How does this client-side organizer track incident milestones and mask sensitive identifiers directly in browser memory?
This application serves as an in-browser record organizer that collects chronological collision milestones, items of direct expense, and document redaction overlays entirely within client storage without remote transmission. Milestones are sorted by timestamp strings, expenses are summed dynamically into an out-of-pocket economic damages total, and checklist toggles update an aggregate preparation score. Document masking renders user-defined bounding rectangles directly onto an HTML5 2D canvas bitmap, permanently overwriting raw underlying pixel data prior to image export.
The organizer stores information locally using Web Storage (localStorage) and exports plain JSON text or PNG bitmaps; it does not encrypt local storage, evaluate legal liability under Texas proportionate responsibility rules, or verify insurance coverage. Canvas redaction flattens drawn boxes directly into bitmap pixels for raster graphics, but this browser-only script does not redact vector metadata or embedded text streams from multi-page PDF documents.
Try a worked example
In the 'Collision Expenses & Economic Damages' section, choose the category 'Transportation', enter 'Rental Car (4 Days)' into the description field, type '220.00' into the amount input, and click '+ Add Expense'. The ledger appends a third row, updates the badge from '2 Receipts' to '3 Receipts', and recalculates the tracked expense total from $625.00 to $845.00.
Canvas Raster Overwrite Mechanics
The redaction module relies on the HTML5 Canvas API and CanvasRenderingContext2D interface. When the user defines a bounding region with pointer gestures, the application executes fillRect() to draw solid black fill rectangles over the canvas buffer coordinates. Unlike vector markup or CSS styling overlays that merely conceal text visually, drawing directly onto a 2D raster canvas alters the underlying bitmap pixel values, eliminating the original graphical characters from exported PNG snapshots. MDN Web Docs: Canvas API
Because canvas content is rendered as a raw pixel bitmap rather than structured DOM nodes, screen readers and magnification tools cannot inspect graphic elements within the canvas itself. For full legal and evidentiary packets, accessible text backing records—such as the JSON brief or ledger summary—must accompany any visual documentation. MDN Web Docs: Canvas API
Statutory Context for Crash Documentation in Texas
Official incident reports referenced in police-involved collisions—such as report SAPD-2026-8841 modeled in the organizer—correspond to Texas peace officer crash reports codified under state statutory frameworks. Texas law prescribes specific procedures for investigating agencies to record operator identities, carrier registrations, vehicle descriptions, and crash conditions following collisions resulting in injury or property damage.
Contemporaneous logging of medical assessments, towing fees, and repair milestones assists claimants in maintaining an unbroken audit trail of incident-related economic losses before initiating formal insurance or legal claims.
Explains HTML5 Canvas rendering mechanics, bitmap pixel representation, accessibility considerations, and the 2D drawing context used for client-side redaction.
Separate entered evidence counts, canvas masks and packet exports
Read the explanation
This evidence organizer contains a synthetic accident fixture, not verified events, expenses, liability or legal advice. Its initial ledger has two entries: medical three hundred fifty and towing two hundred seventy-five, totaling six hundred twenty-five. Adding a hundred-dollar entered expense gives seven hundred twenty-five; deleting that record restores six hundred twenty-five. Category labels are descriptive and the total simply sums all amounts. Five consultation checklist boxes start checked, so five divided by five times one hundred displays one hundred percent. Clearing two gives three of five and sixty percent; clearing all gives zero. These are counts of user assertions, not independently verified documents or legal readiness. The bars use one pixel per entered dollar and seven pixels per checklist percentage-point. Added events are sorted as text time strings, so zero-padded hours behave chronologically but arbitrary input formats can sort unexpectedly. The canvas sample is six hundred by two hundred eighty drawing pixels. Pointer coordinates map from its displayed rectangle back into that buffer by multiplying by buffer width divided by displayed width, and the equivalent height ratio. For an illustrative half-size display of three hundred by one hundred forty, a sixty by twenty drag becomes one hundred twenty by forty drawing pixels. The source stores a rectangle only when both dimensions are strictly greater than five pixels. Stored masks are painted black into the canvas, and the Download Redacted button produces a separate PNG raster. This diagram uses the same two-times coordinate scale; it is not an automatic identifier detector. The preset demonstration mask has fixed geometry, not proof that all sensitive text is covered. The original mobile touch end handler reads the first active touch when there are no active touches, throwing a clientX error; our actual native offline touch test confirmed it failed to add a mask. Desktop pointer drawing is tested separately and that source mobile limitation remains reported. The JSON consultation packet contains incident fields, timeline, expense records, totals and the calculated checklist percentage. It does not include the masked canvas image or mask rectangle list. A hundred-percent checklist packet can therefore exist without a newly completed redaction. The saved ledger persists through browser localStorage, but canvas masks are not stored there: reloading retains entered events and expenses while drawing the default demonstration document again. Reset Defaults restores three fixture events, two expense entries and five checked boxes after a native confirmation; Load Incident Citation resets the canvas sample and its one demonstration rectangle. Clearing Masks removes all canvas rectangles without clearing ledger records. The clipboard summary is another text projection and does not attach the PNG. These are separate artifacts and persistence paths. Local native tests verify ledger reload, pointer masks, actual PNG and JSON downloads and source touch errors with every network request blocked. None of those checks verifies the fixture case, privacy completeness or legal claims.