圆钢采购计算模块

Overview

A self-contained, frontend-only web app for round-steel (圆钢) purchasing:
maintain basic material info → assemble purchase requirement combos → compute
ordering lengths / bars / weight / cost per the steel-mill Excel convention.

Pure HTML/CSS/JS. No server, no build step. Data persists in browser localStorage.

When to use

• User asks for a "圆钢采购计算 / 订购长度计算 / 定尺下料计算" tool or page.
• User provides an Excel spec for ordering-length (订购长度) and wants a matching calculator.
• User needs a locally-runnable, copy-deployable procurement worksheet (single file).
• User wants to reproduce the Excel formula: H=TRUNC(maxLen/L), I=L×H, J=Q/H,
  bars=CEILING(J), ordering length G = max(I)+allow (see references/calc-formulas.md).

Quick start (deploy the bundled app)

The working implementation is in assets/round-steel-procurement/:

• index.html + styles.css + app.js — multi-file source (edit logic here).
• 圆钢采购计算.html — single-file inlined build, double-click to run, ready to copy/deploy.

To ship immediately, copy assets/round-steel-procurement/ to the user's target directory.
Either open index.html in a browser, or hand out 圆钢采购计算.html as the portable build.

From-scratch generation

When the user wants custom logic instead of the bundled copy:

1. Build a 3-tab SPA:
   - Tab ① 圆钢基本信息 — 货号 / ID号 / 规格Φ / 材质 / 牌号 / 密度(g/cm³) / 单价(元/kg) / 备注; CRUD + search.
   - Tab ② 采购需求组合 — multiple combos; each line = 圆钢 + 所需长度(mm) + 件数; same 货号 may have multiple rows of different lengths; carry over 基本信息.
   - Tab ③ 订购长度计算 — pick a combo + 工艺余量(allow) + G-mode, output 订购根数/总长/重量/金额 + per-货号 table.
2. Implement the calculation exactly as references/calc-formulas.md (MAX/TRUNC/CEILING, G two-tier binning). Do NOT reintroduce the abandoned K-tier optimal version.
3. Persist state in localStorage (key round_steel_procurement_v2), add JSON export/import.
4. For any delete action, use an in-page confirm overlay (自建遮罩 askConfirm), never window.confirm — preview sandboxes swallow native confirm.

Packaging into a single portable file

For copy-deploy, inline CSS + JS into one .html (no external src/link). Keep the
圆钢采购计算.html pattern: self-contained, opens via file://, data in localStorage.

Resources

• assets/round-steel-procurement/ — runnable source + single-file build (copy/deploy as-is).
• references/calc-formulas.md — exact Excel formula, G reproduction rule, and the attachment
  verification table. Read this before writing or modifying any calculation code.

Constraints

• Chromium-family browser required (the dialog element, localStorage).
• No credentials, no network calls. Keep it offline-capable.
• Deletion must always confirm first and clean up referencing combo lines.