feat(admin-ui): Allow custom error messages passed to FormFieldComponent

admin-ui/src/app/shared/components/form-field/form-field-control.directive.ts

@@ -1,15 +1,14 @@
 import { Directive, ElementRef, Optional } from '@angular/core';
-import { FormControl, NgControl } from '@angular/forms';
+import { NgControl } from '@angular/forms';
 
 type InputElement = HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement;
 
 // tslint:disable:directive-selector
 @Directive({ selector: 'input, textarea, select' })
 export class FormFieldControlDirective {
-    formControl: FormControl;
     constructor(
         private elementRef: ElementRef<InputElement>,
-        @Optional() private formControlName: NgControl,
+        @Optional() public formControlName: NgControl,
     ) {}
 
     get valid(): boolean {

admin-ui/src/app/shared/components/form-field/form-field.component.html

@@ -1,4 +1,8 @@
-<div class="form-group" [class.no-label]="!label">
+<div
+    class="form-group"
+    [class.no-label]="!label"
+    [class.clr-error]="formFieldControl.formControlName.invalid"
+>
     <label *ngIf="label" [for]="for" class="clr-control-label">
         {{ label }}
         <clr-tooltip *ngIf="tooltip">
@@ -28,6 +32,7 @@
                 <clr-icon shape="edit"></clr-icon>
             </button>
         </div>
+        <div class="clr-subtext" *ngIf="getErrorMessage()">{{ getErrorMessage() }}</div>
         <span class="tooltip-content">{{ label }} is required.</span>
     </label>
 </div>

admin-ui/src/app/shared/components/form-field/form-field.component.ts

@@ -22,6 +22,11 @@ export class FormFieldComponent implements OnInit {
     @Input() label: string;
     @Input() for: string;
     @Input() tooltip: string;
+    /**
+     * A map of error message codes (required, pattern etc.) to messages to display
+     * when those errors are present.
+     */
+    @Input() errors: { [key: string]: string } = {};
     /**
      * If set to true, the input will be initially set to "readOnly", and an "edit" button
      * will be displayed which allows the field to be edited.
@@ -42,4 +47,18 @@ export class FormFieldComponent implements OnInit {
         this.formFieldControl.setReadOnly(value);
         this.isReadOnly = value;
     }
+
+    getErrorMessage(): string | undefined {
+        if (!this.formFieldControl || !this.formFieldControl.formControlName) {
+            return;
+        }
+        const errors = this.formFieldControl.formControlName.errors;
+        if (errors) {
+            for (const errorKey of Object.keys(errors)) {
+                if (this.errors[errorKey]) {
+                    return this.errors[errorKey];
+                }
+            }
+        }
+    }
 }