules.

Self-contained Ruby binaries run on any Linux distribution and OS X machine, letting app developers ship one package without requiring Ruby or gems on the user’s system.

Large AngularJS screens slow down when many watchers and bindings trigger digest work; reducing watcher-heavy patterns improves rendering performance.

_.extend, _.assign, and _.merge mutate the destination object; passing {} first creates a new object and leaves the originals unchanged.

Adobe Reader is no longer supported on Linux, but some PDFs and forms still need acroread when Ubuntu's default viewer fails.

Rails asset pipeline issues make vendor libraries hard to keep separate; custom asset paths and rewritten font URLs preserve clean library folders and correct references.

AngularJS controllers can avoid $scope by binding data to this and using a controller alias in templates for clearer model access.

Rails asset delivery relies on manifests and explicit requires; precompilation output helps verify URLs and troubleshoot missing or misplaced assets.

Forced layout work in a $watch can cause flicker and scroll jumps; deferring it until the current digest finishes avoids repaint glitches.

LibreOffice Writer text frames can print as black blocks when background fill is enabled. Setting the frame background to no fill prevents the printing defect.

Chromedriver on Linux often falls out of sync with Chrome, causing test failures. Official downloads, geordi chromedriver-update, or package-based installs can keep the driver current.

Sidekiq::Client.push can enqueue a job with a worker class and arguments, matching WorkerClass.perform_async for dynamic job creation.

Truncates overflowing HTML content with an ellipsis, including multi-line text. Useful when CSS text-overflow is limited to single lines and -webkit-line-clamp lacks broad support.