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Created June 18, 2023 02:09
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Javascript Inventory Web App
Raw
0-JS-INVENTORY.MD

JAVASCRIPT INVENTORY PWA

https://code-boxx.com/inventory-management-system-javascript/

NOTES

  1. Access https://your-site.com/js-inventory.html in your browser.
  2. Not newbie-friendly, but it's a good study for progressive web apps.

IMAGES

favicon icon-512

LICENSE

Copyright by Code Boxx

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Raw
js-inventory-db.js
// (A) INDEXED DB
const IDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
var invDB = {
// (B) INITIALIZE DATABASE
db : null,
init : () => new Promise((resolve, reject) => {
// (B1) OPEN INVENTORY DATABASE
invDB.db = IDB.open("JSINV", 1);
// (B2) CREATE INVENTORY DATABASE
invDB.db.onupgradeneeded = e => {
// (B2-1) INVENTORY DATABASE
invDB.db = e.target.result;
// (B2-2) ITEMS STORE
let store = invDB.db.createObjectStore("Items", { keyPath: "sku" });
store.createIndex("name", "name");
// (B2-3) MOVEMENT STORE
store = invDB.db.createObjectStore("Movement", { keyPath: ["sku", "date"] }),
store.createIndex("direction", "direction");
};
// (B3) ON IDB OPEN
invDB.db.onsuccess = e => {
invDB.db = e.target.result;
resolve(true);
};
// (B4) ON IDB ERROR
invDB.db.onerror = e => reject(e.target.error);
}),
// (C) TRANSACTION "MULTI-TOOL"
tx : (action, store, data) => new Promise((resolve, reject) => {
// (C1) GET OBJECT STORE
let req, tx = invDB.db.transaction(store, "readwrite").objectStore(store);
// (C2) PROCESS ACTION
switch (action) {
// (C2-1) NADA
default: reject("Invalid database action"); break;
// (C2-2) PUT
case "put":
req = tx.put(data);
req.onsuccess = e => resolve(true);
break;
// (C2-3) DELETE
case "del":
req = tx.delete(data);
req.onsuccess = e => resolve(true);
break;
// (C2-4) GET
case "get":
req = tx.get(data);
req.onsuccess = e => resolve(e.target.result);
break;
// (C2-5) GET ALL
case "getAll":
req = tx.getAll(data);
req.onsuccess = e => resolve(e.target.result);
break;
// (C2-6) CURSOR
case "cursor":
resolve(tx.openCursor(data));
break;
}
req.onerror = e => reject(e.target.error);
})
};
Raw
js-inventory-items.js
var items = {
// (A) HTML ITEMS LIST
list : async (toggle) => {
// (A1) GET ALL ITEMS
let all = await invDB.tx("getAll", "Items"),
hList = document.getElementById("itemList");
// (A2) DRAW HTML LIST
hList.innerHTML = "";
if (all.length==0) {
hList.innerHTML = "<div class='row'><div class='grow'>No items found</div></div>";
} else { for (let i of all) {
let row = document.createElement("div");
row.className = "row flex";
row.innerHTML =
`<div class="grow">
<div class="bold">[${i["sku"]}] ${i["name"]}</div>
Qty: ${i["qty"]}
</div>
<input type="button" value="&#x2716;" onclick="items.del('${i["sku"]}')">
<input type="button" value="&#x270E;" onclick="items.addEdit('${i["sku"]}')">
<input type="button" value="&#8634;" onclick="move.list('${i["sku"]}')">`;
hList.appendChild(row);
}}
if (toggle) { inv.pg("A"); }
},
// (B) DELETE ITEM
del : async (sku) => { if (confirm("Delete item?")) {
await invDB.tx("del", "Movement", IDBKeyRange.bound([sku, 0], [sku, Date.now()]));
await invDB.tx("del", "Items", sku);
items.list(true);
}},
// (C) ADD/EDIT ITEM
addEdit : async (sku) => {
// (C1) RESET FORM
document.getElementById("pgB").reset();
document.getElementById("itemOSKU").value = "";
// (C2) EDIT MODE
if (typeof sku == "string") {
let item = await invDB.tx("get", "Items", sku);
document.getElementById("itemOSKU").value = sku;
document.getElementById("itemSKU").value = item.sku;
document.getElementById("itemName").value = item.name;
}
// (C3) SWITCH PAGE
inv.pg("B");
},
// (D) SAVE ITEM
save : async () => {
// (D1) GET DATA FROM HTML FORM
let osku = document.getElementById("itemOSKU").value,
data = {
sku : document.getElementById("itemSKU").value,
name : document.getElementById("itemName").value,
qty : 0
};
// (D2) ADD NEW ITEM
if (osku=="") {
// (D2-1) CHECK IF ALREADY EXIST
if (await invDB.tx("get", "Items", data["sku"]) !== undefined) {
alert(`${data["sku"]} is already registered!`);
return;
}
// (D2-2) SAVE
await invDB.tx("put", "Items", data);
items.list(true);
}
// (D3) UPDATE ITEM
else {
// (D3-1) GET ITEM
let item = await invDB.tx("get", "Items", osku);
data["qty"] = item["qty"];
// (D3-2) JUST SAVE IF NOT CHANGING SKU
if (osku==data["sku"]) {
await invDB.tx("put", "Items", data);
items.list(true);
}
// (D3-3) HEADACHE IF CHANGING SKU
else {
// (D3-3-1) CHECK IF NEW SKU ALREADY REGISTERED
if (await invDB.tx("get", "Items", data["sku"]) !== undefined) {
alert(`${data["sku"]} is already registered!`);
return;
}
// (D3-3-2) ADD NEW SKU + DELETE OLD SKU
invDB.tx("put", "Items", data);
invDB.tx("del", "Items", osku);
// (D3-3-3) "UPDATE" SKU OF ALL MOVEMENT WITH PUT-DEL
let req = await invDB.tx("cursor", "Movement", IDBKeyRange.bound([osku, 0], [osku, Date.now()]));
req.onsuccess = e => {
const cursor = e.target.result;
if (cursor) {
// ERROR - CANNOT DIRECTLY CHANGE KEY. THUS THE "DUMB" PUT-DELETE WAY.
// cursor.update({ sku: NEW SKU });
let entry = cursor.value;
entry.sku = data["sku"];
invDB.tx("put", "Movement", entry);
cursor.delete();
cursor.continue();
} else { items.list(true); }
};
}
}
}
};
Raw
js-inventory-manifest.json
{
"short_name": "JS Inventory",
"name": "JS Inventory",
"icons": [{
"src": "images/favicon.png",
"sizes": "64x64",
"type": "image/png"
}, {
"src": "images/icon-512.png",
"sizes": "512x512",
"type": "image/png"
}],
"start_url": "js-inventory.html",
"scope": "/",
"background_color": "white",
"theme_color": "white",
"display": "standalone"
}
Raw
js-inventory-move.js
var move = {
// (A) HTML ITEM MOVEMENT LIST
list : async (sku) => {
// (A1) "PRESET" MOVEMENT FORM
document.getElementById("moveSKU").value = sku;
document.getElementById("moveDirection").value = "I";
document.getElementById("moveQty").value = 1;
// (A2) GET MOVEMENT
let all = await invDB.tx("getAll", "Movement", IDBKeyRange.bound([sku, 0], [sku, Date.now()])),
hList = document.getElementById("moveList"),
d = { "I" : "In", "O" : "Out", "T" : "Stock Take" };
// (A3) DRAW MOVEMENT
hList.innerHTML = "";
if (all.length == 0) {
hList.innerHTML = "<div class='row'><div class='grow'>No movement found</div></div>";
} else { for (let m of all) {
let row = document.createElement("div"),
date = new Date(m["date"]).toString();
row.className = "row flex";
row.innerHTML =
`<div class="grow">
<strong>${d[m["direction"]]}</strong><br>${date}
</div>
<div class="moveQty">${m["qty"]}</div>`;
hList.appendChild(row);
}}
inv.pg("C");
},
// (B) SAVE MOVEMENT
save : async () => {
// (B1) GET HTML FORM DATA
let data = {
sku: document.getElementById("moveSKU").value,
direction: document.getElementById("moveDirection").value,
qty: +document.getElementById("moveQty").value,
date: Date.now()
};
// (B2) GET ITEM
let item = await invDB.tx("get", "Items", data["sku"]);
// (B3) UPDATE QUANTITY
if (data["direction"] == "T") { item["qty"] = data["qty"]; }
else if (data["direction"] == "I") { item["qty"] += data["qty"]; }
else { item["qty"] -= data["qty"]; }
if (item["qty"] < 0) { data["qty"] = 0; }
await invDB.tx("put", "Items", item);
// (B4) ADD MOVEMENT
await invDB.tx("put", "Movement", data);
// (B5) DONE
move.list(data["sku"]);
items.list()
}
};
Raw
js-inventory-worker.js
// (A) CREATE/INSTALL CACHE
self.addEventListener("install", evt => {
self.skipWaiting();
evt.waitUntil(
caches.open("JSINV")
.then(cache => cache.addAll([
"js-inventory.css",
"js-inventory.html",
"js-inventory-db",
"js-inventory-db.js",
"js-inventory-items.js",
"js-inventory-move.js",
"js-inventory-manifest.json",
"images/favicon.png",
"images/icon-512.png"
]))
.catch(err => console.error(err))
);
});
// (B) CLAIM CONTROL INSTANTLY
self.addEventListener("activate", evt => self.clients.claim());
// (C) LOAD FROM CACHE FIRST, FALLBACK TO NETWORK IF NOT FOUND
self.addEventListener("fetch", evt => evt.respondWith(
caches.match(evt.request).then(res => res || fetch(evt.request))
));
Raw
js-inventory.css
/* (A) UNIVERSAL */
/* (A1) LAYOUT */
* {
font-family: Arial, Helvetica, sans-serif;
box-sizing: border-box;
}
body {
max-width: 600px;
margin: 0 auto;
padding: 15px;
}
.ninja { display: none; }
.flex {
display: flex;
align-items: stretch;
}
.grow { flex-grow: 1; }
.bold { font-weight: 700; }
/* (A2) ZEBRA STRIPE LIST */
.zebra .row:nth-child(odd) { background: #f2f2f2; }
.zebra .row { margin-top: 10px; }
.zebra input {
margin: 0;
padding: 0 15px;
font-size: 24px;
font-weight: 700;
color: #898989 !important;
background: transparent !important;
}
.zebra .grow { padding: 10px; }
/* (A3) FORM */
form {
padding: 20px;
background: #f2f2f2;
}
input, label, select {
display: block;
width: 100%;
margin-bottom: 10px;
}
input, select { padding: 10px; }
button, input[type=button], input[type=submit] {
width: auto;
border: 0;
color: #fff;
background: #a70000;
cursor: pointer;
}
#itemGo input, #mGo input {
margin: 1px;
width: 50%;
}
/* (B) ITEMS LIST */
#itemAdd {
padding: 15px 0;
margin-bottom: 10px;
color: #898989;
border: 2px dashed #aaa;
text-align: center;
font-size: 24px;
font-weight: 700;
cursor: pointer;
}
/* (C) MOVEMENT LIST */
.moveQty {
padding: 20px;
font-weight: 700;
font-size: 24px;
}
#moveBack {
width: 100%;
margin-top: 20px;
}
Raw
js-inventory.html
<!DOCTYPE html>
<html>
<head>
<!-- META -->
<title>JS Inventory Management</title>
<meta charset="utf-8">
<meta name="description" content="Experimental JS Inventory System">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.5">
<!-- ICONS -->
<link rel="icon" href="images/favicon.png" type="image/png">
<meta name="mobile-web-app-capable" content="yes">
<meta name="theme-color" content="white">
<link rel="apple-touch-icon" href="images/icon-512.png">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="JS Inventory">
<meta name="msapplication-TileImage" content="images/icon-512.png">
<meta name="msapplication-TileColor" content="#ffffff">
<!-- MANIFEST -->
<link rel="manifest" href="js-inventory-manifest.json">
<!-- INVENTORY CSS + JS -->
<link rel="stylesheet" href="js-inventory.css">
<script src="js-inventory-db.js"></script>
<script src="js-inventory-items.js"></script>
<script src="js-inventory-move.js"></script>
<script src="js-inventory.js"></script>
</head>
<body>
<!-- (A) PAGE A : ITEMS LIST -->
<div id="pgA" class="ninja">
<div id="itemAdd" onclick="items.addEdit()">+</div>
<div id="itemList" class="zebra"></div>
</div>
<!-- (B) PAGE B : ADD ITEM -->
<form id="pgB" class="ninja" onsubmit="items.save(); return false;">
<label>SKU</label>
<input type="hidden" id="itemOSKU">
<input type="text" required id="itemSKU">
<label>Name</label>
<input type="text" required id="itemName">
<div id="itemGo" class="flex">
<input type="button" value="Back" onclick="inv.pg('A')">
<input type="submit" value="Save">
</div>
</form>
<!-- (C) PAGE C : MOVEMENT -->
<div id="pgC" class="ninja">
<!-- (C1) MOVEMENT FORM -->
<form onsubmit="move.save(); return false;">
<label>SKU</label>
<input type="text" readonly id="moveSKU">
<label>Direction</label>
<select id="moveDirection">
<option value="I">In</option>
<option value="O">Out</option>
<option value="T">Stock Take</option>
</select>
<label>Quantity</label>
<input type="number" required id="moveQty">
<div id="mGo" class="flex">
<input type="button" value="Back" onclick="inv.pg('A')">
<input type="submit" value="Save">
</div>
</form>
<!-- (C2) MOVEMENT HISTORY -->
<div id="moveList" class="zebra"></div>
<input id="moveBack" type="button" value="Back" onclick="inv.pg('A')">
</div>
</body>
</html>
Raw
js-inventory.js
var inv = {
// (A) INITIALIZE APP
init : async () => {
// (A1) CHECK - INDEXED DATABASE SUPPORT
if (!IDB) {
alert("INDEXED DB IS NOT SUPPORTED ON THIS BROWSER!");
return;
}
// (A2) CHECK - SERVICE WORKER SUPPORT
if ("serviceWorker" in navigator) {
navigator.serviceWorker.register("js-inventory-worker.js");
} else {
alert("SERVICE WORKER IS NOT SUPPORTED ON THIS BROWSER!");
return;
}
// (A3) DATABASE + INTERFACE SETUP
if (await invDB.init()) { items.list(true); }
else {
alert("ERROR OPENING INDEXED DB!");
return;
}
},
// (B) TOGGLE PAGE
pg : p => { for (let i of ["A", "B", "C"]) {
if (p==i) {
document.getElementById("pg" + i).classList.remove("ninja");
} else {
document.getElementById("pg" + i).classList.add("ninja");
}
}},
// (X) RUN THIS IF YOU WANT DUMMY DEMO DATA
dummy : () => {
invDB.tx("put", "Items", { sku: "ABC123", name: "Foo Bar", qty: 123 });
invDB.tx("put", "Items", { sku: "BCD234", name: "Goo Bar", qty: 321 });
invDB.tx("put", "Items", { sku: "CDE345", name: "Hoo Bar", qty: 231 });
invDB.tx("put", "Items", { sku: "DEF456", name: "Joo Bar", qty: 213 });
invDB.tx("put", "Items", { sku: "EFG567", name: "Koo Bar", qty: 312 });
invDB.tx("put", "Movement", { sku: "ABC123", date: Date.now()-30000, direction: "T", qty: 123 });
invDB.tx("put", "Movement", { sku: "ABC123", date: Date.now()-20000, direction: "O", qty: 23 });
invDB.tx("put", "Movement", { sku: "ABC123", date: Date.now()-10000, direction: "O", qty: 32 });
invDB.tx("put", "Movement", { sku: "ABC123", date: Date.now(), direction: "I", qty: 55 });
}
};
window.addEventListener("DOMContentLoaded", inv.init);
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