dialog_widget: Remove is_confirm_dialog variable.

Making the controls declarative makes the system more flexible for
future use cases.

static/js/confirm_dialog.js

@@ -1,10 +1,13 @@
-import {$t_html} from "./i18n";
 import * as dialog_widget from "./dialog_widget";
+import {$t_html} from "./i18n";
 
 export function launch(conf) {
-    dialog_widget.launch(
-        {...conf,
-         html_submit_button: $t_html({defaultMessage: "Confirm"}),
-         is_confirm_dialog: true,
-        });
+    dialog_widget.launch({
+        ...conf,
+        close_on_submit: true,
+        danger_submit_button: true,
+        focus_submit_on_open: true,
+        html_submit_button: $t_html({defaultMessage: "Confirm"}),
+        // Used to control button colors in the template.
+    });
 }

static/js/dialog_widget.js

@@ -62,9 +62,6 @@ export function show_dialog_spinner() {
 }
 
 export function launch(conf) {
-    const html = render_dialog_widget({fade: conf.fade, is_confirm_dialog: conf.is_confirm_dialog});
-    const dialog = $(html);
-
     const mandatory_fields = [
         // The html_ fields should be safe HTML. If callers
         // interpolate user data into strings, they should use
@@ -75,12 +72,25 @@ export function launch(conf) {
         "parent",
     ];
 
+    // Optional parameters:
+    // * html_submit_button: Submit button text.
+    // * close_on_submit: Whether to close modal on clicking submit.
+    // * focus_submit_on_open: Whether to focus submit button on open.
+    // * danger_submit_button: Whether to use danger button styling for submit button.
+    // * help_link: A help link in the heading area.
+
     for (const f of mandatory_fields) {
         if (conf[f] === undefined) {
             blueslip.error("programmer omitted " + f);
         }
     }
 
+    const html = render_dialog_widget({
+        fade: conf.fade,
+        danger_submit_button: conf.danger_submit_button,
+    });
+    const dialog = $(html);
+
     conf.parent.append(dialog);
 
     // Close any existing modals--on settings screens you can
@@ -99,7 +109,7 @@ export function launch(conf) {
 
     const submit_button_span = dialog.find(".dialog_submit_button span");
 
-    let html_submit_button = conf.html_submit_button || $t_html({defaultMessage: "Save changes"});
+    const html_submit_button = conf.html_submit_button || $t_html({defaultMessage: "Save changes"});
     submit_button_span.html(html_submit_button);
 
     if (conf.post_render !== undefined) {
@@ -111,7 +121,7 @@ export function launch(conf) {
     submit_button.on("click", () => {
         if (conf.loading_spinner) {
             show_dialog_spinner();
-        } else if (conf.is_confirm_dialog) {
+        } else if (conf.close_on_submit) {
             overlays.close_modal("#dialog_widget_modal");
         }
         conf.on_click();
@@ -124,7 +134,7 @@ export function launch(conf) {
     // Open the modal
     overlays.open_modal("#dialog_widget_modal");
 
-    if (conf.is_confirm_dialog) {
+    if (conf.focus_submit_on_open) {
         conf.parent.on("shown.bs.modal", () => {
             submit_button.trigger("focus");
         });

static/templates/dialog_widget.hbs

@@ -8,7 +8,7 @@
     </div>
     <div class="modal-footer">
         <button class="button rounded close-modal-btn" data-dismiss="modal">{{t "Cancel" }}</button>
-        <button class="button rounded {{#if is_confirm_dialog}}btn-danger{{else}}sea-green{{/if}} dialog_submit_button">
+        <button class="button rounded {{#if danger_submit_button}}btn-danger{{else}}sea-green{{/if}} dialog_submit_button">
             <object class="loader" type="image/svg+xml" data="/static/images/loader.svg"></object>
             <span></span>
         </button>