docs: add modifying menu documentation

#3305

docs/en/UI/Angular/Modifying-the-Menu.md

@@ -0,0 +1,207 @@
+## Modifying the Menu
+
+The menu is inside of the `ApplicationLayoutComponent` that is in the @abp/ng.theme.basic package. There are several methods to modify the menu elements. This document covers these methods. If you would like to replace all menu. Please refer to [Component Replacement documentation](./Component-Replacement.md) to learn how to replace a layout.
+
+
+<!-- TODO: Replace layout replacement document with component replacement. Layout replacement document will be created.-->
+
+
+### How to Add Logo
+
+`logoUrl` property in environment is the url of the logo. 
+
+You can add your logo to `src/assets` folder and set the `logoUrl` as shown below:
+
+```js
+export const environment = {
+  // other configurations
+  application: {
+    name: 'MyProjectName',
+    logoUrl: 'assets/logo.png',
+  },
+  // other configurations
+};
+```
+
+### How to Add a Navigation Element
+
+#### Via `routes` object in the `AppRoutingModule`
+
+You can define your routes by adding the `routes` object to the `data` object of a route in the `app-routing.module`. The `@abp/ng.core` package organizes your routes and stores them in the `ConfigState`. `ApplicationLayoutComponent` gets routes and displays on the menu.
+
+You can add `routes` object like below:
+
+```js
+import { ABP } from '@abp/ng.core';
+{
+// ...
+  path: 'your-path',
+  data: {
+    routes: {
+      name: 'Your navigation',
+      order: 3,
+      iconClass: 'fas fa-question-circle',
+      requiredPolicy: 'permission key here',
+      children: [
+        {
+          path: 'child',
+          name: 'Your child navigation',
+          order: 1,
+          requiredPolicy: 'permission key here',
+        },
+      ],
+    } as ABP.Route,
+  }
+}
+```
+
+- `name` is the label of navigation element. A localization key or localization object can be passed.
+- `order` is order of the navigation element.
+- `iconClass` is the class of the `i` tag, which is placed to the left of the navigation label.
+- `requiredPolicy` is the permission key to access the page. See the [Permission Management document](./Permission-Management.md)
+- `children` is an array that child navigation elements are able to declare. The `path` property in an element of children array will be placed as a child route. Its url will be set as `'/your-path/child'`.
+
+After adding the routes object above, the navigation menu looks like this:
+
+![navigation-menu-via-app-routing](./images/navigation-menu-via-app-routing.png)
+
+#### Via ConfigState
+
+The `dispatchAddRoute` method of `ConfigStateService` adds a new navigation element to the menu.
+
+```js
+// this.config is instance of ConfigStateService
+
+const newRoute: ABP.Route = {
+    name: 'My New Page',
+    iconClass: 'fa fa-dashboard',
+    path: 'page',
+    invisible: false,
+    order: 2,
+    requiredPolicy: 'MyProjectName.MyNewPage',
+  } as Omit<ABP.Route, 'children'>;
+
+  this.config.dispatchAddRoute(newRoute);
+// returns a state stream which emits after dispatch action is complete
+```
+
+The `newRoute` will be placed as at root level, i.e. without any parent routes and its url will be stored as `'/path'`.
+
+If you want **to add a child route, you can do this:**
+
+```js
+import { ConfigStateService } from '@abp/ng.core';
+import { eIdentityRouteNames } from '@abp/ng.identity';
+
+constructor(private config: ConfigStateService) {}
+
+const newRoute: ABP.Route = {
+  parentName: eIdentityRouteNames.IdentityManagement,
+  name: 'My New Page',
+  iconClass: 'fa fa-dashboard',
+  path: 'page',
+  invisible: false,
+  order: 3,
+  requiredPolicy: 'MyProjectName.MyNewPage'
+} as Omit<ABP.Route, 'children'>;
+
+this.config.dispatchAddRoute(newRoute);
+// returns a state stream which emits after dispatch action is complete
+```
+
+The `newRoute` will then be placed as a child of the parent route named `eIdentityRouteNames.IdentityManagement` and its url will be set as `'/identity/page'`.
+
+The new route will be added like below:
+
+![navigation-menu-via-config-state](./images/navigation-menu-via-config-state.png)
+
+### How to Patch a Navigation Element
+
+The `dispatchPatchRouteByName` finds a route by its name and replaces its configuration in the `Store` with the new configuration passed as the second parameter.
+
+```js
+import { ConfigStateService } from '@abp/ng.core';
+import { eIdentityRouteNames } from '@abp/ng.identity';
+
+constructor(private config: ConfigStateService) {}
+
+const newRouteConfig: Partial<ABP.Route> = {
+  iconClass: 'fas fa-home',
+  parentName: eIdentityRouteNames.Administration,
+  order: 0,
+  children: [
+    {
+      name: 'Dashboard',
+      path: 'dashboard',
+    },
+  ],
+};
+
+this.config.dispatchPatchRouteByName('::Menu:Home', newRouteConfig);
+// returns a state stream which emits after dispatch action is complete
+```
+
+* Moved the home navigation to under the _Administration_ dropdown by passing `parentName`.
+* Added an icon.
+* Specified the order.
+* Added a child route named _Dashboard_
+
+After the patching above, navigation elements looks like below:
+
+![navigation-menu-after-patching](./images/navigation-menu-after-patching.png)
+
+
+### How to Add an Element to Right Part of the Menu
+
+The right part elements are stored in the `LayoutState` that is in the @abp/ng.theme.basic package.
+
+The `dispatchAddNavigationElement` method of the `LayoutStateService` adds an element to the right part of the menu. 
+
+You can add an element by adding your template to `app.component` and call the `dispatchAddNavigationElement` method:
+
+```js
+import { Layout, LayoutStateService } from '@abp/ng.theme.basic'; // added this line
+
+@Component({
+  selector: 'app-root',
+  template: `
+  
+    <!-- Added below content -->
+    <ng-template #search
+      ><input type="search" placeholder="Search" class="bg-transparent border-0"
+    /></ng-template>
+  `,
+})
+export class AppComponent {
+  // Added ViewChild
+  @ViewChild('search', { static: false, read: TemplateRef }) searchElementRef: TemplateRef<any>;
+
+  constructor(private layout: LayoutStateService) {} // injected LayoutStateService
+
+// Added ngAfterViewInit
+  ngAfterViewInit() {
+    const newElement = {
+      name: 'Search',
+      element: this.searchElementRef,
+      order: 1,
+    } as Layout.NavigationElement;
+
+    this.layout.dispatchAddNavigationElement(newElement);
+  }
+}
+```
+
+We added the search input to the menu.
+
+The final UI looks like below:
+
+![navigation-menu-search-input](./images/navigation-menu-search-input.png)
+
+### How to Remove an Element From Right Part of the Menu
+
+TODO
+
+
+## What's Next
+
+* [Component Replacement](./Component-Replacement.md)

docs/en/docs-nav.json

@@ -352,6 +352,10 @@
               "text": "Config State",
               "path": "UI/Angular/Config-State.md"
             },
+            {
+              "text": "Modifying the Menu",
+              "path": "UI/Angular/Modifying-the-Menu.md"
+            },
             {
               "text": "Component Replacement",
               "path": "UI/Angular/Component-Replacement.md"
@@ -398,7 +402,7 @@
       "text": "Data Access",
       "items": [
         {
-          "text": "Overall", 
+          "text": "Overall",
           "path": "Data-Access.md"
         },
         {