Put new invoice and edit invoice forms into a dialog

In this case i have to use the same id for the dialog content in all
pages because, for now, there are a couple of forms that need to replace
it on submit—the new/edit form and the product selection form.

Unfortunately, HTMx does not have support for `formaction` attribute at
this point, so i had to use the workaround described in [0].

[0] https://github.com/bigskysoftware/htmx/issues/623

pkg/invoices.go

@@ -393,7 +393,7 @@ func mustRenderNewInvoiceForm(w http.ResponseWriter, r *http.Request, form *invo
 	locale := getLocale(r)
 	form.Customer.EmptyLabel = gettext("Select a customer to bill.", locale)
 	page := newNewInvoicePage(form, r)
-	mustRenderAppTemplate(w, r, "invoices/new.gohtml", page)
+	mustRenderModalTemplate(w, r, "invoices/new.gohtml", page)
 }
 
 func mustRenderNewInvoiceProductsForm(w http.ResponseWriter, r *http.Request, action string, form *invoiceForm) {
@@ -404,7 +404,7 @@ func mustRenderNewInvoiceProductsForm(w http.ResponseWriter, r *http.Request, ac
 		Form:     form,
 		Products: mustGetProductChoices(r.Context(), conn, company),
 	}
-	mustRenderAppTemplate(w, r, "invoices/products.gohtml", page)
+	mustRenderModalTemplate(w, r, "invoices/products.gohtml", page)
 }
 
 func mustGetProductChoices(ctx context.Context, conn *Conn, company *Company) []*productChoice {
@@ -457,8 +457,14 @@ func HandleAddInvoice(w http.ResponseWriter, r *http.Request, _ httprouter.Param
 		return
 	}
 	slug := conn.MustGetText(r.Context(), "", "select add_invoice($1, $2, $3, $4, $5, $6, $7, $8)", company.Id, form.Number, form.Date, form.Customer, form.Notes, form.PaymentMethod, form.Tags, NewInvoiceProductArray(form.Products))
+	if IsHTMxRequest(r) {
+		w.Header().Set("HX-Trigger", "closeModal")
+		w.Header().Set("HX-Refresh", "true")
+		w.WriteHeader(http.StatusNoContent)
+	} else {
 		http.Redirect(w, r, companyURI(company, "/invoices/"+slug), http.StatusSeeOther)
 	}
+}
 
 func HandleNewInvoiceAction(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
 	switch params[0].Value {
@@ -832,7 +838,12 @@ func HandleUpdateInvoice(w http.ResponseWriter, r *http.Request, params httprout
 		if slug == "" {
 			http.NotFound(w, r)
 		}
+		if IsHTMxRequest(r) {
+			w.Header().Set("HX-Refresh", "true")
+			w.WriteHeader(http.StatusNoContent)
+		} else {
 			http.Redirect(w, r, companyURI(mustGetCompany(r), "/invoices"), http.StatusSeeOther)
+		}
 	} else {
 		slug := params[0].Value
 		if !form.Validate() {
@@ -845,9 +856,15 @@ func HandleUpdateInvoice(w http.ResponseWriter, r *http.Request, params httprout
 			http.NotFound(w, r)
 			return
 		}
+		if IsHTMxRequest(r) {
+			w.Header().Set("HX-Trigger", "closeModal")
+			w.Header().Set("HX-Refresh", "true")
+			w.WriteHeader(http.StatusNoContent)
+		} else {
 			http.Redirect(w, r, companyURI(company, "/invoices/"+slug), http.StatusSeeOther)
 		}
 	}
+}
 
 func ServeEditInvoice(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
 	conn := getConn(r)
@@ -879,7 +896,7 @@ func newEditInvoicePage(slug string, form *invoiceForm, r *http.Request) *editIn
 
 func mustRenderEditInvoiceForm(w http.ResponseWriter, r *http.Request, slug string, form *invoiceForm) {
 	page := newEditInvoicePage(slug, form, r)
-	mustRenderAppTemplate(w, r, "invoices/edit.gohtml", page)
+	mustRenderModalTemplate(w, r, "invoices/edit.gohtml", page)
 }
 
 func HandleEditInvoiceAction(w http.ResponseWriter, r *http.Request, params httprouter.Params) {

web/static/numerus.js

@@ -421,6 +421,19 @@ htmx.onLoad((target) => {
     }
 })
 
+htmx.on('htmx:configRequest', function(e) {
+    const element = e.detail.elt;
+    if (element && element.nodeName === 'FORM') {
+        let submitter = e.detail.triggeringEvent.submitter;
+        if (submitter) {
+            const action = submitter.attributes['formaction'];
+            if (action && action.value) {
+                e.detail.path = action.value;
+            }
+        }
+    }
+})
+
 htmx.on('closeModal', () => {
     const openDialog = document.querySelector('dialog[open]');
     if (!openDialog) {

web/template/invoices/edit.gohtml

@@ -15,9 +15,9 @@
 
 {{ define "content" }}
     {{- /*gotype: dev.tandem.ws/tandem/numerus/pkg.editInvoicePage*/ -}}
-    <section class="dialog-content">
+    <section class="dialog-content" id="invoice-dialog-content" data-hx-target="this">
         <h2>{{ printf (pgettext "Edit Invoice “%s”" "title") .Number }}</h2>
-        <form method="POST" action="{{ companyURI "/invoices/" }}{{ .Slug }}">
+        <form method="POST" action="{{ companyURI "/invoices/" }}{{ .Slug }}" data-hx-boost="true" data-hx-select="#invoice-dialog-content">
             {{ csrfToken }}
 
             {{ with .Form -}}

web/template/invoices/index.gohtml

@@ -17,6 +17,7 @@
                         name="action" value="download"
                 >{{( pgettext "Download invoices" "action" )}}</button>
                 <a class="primary button"
+                   data-hx-push-url="false" data-hx-swap="beforeend" data-hx-boost="true"
                    href="{{ companyURI "/invoices/new" }}">{{( pgettext "New invoice" "action" )}}</a>
             </p>
         </form>
@@ -68,7 +69,7 @@
                     <td>
                         <details class="invoice-status menu">
                             <summary class="invoice-status-{{ .Status }}">{{ .StatusLabel }}</summary>
-                            <form action="{{companyURI "/invoices/"}}{{ .Slug }}" method="POST">
+                            <form action="{{companyURI "/invoices/"}}{{ .Slug }}" method="POST" data-hx-boost="true">
                                 {{ csrfToken }}
                                 {{ putMethod }}
                                 <input type="hidden" name="quick" value="status">
@@ -104,7 +105,9 @@
                             <summary><i class="ri-more-line"></i></summary>
                             <ul role="menu" class="action-menu">
                                 <li role="presentation">
-                                    <a role="menuitem" href="{{ companyURI "/invoices"}}/{{ .Slug }}/edit">
+                                    <a role="menuitem" href="{{ companyURI "/invoices"}}/{{ .Slug }}/edit"
+                                       data-hx-push-url="false" data-hx-swap="beforeend" data-hx-boost="true"
+                                    >
                                         <i class="ri-edit-line"></i>
                                         {{( pgettext "Edit" "action" )}}
                                     </a>

web/template/invoices/new.gohtml

@@ -15,9 +15,9 @@
 
 {{ define "content" }}
     {{- /*gotype: dev.tandem.ws/tandem/numerus/pkg.newInvoicePage*/ -}}
-    <section class="dialog-content">
+    <section class="dialog-content" id="invoice-dialog-content" data-hx-target="this">
         <h2>{{(pgettext "New Invoice" "title")}}</h2>
-        <form method="POST" action="{{ companyURI "/invoices" }}">
+        <form method="POST" action="{{ companyURI "/invoices" }}" data-hx-boost="true" data-hx-select="#invoice-dialog-content">
             {{ csrfToken }}
 
             {{ with .Form -}}

web/template/invoices/products.gohtml

@@ -19,9 +19,9 @@
 
 {{ define "content" }}
     {{- /*gotype: dev.tandem.ws/tandem/numerus/pkg.newInvoiceProductsPage*/ -}}
-    <section class="dialog-content">
+    <section class="dialog-content" id="invoice-dialog-content" data-hx-target="this">
         <h2>{{(pgettext "Add Products to Invoice" "title")}}</h2>
-        <form method="POST" action="{{ .Action }}">
+        <form method="POST" action="{{ .Action }}" data-hx-boost="true" data-hx-select="#invoice-dialog-content">
             {{ csrfToken }}
 
             {{- with .Form }}