GUI 5 - CRUD

eslint.config.js

@@ -5,6 +5,7 @@ import globals from 'globals';
 import { fileURLToPath } from 'node:url';
 import ts from 'typescript-eslint';
 import svelteConfig from './svelte.config.js';
+
 const gitignorePath = fileURLToPath(new URL("./.gitignore", import.meta.url));
 
 export default ts.config(
@@ -14,23 +15,32 @@ export default ts.config(
   ...svelte.configs.recommended,
   {
     languageOptions: {
-	  globals: {
-	    ...globals.browser,
-	    ...globals.node
-	  }
-	}
+      globals: {
+        ...globals.browser,
+        ...globals.node
+      }
+    }
   },
   {
     files: ["**/*.svelte", "**/*.svelte.ts", "**/*.svelte.js"],
     ignores: ["eslint.config.js", "svelte.config.js"],
 
     languageOptions: {
-	  parserOptions: {
-	    projectService: true,
-	    extraFileExtensions: ['.svelte'],
-	    parser: ts.parser,
-	    svelteConfig
-	  }
-	}
+      parserOptions: {
+        projectService: true,
+        extraFileExtensions: ['.svelte'],
+        parser: ts.parser,
+        svelteConfig
+      }
+    },
+    rules: {
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          "varsIgnorePattern": "^_",
+          "argsIgnorePattern": "^_"
+        }
+      ]
+    }
   }
 );

package.json

@@ -34,5 +34,8 @@
 		"onlyBuiltDependencies": [
 			"esbuild"
 		]
+	},
+	"dependencies": {
+		"date-fns": "^4.1.0"
 	}
 }

pnpm-lock.yaml

@@ -7,6 +7,10 @@ settings:
 importers:
 
   .:
+    dependencies:
+      date-fns:
+        specifier: ^4.1.0
+        version: 4.1.0
     devDependencies:
       '@eslint/compat':
         specifier: ^1.2.5
@@ -659,6 +663,9 @@ packages:
   daisyui@5.0.0:
     resolution: {integrity: sha512-U0K9Bac3Bi3zZGm6ojrw12F0vBHTpEgf46zv/BYxLe07hF0Xnx7emIQliwaRBgJuYhY0BhwQ6wSnq5cJXHA2yA==}
 
+  date-fns@4.1.0:
+    resolution: {integrity: sha512-Ukq0owbQXxa/U3EGtsdVBkR1w7KOQ5gIBqdH2hkvknzZPYvBxb/aa6E8L7tmjFtkwZBu3UXBbjIgPo/Ez4xaNg==}
+
   debug@4.4.0:
     resolution: {integrity: sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==}
     engines: {node: '>=6.0'}
@@ -1768,6 +1775,8 @@ snapshots:
 
   daisyui@5.0.0: {}
 
+  date-fns@4.1.0: {}
+
   debug@4.4.0:
     dependencies:
       ms: 2.1.3

src/routes/+layout.svelte

@@ -19,6 +19,9 @@
     <ul class="menu bg-base-200 text-base-content min-h-full w-80 p-4">
       <li><a href="/1_counter">1. Counter</a></li>
       <li><a href="/2_temperature_converter">2. Temperature Converter</a></li>
+      <li><a href="/3_flight_broker">3. Flight Broker</a></li>
+      <li><a href="/4_timer">4. Timer</a></li>
+      <li><a href="/5_crud">5. CRUD</a></li>
     </ul>
   </div>
 </div>

src/routes/3_flight_broker/+page.svelte

@@ -0,0 +1,51 @@
+<script lang="ts">
+  import { parse, format } from "date-fns";
+
+  const initialDate = format(new Date(), 'dd/MM/yyyy');
+  let flightType = $state("one-way");
+  let outbound = $state(initialDate);
+  let retflight = $state(initialDate);
+
+  function isValidDate(d: Date) {
+    return !Number.isNaN(d.getDate());
+  }
+
+  let outboundDate = $derived(parse(outbound, 'dd/MM/yyyy', new Date()));
+  let retflightDate = $derived(parse(retflight, 'dd/MM/yyyy', new Date()));
+  let outboundValid = $derived(isValidDate(outboundDate));
+  let retflightValid = $derived(isValidDate(retflightDate));
+
+  function isBookDisabled() {
+    const valid = outboundValid && (flightType === "return" ? retflightValid && retflightDate > outboundDate : true);
+    return !valid;
+  }
+
+  function onClickBook() {
+    switch (flightType) {
+      case "one-way":
+        alert(`You have booked a one-way flight on ${outbound}.`);
+        break;
+      case "return":
+        alert(`You have booked a return flight on ${outbound} and ${retflight}.`);
+        break;
+      default:
+        alert("Unknown Status");
+    }
+  }
+</script>
+
+<div class="flex flex-col items-center gap-4 w-80 mx-auto">
+  <select class="select" bind:value={flightType}>
+    <option value="one-way">One-way flight</option>
+    <option value="return">Return flight</option>
+  </select>
+  <label class={["input w-full", !outboundValid && "input-error"]}>
+    <span class="label">Outbound Flight</span>
+    <input type="text" placeholder="27/03/2025" bind:value={outbound}/>
+  </label>
+  <label class={["input w-full", flightType === 'return' && !retflightValid && "input-error"]}>
+    <span class="label">Return Flight</span>
+    <input type="text" placeholder="31/03/2025" bind:value={retflight} disabled={flightType !== 'return'}/>
+  </label>
+  <button class="btn btn-primary w-full" disabled={isBookDisabled()} onclick={onClickBook}>Book</button>
+</div>

src/routes/4_timer/+page.svelte

@@ -0,0 +1,32 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+
+  let duration = $state(300);
+  let elapsed = $state(0);
+  let elapsedSec = $derived((Math.min(elapsed, duration) / 10).toFixed(1));
+
+  onMount(() => {
+    const interval = setInterval(() => {
+      if (elapsed < duration) elapsed++;
+    }, 100);
+    return () => {
+      clearInterval(interval);
+    };
+  });
+</script>
+
+<div class="card card-border shadow-xl w-96 mx-auto">
+  <div class="card-body">
+    <h2 class="card-title">4. Timer</h2>
+    <div class="grid grid-cols-[min-content_auto] gap-2">
+      <p class="text-nowrap">Elapsed Time:</p>
+      <progress class="progress my-1 h-auto" value={elapsed} max={duration}></progress>
+      <p class="col-span-2">{elapsedSec}s</p>
+      <p>Duration:</p>
+      <input type="range" class="range range-xs" min="0" max="300" bind:value={duration}/>
+    </div>
+    <div class="card-actions">
+      <button class="btn btn-block btn-sm">Reset</button>
+    </div>
+  </div>
+</div>

src/routes/5_crud/+page.svelte

@@ -0,0 +1,79 @@
+<script lang="ts">
+  import type { AppState, Entry } from "./types";
+  // APP STATE
+  let appState: AppState = $state({
+    entries: {
+      "1": { name: "Hans", surname: "Wittenberg" },
+      "2": { name: "Max", surname: "Neumann" },
+      "3": { name: "Romano", surname: "Prodi" }
+    },
+    nextIndex: 4
+  });
+
+  function createEntry(entry: Entry) {
+    appState.entries[appState.nextIndex++] = entry; // Post-Increment! Yay!
+  }
+
+  function updateEntry(entryId: string, newEntry: Entry) {
+    appState.entries[entryId] = newEntry;
+  }
+
+  function deleteEntry(entryId: string) {
+    delete appState.entries[entryId];
+  }
+
+  let entryOptions = $derived(Object.entries(appState.entries).filter(([_, e]) => {
+    return e.name.includes(filterStr) || e.surname.includes(filterStr);
+  }));
+
+  // GUI STATE
+  let selectedId = $state("none");
+  let inputEntry: Entry = $state({ name: "", surname: "" });
+  let filterStr: string = $state("");
+</script>
+
+<div class="card card-border shadow-xl w-200 mx-auto">
+  <div class="card-body">
+    <h2 class="card-title">5. CRUD</h2>
+    <div class="grid grid-cols-2 gap-2">
+      <div class="inline-flex">
+        <span class="label text-nowrap mr-2">Filter prefix:</span>
+        <input type="text" class="input w-fill" bind:value={filterStr}/>
+      </div>
+      <p></p>
+      <div>
+        <span class="label">Surname, Name</span>
+        <select class="input h-auto cursor-auto w-full" size="10" bind:value={
+          () => selectedId,
+          (v) => {
+            selectedId = v;
+            inputEntry = $state.snapshot(appState.entries[v]); // BRUTTO RISCHIO!
+          }
+        }>
+          <option hidden value="none">None</option>
+          {#each entryOptions as [key, e] (key)}
+            <option value={key}>{e.surname}, {e.name}</option>
+          {/each}
+        </select>
+      </div>
+      <div class="grid grid-cols-[min-content_auto] gap-2 mb-auto">
+        <span class="label">Name:</span>
+        <input class="input" type="text" bind:value={inputEntry.name}/>
+        <span class="label">Surname:</span>
+        <input class="input" type="text" bind:value={inputEntry.surname}/>
+      </div>
+    </div>
+    <div class="card-actions">
+      <button class="btn btn-primary" onclick={() => createEntry(inputEntry)}>
+        Create
+      </button>
+      <button class="btn btn-warning" disabled={selectedId === "none"}
+              onclick={() => updateEntry(selectedId, inputEntry)}>
+        Update
+      </button>
+      <button class="btn btn-error" disabled={selectedId === "none"} onclick={() => deleteEntry(selectedId)}>
+        Delete
+      </button>
+    </div>
+  </div>
+</div>

src/routes/5_crud/types.ts

@@ -0,0 +1,13 @@
+export interface Entry {
+  name: string,
+  surname: string,
+}
+
+export interface DB {
+  [entryId: string]: Entry;
+}
+
+export type AppState = {
+  entries: DB;
+  nextIndex: number;
+}