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": "^_"
+        }
+      ]
+    }
   }
 );

src/routes/+layout.svelte

@@ -21,6 +21,7 @@
       <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/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;
+}