角度：星级

Question

我想实施评级星系统。单击后返回正确的星值。我在正确显示所选星星时遇到问题。就像在这张照片中一样，它没有向我显示黄色的 3 颗星。如何改变它？ 组件：

 export class RatingStarComponent implements OnInit {
  stars: number[] = [1, 2, 3, 4, 5];
  constructor() { }
  ngOnInit() {
  }
  countStar(star) {
    console.log('Value of star', star);
  }
}

HTML：

 <div class="row">
  <div class="col-sm-12">
      <ul class="list-inline rating-list" *ngFor="let star of stars" style="display: inline-block" >
          <li (click)="countStar(star)"><i   class="fa fa-star "></i></li> 
      </ul>
  </div>
</div>

CSS：

  .rating-list li {
  float: right;
  color: #ddd;
  padding: 10px 5px;

}

.rating-list li:hover,
.rating-list li:hover ~ li {
  color: #ffd700;
}

.rating-list {
  display: inline-block;
  list-style: none;
}

欢迎任何帮助或建议。

Answer 1

我尝试使用材质图标。它正在工作。

HTML：

<ul class="list-inline rating-list" *ngFor="let star of stars; let i= index">
    <li (click)="countStar(star)" [ngClass]="{'selected': (star <= selectedValue)}" (mouseover)="addClass(star)"
         (mouseout)="removeClass()"> <span class="material-icons">star</span>
    </li>
</ul>

ts

stars: number[] = [1, 2, 3, 4, 5];
selectedValue: number = 0;
isMouseover = true;

countStar(star: number) {
  this.isMouseover = false;
  this.selectedValue = star;
}

 addClass(star: number) {
  if (this.isMouseover) {
    this.selectedValue = star;
  }
 }

 removeClass() {
   if (this.isMouseover) {
      this.selectedValue = 0;
   }
 }

CSS

.rating-list {
  display: inline-block;
  list-style: none;
}
.rating-list li {
  font-size: 20px;
  float: right;
  color: #ddd;
  padding: 10px 5px;
}
.rating-list li:hover {
  color: #ffd700;
}
.rating-list li:hover ~ li {
  color: #ffd700;
}
.rating-list li.selected {
  color: #ffd700;
}

Answer 2

改进版

在这个解决方案中，即使在悬停时，所有以前的星星的颜色都会变成黄色：

HTML：

<div class="row">
  <div class="col-sm-12">
      <ul class="list-inline rating-list" *ngFor="let star of stars; let i= index" style="display: inline-block"> 
          <li (click)="countStar(star)" id="{{'starId'+i}}" [ngClass]="{'selected': (star <= selectedValue)}" 
           (mouseover)="addClass(star)" (mouseout)="removeClass(star)"> ★
          </li>
      </ul>
  </div>
</div>

Component.ts：

stars: number[] = [1, 2, 3, 4, 5];
selectedValue: number = 0;

countStar(star) {
    this.selectedValue = star;
  }

addClass(star) {
   let ab = "";
   for (let i = 0; i < star; i++) {
     ab = "starId" + i;
     document.getElementById(ab).classList.add("selected");
   }
}
removeClass(star) {
   let ab = "";
   for (let i = star-1; i >= this.selectedValue; i--) {
     ab = "starId" + i;
     document.getElementById(ab).classList.remove("selected");
   }
}

SCSS：

.rating-list {
    li {
    font-size: 20px;
        float: right;
        color: #ddd;
        padding: 10px 5px;
        &:hover {
            color: #ffd700;
            ~ {
                li {
                    color: #ffd700;
                }
            }
        }
    }
    li.selected {
        color: #ffd700;
    }
    display: inline-block;
    list-style: none;
}

详情请见this example。

Answer 3

你必须存储选择的值：

countStar(star) {
    this.selectedValue = star;
    console.log('Value of star', star);
}

并添加类，该类将更改所有评级小于或等于评级的星星的颜色：

.rating-list li.selected {
    color: #ffd700;
}

<li (click)="countStar(star)"
    [ngClass]="{'selected': (star <= selectedValue)}">
        <i class="fa fa-star"></i>
</li> 

详情请见full example。