Add ability to globally configure errorStateMatcher

- Also adds shortcut functionality to show the error when dirty (instead of touched)
- Also passes parent form group and parent form to errorStateMatcher

Author: willshowell

src/lib/core/core.ts

@@ -110,6 +110,13 @@ export {
   MD_PLACEHOLDER_GLOBAL_OPTIONS
 } from './placeholder/placeholder-options';
 
+// Error
+export {
+  ErrorStateMatcherType,
+  ErrorOptions,
+  MD_ERROR_GLOBAL_OPTIONS
+} from './error/error-options';
+
 @NgModule({
   imports: [
     MdLineModule,

src/lib/core/error/error-options.ts

@@ -0,0 +1,14 @@
+import {InjectionToken} from '@angular/core';
+import {NgControl, FormGroupDirective, NgForm} from '@angular/forms';
+
+/** Injection token that can be used to specify the global error options. */
+export const MD_ERROR_GLOBAL_OPTIONS =
+  new InjectionToken<() => boolean>('md-error-global-options');
+
+export type ErrorStateMatcherType =
+  (control: NgControl, parentFormGroup: FormGroupDirective, parentForm: NgForm) => boolean;
+
+export interface ErrorOptions {
+  errorStateMatcher?: ErrorStateMatcherType;
+  showOnDirty?: boolean;
+}

src/lib/input/input-container.spec.ts

@@ -24,6 +24,7 @@ import {
   getMdInputContainerPlaceholderConflictError
 } from './input-container-errors';
 import {MD_PLACEHOLDER_GLOBAL_OPTIONS} from '../core/placeholder/placeholder-options';
+import {MD_ERROR_GLOBAL_OPTIONS} from '../core/error/error-options';
 
 
 describe('MdInputContainer', function () {
@@ -738,6 +739,86 @@ describe('MdInputContainer', function () {
       });
     }));
 
+    it('should display an error message when global error matcher returns true', () => {
+
+      // Global error state matcher that will always cause errors to show
+      function globalErrorStateMatcher() {
+        return true;
+      }
+
+      TestBed.resetTestingModule();
+      TestBed.configureTestingModule({
+        imports: [
+          FormsModule,
+          MdInputModule,
+          NoopAnimationsModule,
+          ReactiveFormsModule,
+        ],
+        declarations: [
+          MdInputContainerWithFormErrorMessages
+        ],
+        providers: [
+          {
+            provide: MD_ERROR_GLOBAL_OPTIONS,
+            useValue: { errorStateMatcher: globalErrorStateMatcher } }
+        ]
+      });
+
+      let customFixture = TestBed.createComponent(MdInputContainerWithFormErrorMessages);
+      customFixture.detectChanges();
+
+      containerEl = customFixture.debugElement.query(By.css('md-input-container')).nativeElement;
+      testComponent = customFixture.componentInstance;
+
+      // Expect the control to still be untouched but the error to show due to the global setting
+      expect(testComponent.formControl.untouched).toBe(true, 'Expected untouched form control');
+      expect(containerEl.querySelectorAll('md-error').length).toBe(1, 'Expected an error message');
+    });
+
+    it('should display an error message when global setting shows errors on dirty', async() => {
+      TestBed.resetTestingModule();
+      TestBed.configureTestingModule({
+        imports: [
+          FormsModule,
+          MdInputModule,
+          NoopAnimationsModule,
+          ReactiveFormsModule,
+        ],
+        declarations: [
+          MdInputContainerWithFormErrorMessages
+        ],
+        providers: [
+          { provide: MD_ERROR_GLOBAL_OPTIONS, useValue: { showOnDirty: true } }
+        ]
+      });
+
+      let customFixture = TestBed.createComponent(MdInputContainerWithFormErrorMessages);
+      customFixture.detectChanges();
+
+      containerEl = customFixture.debugElement.query(By.css('md-input-container')).nativeElement;
+      testComponent = customFixture.componentInstance;
+
+      expect(testComponent.formControl.invalid).toBe(true, 'Expected form control to be invalid');
+      expect(containerEl.querySelectorAll('md-error').length).toBe(0, 'Expected no error messages');
+
+      testComponent.formControl.markAsTouched();
+      customFixture.detectChanges();
+
+      customFixture.whenStable().then(() => {
+        expect(containerEl.querySelectorAll('md-error').length)
+          .toBe(0, 'Expected no error messages when touched');
+
+        testComponent.formControl.markAsDirty();
+        customFixture.detectChanges();
+
+        customFixture.whenStable().then(() => {
+          expect(containerEl.querySelectorAll('md-error').length)
+            .toBe(1, 'Expected one error message when dirty');
+        });
+      });
+
+    });
+
     it('should hide the errors and show the hints once the input becomes valid', async(() => {
       testComponent.formControl.markAsTouched();
       fixture.detectChanges();
@@ -1069,7 +1150,7 @@ class MdInputContainerWithCustomErrorStateMatcher {
   formControl = new FormControl('', Validators.required);
   errorState = false;
 
-  customErrorStateMatcher(c: NgControl): boolean {
+  customErrorStateMatcher(): boolean {
     return this.errorState;
   }
 }

src/lib/input/input-container.ts

@@ -34,6 +34,11 @@ import {
   PlaceholderOptions,
   MD_PLACEHOLDER_GLOBAL_OPTIONS
 } from '../core/placeholder/placeholder-options';
+import {
+  ErrorStateMatcherType,
+  ErrorOptions,
+  MD_ERROR_GLOBAL_OPTIONS
+} from '../core/error/error-options';
 
 // Invalid input type. Using one of these will throw an MdInputContainerUnsupportedTypeError.
 const MD_INPUT_INVALID_TYPES = [
@@ -129,6 +134,7 @@ export class MdInputDirective {
   private _required = false;
   private _id: string;
   private _cachedUid: string;
+  private _errorOptions: ErrorOptions;
 
   /** Whether the element is focused or not. */
   focused = false;
@@ -182,7 +188,7 @@ export class MdInputDirective {
   }
 
   /** A function used to control when error messages are shown. */
-  @Input() errorStateMatcher: (control: NgControl) => boolean;
+  @Input() errorStateMatcher: ErrorStateMatcherType;
 
   /** The input element's value. */
   get value() { return this._elementRef.nativeElement.value; }
@@ -218,10 +224,14 @@ export class MdInputDirective {
               private _renderer: Renderer2,
               @Optional() @Self() public _ngControl: NgControl,
               @Optional() private _parentForm: NgForm,
-              @Optional() private _parentFormGroup: FormGroupDirective) {
+              @Optional() private _parentFormGroup: FormGroupDirective,
+              @Optional() @Inject(MD_ERROR_GLOBAL_OPTIONS) errorOptions: ErrorOptions) {
 
     // Force setter to be called in case id was not specified.
     this.id = this.id;
+
+    this._errorOptions = errorOptions ? errorOptions : {};
+    this.errorStateMatcher = this._errorOptions.errorStateMatcher || undefined;
   }
 
   /** Focuses the input element. */
@@ -245,17 +255,22 @@ export class MdInputDirective {
   _isErrorState(): boolean {
     const control = this._ngControl;
     return this.errorStateMatcher
-      ? this.errorStateMatcher(control)
+      ? this.errorStateMatcher(control, this._parentFormGroup, this._parentForm)
       : this._defaultErrorStateMatcher(control);
   }
 
   /** Default error state calculation */
   private _defaultErrorStateMatcher(control: NgControl): boolean {
     const isInvalid = control && control.invalid;
     const isTouched = control && control.touched;
+    const isDirty = control && control.dirty;
     const isSubmitted = (this._parentFormGroup && this._parentFormGroup.submitted) ||
         (this._parentForm && this._parentForm.submitted);
 
+    if (this._errorOptions.showOnDirty) {
+      return !!(isInvalid && (isDirty || isSubmitted));
+    }
+
     return !!(isInvalid && (isTouched || isSubmitted));
   }
 

src/lib/input/input.md

@@ -108,8 +108,7 @@ By default, error messages are shown when the control is invalid and the user ha
 (touched) the element or the parent form has been submitted. If you wish to customize this
 behavior (e.g. to show the error as soon as the invalid control is dirty), you can use the
 `errorStateMatcher` property of the `mdInput`. To use this property, create a function in
-your component class that accepts an `NgControl` and returns a boolean. A result of `true` will
-display the error messages.
+your component class that returns a boolean. A result of `true` will display the error messages.
 
 ```html
 <md-input-container>
@@ -119,7 +118,26 @@ display the error messages.
 ```
 
 ```ts
-function myErrorStateMatcher(control: NgControl): boolean {
+function myErrorStateMatcher(control: NgControl, parentFg: FormGroupDirective, parentForm: NgForm): boolean {
   return control.invalid && control.dirty;
 }
-```
+```
+
+A global error state matcher can be specified by setting the `MD_ERROR_GLOBAL_OPTIONS` provider. This applies
+to all inputs.
+
+```ts
+@NgModule({
+  providers: [
+    {provide: MD_ERROR_GLOBAL_OPTIONS, useValue: { errorStateMatcher: myErrorStateMatcher }}
+  ]
+})
+```
+
+Here are the available global options:
+
+
+| Name              | Type     | Description |
+| ----------------- | -------- | ----------- |
+| errorStateMatcher | Function | Returns a boolean specifying if the error should be shown |
+| showOnDirty       | boolean  | If true, the error will show when the control is dirty, not touched. |P