prefix element type with underscore

Author: Ales Rechtorik

src/lib/input/input.html

@@ -4,7 +4,7 @@
 
     <div class="md-input-infix">
       <input #input
-             *ngIf="elementType === 'input'"
+             *ngIf="_elementType === 'input'"
              class="md-input-element"
              [class.md-end]="align == 'end'"
              [attr.aria-label]="ariaLabel"
@@ -37,7 +37,7 @@
 
       <textarea
              #input
-             *ngIf="elementType === 'textarea'"
+             *ngIf="_elementType === 'textarea'"
              class="md-input-element  md-input-element-textarea"
              [class.md-end]="align == 'end'"
              [attr.aria-label]="ariaLabel"

src/lib/input/input.ts

@@ -234,11 +234,11 @@ export class MdInput implements ControlValueAccessor, AfterContentInit, OnChange
 
   @ViewChild('input') _inputElement: ElementRef;
 
-  elementType: 'input' | 'textarea';
+  _elementType: 'input' | 'textarea';
 
   constructor(public _elementRef: ElementRef) {
     // Set the element type depending on normalized selector used(md-input / md-textarea)
-    this.elementType = this._elementRef.nativeElement.nodeName.toLowerCase() === 'md-input' ?
+    this._elementType = this._elementRef.nativeElement.nodeName.toLowerCase() === 'md-input' ?
         'input' :
         'textarea';
   }