应用默认样式和 onClick 更改按钮的样式-Angular 4

我有一个按钮，我想应用按钮的默认样式，当用户单击按钮时，将按钮样式颜色更改为红色，将背景颜色更改为白色.Blow 是我的 .css 和组件.

.btn-default {白颜色;背景颜色:蓝色；}.btn 更改 {红色;背景颜色:白色；}

组件.ts

从'@angular/core'导入{组件}；@零件({选择器:'应用程序根'，templateUrl: './app.component.html',styleUrls: ['./app.component.css']})导出类 AppComponent {bntStyle:字符串；应用组件() {这.bntStyle = 'btn-default';}提交() {this.bntStyle = 'btn-change';}

.html

<button name="保存" [ngClass]="['bntStyle']" (onClick)="submit()">提交</button></div>

解决方案

你正在绑定字符串'btnStyle'.相反，您应该绑定归档:

<button name="保存" [ngClass]="[bntStyle]" (click)="submit()">提交</button></div>

I have one button, i want to apply a default style of a button and when user click on a button change a button style color to red and background-color to white. Blow is my .css and component.

.btn-default {
  color: white;
  background-color: blue;

}

.btn-change {
  color: Red;
  background-color: white;
}

Component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {

  bntStyle: string;
  AppComponent() {

   this. bntStyle = 'btn-default';
  }
  submit() {
    this.bntStyle = 'btn-change';

  }

.html

<div>
 <button name="Save" [ngClass]="['bntStyle']" (onClick)="submit()">Submit</button>
</div>

解决方案

You are binding the string 'btnStyle'. Instead, you should bind the filed:

<div>
    <button name="Save" [ngClass]="[bntStyle]" (click)="submit()">Submit</button>
</div>