WeChat Mini Program Mall Project Shopping Quantity Addition and Subtraction

This article mainly introduces the function of adding and subtracting the shopping quantity in the WeChat mini program mall in detail. It has a certain reference value. Interested friends can refer to it

When we buy the baby, The quantity of shopping is often what we need to use, as shown below:
In the baby details page:

##In the shopping cart:

Now I will introduce this small component to you. How to write it in the small program

The picture below is the picture of this project:

wxml：

<!-- 主容器 --> 
<view class="stepper"> 
  <!-- 减号 --> 
  <text class="{{minusStatus}}" bindtap="bindMinus">-</text> 
  <!-- 数值 --> 
  <input type="number" bindchange="bindManual" value="{{num}}" /> 
  <!-- 加号 --> 
  <text class="normal" bindtap="bindPlus">+</text> 
</view>

wxss：

/*全局样式*/ 
page { 
  padding: 20px 0; 
} 
 
/*主容器*/ 
.stepper { 
  width: 80px; 
  height: 26px; 
  /*给主容器设一个边框*/ 
  border: 1px solid #ccc; 
  border-radius: 3px; 
  margin:0 auto; 
} 
 
/*加号和减号*/ 
.stepper text { 
  width: 19px; 
  line-height: 26px; 
  text-align: center; 
  float: left; 
} 
 
/*数值*/ 
.stepper input { 
  width: 40px; 
  height: 26px; 
  float: left; 
  margin: 0 auto; 
  text-align: center; 
  font-size: 12px; 
  /*给中间的input设置左右边框即可*/ 
  border-left: 1px solid #ccc; 
  border-right: 1px solid #ccc; 
} 
 
/*普通样式*/ 
.stepper .normal{ 
  color: black; 
} 
 
/*禁用样式*/ 
.stepper .disabled{ 
  color: #ccc; 
}

js：

Page({ 
  data: { 
    // input默认是1 
    num: 1, 
    // 使用data数据对象设置样式名 
    minusStatus: 'disabled' 
  }, 
  /* 点击减号 */ 
  bindMinus: function() { 
    var num = this.data.num; 
    // 如果大于1时，才可以减 
    if (num > 1) { 
      num --; 
    } 
    // 只有大于一件的时候，才能normal状态，否则disable状态 
    var minusStatus = num <= 1 ? &#39;disabled&#39; : &#39;normal&#39;; 
    // 将数值与状态写回 
    this.setData({ 
      num: num, 
      minusStatus: minusStatus 
    }); 
  }, 
  /* 点击加号 */ 
  bindPlus: function() { 
    var num = this.data.num; 
    // 不作过多考虑自增1 
    num ++; 
    // 只有大于一件的时候，才能normal状态，否则disable状态 
    var minusStatus = num < 1 ? &#39;disabled&#39; : &#39;normal&#39;; 
    // 将数值与状态写回 
    this.setData({ 
      num: num, 
      minusStatus: minusStatus 
    }); 
  }, 
  /* 输入框事件 */ 
  bindManual: function(e) { 
    var num = e.detail.value; 
    // 将数值与状态写回 
    this.setData({ 
      num: num 
    }); 
  } 
})

Run result:

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