ENH: Add function for creating a form modal HTML element

src/core/js/form_elements.js

@@ -1563,6 +1563,37 @@ var form_elements = new function () {
         }
     }
 
+    /**
+     * Return a modal HTML element containing the given form.
+     *
+     * @param {HTMLElement} form - the form to be shown in the modal
+     * @param {string} title - the title of the form modal
+     * @param {string} explanation_text - An optional paragraph shown between
+     *                                    modal title and form.
+     */
+    this.make_for_modal = function (form, title, explanation_text) {
+        const modal = $(`
+              <div class="modal fade" tabindex="-1" role="dialog">
+                <div class="modal-dialog" role="document">
+                  <div class="modal-content">
+                    <div class="modal-header">
+                      <h4 class="modal-title">${title}</h4>
+                      <p>{explanation_text}</p>
+                      <button type="button"
+                        class="btn-close"
+                        data-bs-dismiss="modal"
+                        aria-label="Close">
+                      </button>
+                    </div>
+                    <div class="modal-body">
+                    </div>
+                  </div>
+                </div>`);
+
+        modal.find(".modal-body").append(form);
+        return modal[0];
+    }
+
 
     /**
      * Return an input and a label, wrapped in a div with class