Add missing JS

src/registrar/assets/js/dja-collapse.js

@@ -0,0 +1,45 @@
+/*
+ * We will run our own version of
+ * https://github.com/django/django/blob/195d885ca01b14e3ce9a1881c3b8f7074f953736/django/contrib/admin/static/admin/js/collapse.js
+ * Works with our fieldset override
+*/
+
+/*global gettext*/
+'use strict';
+{
+    window.addEventListener('load', function() {
+        // Add anchor tag for Show/Hide link
+        const fieldsets = document.querySelectorAll('fieldset.collapse--dotgov');
+        for (const [i, elem] of fieldsets.entries()) {
+            // Don't hide if fields in this fieldset have errors
+            if (elem.querySelectorAll('div.errors, ul.errorlist').length === 0) {
+                elem.classList.add('collapsed');
+                const button = elem.querySelector('button');
+                button.id = 'fieldsetcollapser' + i;
+                button.className = 'collapse-toggle--dotgov usa-button usa-button--unstyled';
+            }
+        }
+        // Add toggle to hide/show anchor tag
+        const toggleFuncDotgov = function(e) {
+            e.preventDefault();
+            e.stopPropagation();
+            const fieldset = this.closest('fieldset');
+            const spanElement = this.querySelector('span');
+            const useElement = this.querySelector('use');
+            if (fieldset.classList.contains('collapsed')) {
+                // Show
+                spanElement.textContent = 'Hide details';
+                useElement.setAttribute('xlink:href', '/public/img/sprite.svg#expand_less');
+                fieldset.classList.remove('collapsed');
+            } else {
+                // Hide
+                spanElement.textContent = 'Show details';
+                useElement.setAttribute('xlink:href', '/public/img/sprite.svg#expand_more');
+                fieldset.classList.add('collapsed');
+            }
+        };
+        document.querySelectorAll('.collapse-toggle--dotgov').forEach(function(el) {
+            el.addEventListener('click', toggleFuncDotgov);
+        });
+    });
+}