Split up static files into static and django_static

static/js/custom_number_input.js

@@ -0,0 +1,23 @@
+(() => {
+    document.addEventListener("DOMContentLoaded", () => {
+        // get all customnumberinput Elements
+        let customNumberInputElements = document.getElementsByClassName("customnumberinput");
+        // Add Event Handler to the elements of the customnumberinputs
+        [...customNumberInputElements].forEach(element => {
+            // number input
+            let numberFieldElement = element.getElementsByClassName("customnumberinput-field")[0];
+            // minus button
+            element.getElementsByClassName("customnumberinput-minus")[0].addEventListener("click", () => alterCustomNumberField(numberFieldElement, -1));
+            // plus button
+            element.getElementsByClassName("customnumberinput-plus")[0].addEventListener("click", () => alterCustomNumberField(numberFieldElement, +1));
+        })
+    })
+    function alterCustomNumberField(numberFieldElement, n) {
+        numberFieldElement.value = Math.min(
+            Math.max(
+                (parseInt(numberFieldElement.value) + n), numberFieldElement.min || Number.MIN_VALUE
+            ),
+            numberFieldElement.max || Number.MAX_VALUE
+        );
+    }
+})();