change text per #2; add validation per #1 plus limits; clean up vestigial code; update NPM packages

src/assets/base.css

@@ -65,3 +65,20 @@ input {
   background-color: #181818;
   color: white;
 }
+
+.alert-danger {
+  color: #842029;
+  background-color: #f8d7da;
+  border-color: #f5c2c7;
+}
+.alert {
+  position: relative;
+  padding: 1rem 1rem;
+  margin-bottom: 1rem;
+  border: 1px solid transparent;
+    border-top-color: transparent;
+    border-right-color: transparent;
+    border-bottom-color: transparent;
+    border-left-color: transparent;
+  border-radius: .25rem;
+}

src/stores/counter.ts

@@ -1,12 +0,0 @@
-import { ref, computed } from 'vue'
-import { defineStore } from 'pinia'
-
-export const useCounterStore = defineStore('counter', () => {
-  const count = ref(0)
-  const doubleCount = computed(() => count.value * 2)
-  function increment() {
-    count.value++
-  }
-
-  return { count, doubleCount, increment }
-})

src/views/HomeView.vue

@@ -9,9 +9,10 @@
     <p>Base Frequency (MHz): <input v-model="base" v-on:input="updateId"/></p>
     <p>Spacing (KHz): <input v-model="spacing" v-on:input="updateId"/></p>
     <p>Offset (MHz): <input v-model="offset" v-on:input="updateId"/></p>
-    <p>Channel ID (dec): <input v-model="id" v-on:input="updateDownlink"/> (0x{{ id.toString(16) }})</p>
+    <div class="alert alert-danger" v-show="invalid">Woah there! Your channel number is invalid! <br> Reason: {{ validation_message }}</div>
+    <p>Channel Number (dec): <input v-model="id" v-on:input="updateDownlink"/> (0x{{ id.toString(16) }})</p>
     <p>Uplink Frequency (MHz): <b>{{ uplink }}MHz</b></p>
-    <p class="footer-text">iden-calc-web V0.2 copyright &copy; 2023 Natalie Moore, Connor Lovell and the <a href="https://github.com/dvmproject">DVMProject</a> team.</p>
+    <p class="footer-text">iden-calc-web V0.2 copyright &copy; 2023, 2025 Natalie Moore, Connor Lovell and the <a href="https://github.com/dvmproject">DVMProject</a> team.</p>
   </main>
 </template>
 
@@ -27,6 +28,8 @@ export default defineComponent({
             base: 450 as number,
             spacing: 6.25 as number,
             offset: 5 as number,
+            invalid: 0 as number,
+            validation_message: "" as string,
         }
     },
     methods: {
@@ -34,7 +37,25 @@ export default defineComponent({
           var downlinkHz = this.downlink * 1000000
           var baseHz = this.base * 1000000
           var spacingHz = this.spacing * 1000
-          this.id = (downlinkHz - baseHz) / spacingHz
+          var new_id = (downlinkHz - baseHz) / spacingHz
+
+          if (new_id % 1 > 0) {
+            this.invalid = 1;
+            this.id = 0;
+            this.validation_message = "Fractional channel number: must be a whole number"
+          } else if (new_id > 4095) {
+            this.invalid = 1;
+            this.id = 0;
+            this.validation_message = "Too Large: channel number must be less than 4095 (0xFFF)"
+          } else if (new_id < 0) {
+            this.invalid = 1;
+            this.id = 0;
+            this.validation_message = "Too Small: channel number must be greater than zero"
+          } else {
+            this.invalid = 0;
+            this.id = new_id;
+          }
+
           this.uplink = (this.downlink * 1 + this.offset * 1)
         },
         async updateDownlink() {