Update query-selection logic

Remove support for array ingestion and update string binding to
query-select all.

README.md

@@ -56,22 +56,16 @@ See the [documentation](http://grafluxe.com/o/doc/dropdownizer/Dropdownizer.html
 
 ## Examples
 
-Pass in a `string` to quickly bind to the *first found*  element.
+Pass in a `string` to bind to the matching element(s).
 
 ```
-new Dropdownizer("#my-dd");
+new Dropdownizer("select");
 ```
 
-Pass in an `array` to quickly bind to the *first found* elements.
+Pass in an `DOM element` to bind to the matching element(s).
 
 ```
-new Dropdownizer(["#my-dd", ".dropdown"]);
-```
-
-Pass in an `DOM element` to bind to the returned element(s).
-
-```
-new Dropdownizer(document.querySelectorAll("select"));
+new Dropdownizer(document.querySelector("select"));
 ```
 
 Use the `change` method.

example/index.html

@@ -39,7 +39,7 @@ <h1>Dropdownizer Examples</h1>
   </section>
   <script src="../dist/Dropdownizer.min.js"></script>
   <script>
-    new Dropdownizer(document.querySelectorAll("select")).change(evt => {
+    new Dropdownizer("select").change(evt => {
       document.querySelector("#selection").innerHTML = evt.data.label || evt.data.value;
     });
   </script>

src/Dropdownizer.js

@@ -10,24 +10,26 @@ class Dropdownizer {
     let dds = [];
 
     if (typeof el === "string") {
-      el = document.querySelector(el);
-    } else if(el instanceof Array) {
-      el = el.map(element => document.querySelector(element));
+      el = document.querySelectorAll(el);
     }
 
     if (!el) {
       throw new Error("No such element exists.");
     }
 
-    if (el.nodeType) {
-      dds.push(new Dropdownize(el));
-    } else {
-      el.forEach(element => {
-        dds.push(new Dropdownize(element));
-      });
-    }
+    try {
+      if (el.nodeType) {
+        dds.push(new Dropdownize(el));
+      } else {
+        el.forEach(element => {
+          dds.push(new Dropdownize(element));
+        });
+      }
 
-    this._dropdowns = Object.freeze(dds);
+      this._dropdowns = Object.freeze(dds);
+    } catch (err) {
+      throw new TypeError("Unexpected argument.");
+    }
   }
 
   selectItem(index) {