fix(overlay): error when rendering flexible overlay on the server

src/cdk/overlay/position/connected-position-strategy.ts

@@ -19,6 +19,7 @@ import {
 } from './connected-position';
 import {FlexibleConnectedPositionStrategy} from './flexible-connected-position-strategy';
 import {PositionStrategy} from './position-strategy';
+import {Platform} from '@angular/cdk/platform';
 
 
 /**
@@ -60,14 +61,16 @@ export class ConnectedPositionStrategy implements PositionStrategy {
       overlayPos: OverlayConnectionPosition,
       connectedTo: ElementRef,
       viewportRuler: ViewportRuler,
-      document: Document) {
+      document: Document,
+      // @deletion-target 7.0.0 `platform` parameter to be made required.
+      platform?: Platform) {
 
     // Since the `ConnectedPositionStrategy` is deprecated and we don't want to maintain
     // the extra logic, we create an instance of the positioning strategy that has some
     // defaults that make it behave as the old position strategy and to which we'll
     // proxy all of the API calls.
     this._positionStrategy =
-      new FlexibleConnectedPositionStrategy(connectedTo, viewportRuler, document)
+      new FlexibleConnectedPositionStrategy(connectedTo, viewportRuler, document, platform)
         .withFlexibleDimensions(false)
         .withPush(false)
         .withViewportMargin(0);

src/cdk/overlay/position/flexible-connected-position-strategy.ts

@@ -20,6 +20,7 @@ import {Observable, Subscription, Subject} from 'rxjs';
 import {OverlayRef} from '../overlay-ref';
 import {isElementScrolledOutsideView, isElementClippedByScrolling} from './scroll-clip';
 import {coerceCssPixelValue} from '@angular/cdk/coercion';
+import {Platform} from '@angular/cdk/platform';
 
 
 // TODO: refactor clipping detection into a separate thing (part of scrolling module)
@@ -119,7 +120,9 @@ export class FlexibleConnectedPositionStrategy implements PositionStrategy {
   constructor(
     private _connectedTo: ElementRef,
     private _viewportRuler: ViewportRuler,
-    private _document: Document) {
+    private _document: Document,
+    // @deletion-target 7.0.0 `_platform` parameter to be made required.
+    private _platform?: Platform) {
     this._origin = this._connectedTo.nativeElement;
   }
 
@@ -155,8 +158,8 @@ export class FlexibleConnectedPositionStrategy implements PositionStrategy {
    * @docs-private
    */
   apply(): void {
-    // We shouldn't do anything if the strategy was disposed.
-    if (this._isDisposed) {
+    // We shouldn't do anything if the strategy was disposed or we're on the server.
+    if (this._isDisposed || (this._platform && !this._platform.isBrowser)) {
       return;
     }
 
@@ -285,7 +288,7 @@ export class FlexibleConnectedPositionStrategy implements PositionStrategy {
    * allows one to re-align the panel without changing the orientation of the panel.
    */
   reapplyLastPosition(): void {
-    if (!this._isDisposed) {
+    if (!this._isDisposed && (!this._platform || this._platform.isBrowser)) {
       this._originRect = this._origin.getBoundingClientRect();
       this._overlayRect = this._pane.getBoundingClientRect();
       this._viewportRect = this._getNarrowedViewportRect();

src/cdk/overlay/position/overlay-position-builder.ts

@@ -8,19 +8,22 @@
 
 import {ViewportRuler} from '@angular/cdk/scrolling';
 import {DOCUMENT} from '@angular/common';
-import {ElementRef, Inject, Injectable} from '@angular/core';
+import {ElementRef, Inject, Injectable, Optional} from '@angular/core';
 import {OriginConnectionPosition, OverlayConnectionPosition} from './connected-position';
 import {ConnectedPositionStrategy} from './connected-position-strategy';
 import {FlexibleConnectedPositionStrategy} from './flexible-connected-position-strategy';
 import {GlobalPositionStrategy} from './global-position-strategy';
+import {Platform} from '@angular/cdk/platform';
 
 
 /** Builder for overlay position strategy. */
 @Injectable({providedIn: 'root'})
 export class OverlayPositionBuilder {
   constructor(
     private _viewportRuler: ViewportRuler,
-    @Inject(DOCUMENT) private _document: any) { }
+    @Inject(DOCUMENT) private _document: any,
+    // @deletion-target 7.0.0 `_platform` parameter to be made required.
+    @Optional() private _platform?: Platform) { }
 
   /**
    * Creates a global position strategy.
@@ -51,7 +54,8 @@ export class OverlayPositionBuilder {
    * @param elementRef
    */
   flexibleConnectedTo(elementRef: ElementRef): FlexibleConnectedPositionStrategy {
-    return new FlexibleConnectedPositionStrategy(elementRef, this._viewportRuler, this._document);
+    return new FlexibleConnectedPositionStrategy(elementRef, this._viewportRuler, this._document,
+        this._platform);
   }
 
 }