Added initial version.

js/00-functions.js

@@ -0,0 +1,41 @@
+// helper function to be able to change the event listener
+function updateState() {
+    states.search = this.value;
+}
+
+// checks if the pressed key equals to return key
+function updateStateOnReturnKey(e) {
+    if (e.keyCode === 13) {
+        updateState.call(this);
+    }
+}
+
+// removes the old event listener and applies the new one
+function changeEvent(newEvent) {
+    // remove the old listener
+    switch (states.event) {
+        case "onenterkey":
+            this.removeEventListener("keyup", updateStateOnReturnKey);
+            break;
+        default:
+            this.removeEventListener(states.event, updateState);
+            break;
+    }
+    states.event = newEvent;
+    // add the new listener
+    switch (newEvent) {
+        case "onenterkey":
+            this.addEventListener("keyup", updateStateOnReturnKey);
+            break;
+        default:
+            this.addEventListener(states.event, updateState);
+            break;
+    }
+}
+
+// updates the search field if the state does not match the value
+function updateSearchInput(state) {
+    if (this.value !== state) {
+        this.value = state;
+    }
+}