Better trigger create

main.go

@@ -137,6 +137,7 @@ func main() { // {{{
 	service.Register("/datapoint/values/{id}", false, false, pageDatapointValues)
 
 	service.Register("/triggers", false, false, pageTriggers)
+	service.Register("/trigger/create/{sectionID}/{name}", false, false, triggerCreate)
 	service.Register("/trigger/edit/{id}", false, false, pageTriggerEdit)
 	service.Register("/trigger/edit/{id}/{sectionID}", false, false, pageTriggerEdit)
 	service.Register("/trigger/addDatapoint/{id}/{datapointName}", false, false, pageTriggerDatapointAdd)
@@ -672,6 +673,38 @@ func pageTriggers(w http.ResponseWriter, _ *http.Request, _ *session.T) { // {{{
 
 	page.Render(w)
 } // }}}
+func triggerCreate(w http.ResponseWriter, r *http.Request, _ *session.T) { // {{{
+	name := r.PathValue("name")
+	sectionIDStr := r.PathValue("sectionID")
+	sectionID, err := strconv.Atoi(sectionIDStr)
+	if err != nil {
+		httpError(w, werr.Wrap(err).WithData(sectionIDStr).Log())
+		return
+	}
+
+	t, err := TriggerCreate(sectionID, name)
+	if err != nil {
+		httpError(w, werr.Wrap(err).WithData(struct {
+			SectionID int
+			Name      string
+		}{
+			sectionID,
+			name,
+		}).Log())
+		return
+	}
+
+	resp := struct {
+		OK bool
+		Trigger Trigger
+	}{
+		true,
+		t,
+	}
+	j, _ := json.Marshal(resp)
+	w.Header().Add("Content-Type", "application/json")
+	w.Write(j)
+} // }}}
 func pageTriggerEdit(w http.ResponseWriter, r *http.Request, _ *session.T) { // {{{
 	idStr := r.PathValue("id")
 	id, err := strconv.Atoi(idStr)

trigger.go

@@ -7,6 +7,7 @@ import (
 	"github.com/lib/pq"
 
 	// Standard
+	"database/sql"
 	"encoding/json"
 	"fmt"
 	"strings"
@@ -20,6 +21,13 @@ type Trigger struct {
 	Datapoints []string
 }
 
+func TriggerCreate(sectionID int, name string) (t Trigger, err error) { // {{{
+	t.SectionID = sectionID
+	t.Name = name
+	t.Expression = "false"
+	err = t.Update()
+	return
+} // }}}
 func TriggersRetrieve() (areas []Area, err error) { // {{{
 	areas = []Area{}
 
@@ -137,15 +145,34 @@ func (t *Trigger) Update() (err error) { // {{{
 	}
 	jsonDatapoints, _ := json.Marshal(t.Datapoints)
 	if t.ID == 0 {
-		_, err = service.Db.Conn.Exec(`
+		var row *sql.Row
+		row = service.Db.Conn.QueryRow(`
 			INSERT INTO "trigger"(name, section_id, expression, datapoints)
 			VALUES($1, $2, $3, $4)
+			RETURNING id
 			`,
 			t.Name,
 			t.SectionID,
 			t.Expression,
 			jsonDatapoints,
 		)
+		err = row.Scan(&t.ID)
+		if err != nil {
+			err = we.Wrap(err).WithData(
+				struct {
+					SectionID      int
+					Name           string
+					Expression     string
+					JsonDataPoints []byte
+				}{
+					t.SectionID,
+					t.Name,
+					t.Expression,
+					jsonDatapoints,
+				},
+			)
+			return
+		}
 	} else {
 		_, err = service.Db.Conn.Exec(`
 			UPDATE "trigger"

views/pages/triggers.gotmpl

@@ -3,6 +3,29 @@
 	{{ block "page_label" . }}{{end}}
 	{{ $version := .VERSION }}
 
+	<script type="text/javascript">
+		function createTrigger(sectionID) {
+			let name = prompt("Trigger name")
+			if (name === null)
+				return
+
+			if (name.trim() == "") {
+				alert('A name is required')
+				return
+			}
+
+			fetch(`/trigger/create/${sectionID}/${encodeURIComponent(name)}`)
+			.then(data=>data.json())
+			.then(json=>{
+					if (!json.OK) {
+						alert(json.Error)
+						return
+					}
+					location.href = `/trigger/edit/${json.Trigger.ID}`
+			})
+		}
+	</script>
+
 	<div id="areas">
 		{{ range .Data.Areas }}
 		<div class="area">
@@ -11,7 +34,7 @@
 			<div class="section">
 				<div class="create">
 					<div class="name">{{ .Name }}</div>
-					<div class="new"><a href="/trigger/edit/0/{{ .ID }}">+</a></div>
+					<div class="new"><a onclick="createTrigger({{ .ID }})">+</a></div>
 				</div>
 
 				<div class="triggers">