微信小程序：带输入栏的选择项蒙版弹窗

有一段时间没弄小程序了，现在新增一需求，需要在点击取消按钮时选择取消原因。于是，又开始折腾...

蒙版实现

看到这个需求，第一想法是点击后弹出一个蒙版弹窗，里面带有选择项按钮。于是，在之前的页面上，增加一个半透的view，在这个view中添加想要的各种控件。文章源自IT老刘-https://wp.itlao6.com/856.html

于是,在wxml中加入：文章源自IT老刘-https://wp.itlao6.com/856.html

<view class='maskWindow'  />

css为：文章源自IT老刘-https://wp.itlao6.com/856.html

.maskWindow{
  height: 100%;
  width: 100%;
  position: fixed;
  background-color:rgba(0, 0, 0, .2);
  z-index: 2;
  top: 0;
  left: 0;
}

底部窗体

我们想让内容显示在最底部，于是改为：文章源自IT老刘-https://wp.itlao6.com/856.html

<view class='maskWindow'>
  <view class='maskWindowContent'>
    <text>itlao5.com</text>
  </view>
</view>

css增加：文章源自IT老刘-https://wp.itlao6.com/856.html

.maskWindowContent {
  padding: 20rpx 0;
  width: 100%;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  position: fixed;
  bottom:0;
}

最终效果

我们还需要增加一些其他功能，如点击蒙版区域自动消息、移除蒙版下方原页面的滑动事件、只有点击某按钮才显示蒙版弹窗、取消原因分两列显示，点击其他原因可手动输入等...文章源自IT老刘-https://wp.itlao6.com/856.html

<view class='maskWindow' wx:if="{{isMaskWindowShow}}" catchtap='maskWindowBgClick' catchtouchmove='move'>
  <view class='maskWindowContent' catchtap='clickTap'>
    <text class="maskWindowTitleText" >取消原因（可选）</text>
    <view class='maskWindowList' wx:for='{{maskWindowList}}' wx:for-index='index' wx:if='{{index%2===0}}'>
        <view class="maskWindowText {{index == selectIndex? 'maskWindowText_selected' : 'maskWindowText_unselected'}}" catchtap='maskWindowTableSelect' data-window-Index='{{index}}'>{{maskWindowList[index]}}</view>
        <view class="maskWindowText {{index + 1 == selectIndex? 'maskWindowText_selected' : 'maskWindowText_unselected'}}" catchtap='maskWindowTableSelect' data-window-Index='{{index+1}}'>{{maskWindowList[index+1]}}</view>
    </view>
    <view class='maskWindowInputView'>
      <input class='maskWindowInput' maxlength='100' placeholder='请输入其他原因' hidden='{{!isMaskWindowInputShow}}' bindinput='maskWindowInput'></input>
    </view>
    <view class='maskWindowBtnView'>
      <view class='maskWindowBtn' catchtap='maskWindowOk'>确定</view>
      <view class='maskWindowBtn' catchtap='maskWindowCancel'>取消</view>
    </view>
  </view>
</view>

css为：文章源自IT老刘-https://wp.itlao6.com/856.html

  .maskWindow{
    height: 100 %;
    width: 100 %;
    position: fixed;
    background - color: rgba(0, 0, 0, .2);
    z - index: 2;
    top: 0;
    left: 0;
  }
  .maskWindowContent {
    padding: 20rpx 0;
    width: 100 %;
    background: #ffffff;
    display: flex;
    flex - direction: column;
    justify - content: space - around;
    align - items: center;
    position: fixed;
    bottom: 0;
  }
  .maskWindowTitleText {
    padding: 10rpx 20rpx;
    margin: 10rpx;
    font - size: 16px;
    width: 80 %;
  }
  .maskWindowList {
    width: 80 %;
    display: flex;
    flex - direction: row;
  }
  .maskWindowText {
    padding: 10rpx 20rpx;
    margin: 8rpx;
    width: 50 %;
    font - size: 14px;
    border - radius: 10rpx;
  }
  .maskWindowText_selected {
    border: 1px solid #15c261;
  }
  .maskWindowText_unselected {
    border: 1px solid lightgray;
  }
  .maskWindowInputView {
    width: 80 %;
  }
  .maskWindowInput {
    margin: 15rpx 0;
    padding: 10rpx 20rpx;
    font - size: 14px;
    border: 1px solid lightgray;
    border - radius: 10rpx;
  }
  .maskWindowBtnView {
    width: 80 %;
    margin - top: 20rpx;
    display: flex;
    flex - direction: row;
    justify - content: flex - end;
  }
  .maskWindowBtn {
    padding: 10rpx 50rpx;
    margin: 20rpx;
    font - size: 14px;
    border - radius: 10rpx;
    border: 1px solid #15c261;
  }

当然还需要js进行控制：

/**
 * 页面的初始数据
 */
data: {
  isMaskWindowShow: false,
  maskWindowList: ['时间太早', '时间太晚', '距离太远', '交通不方便', '其他（输入）', '没有原因'],
  selectIndex: -1,
  isMaskWindowInputShow: false,
  maskWindowInputValue: ""
},
//弹框以外区域点击
maskWindowBgClick: function (e) {
  this.dismissMaskWindow();
},

//弹窗区域点击事件
clickTap: function (e) {

},

//切换选择项事件
maskWindowTableSelect: function (e) {
  var index = e.currentTarget.dataset.windowIndex;
  this.setData({
    selectIndex: e.currentTarget.dataset.windowIndex,
    isMaskWindowInputShow: index == 4
  })
},

//输入框输入绑定事件
maskWindowInput: function (e) {
  var value = e.detail.value;
  this.setData({
    maskWindowInputValue: value
  })
},

maskWindowOk: function (e) {
  var index = this.data.selectIndex;
  var text;
  if (index >= 0 && index < 4) {
    text= this.data.maskWindowList[index];
  } else if (index == 4) {
    text = this.data.maskWindowInputValue;
  } else {
    text = "";
  }
  this.cancel(text); // 真正的取消操作
  this.dismissMaskWindow();
},

maskWindowCancel: function (e) {
  this.dismissMaskWindow();
},

// 显示蒙版弹窗
showMaskWindow: function () {
  this.setData({
    isMaskWindowShow: true,
    selectIndex: -1,
    isMaskWindowInputShow: false,
    maskWindowInputValue: ""
  })
},

// 隐藏蒙版窗体
dismissMaskWindow: function () {
  this.setData({
    isMaskWindowShow: false,
    selectIndex: -1,
    isMaskWindowInputShow: false,
    maskWindowInputValue: ""
  })
} 

在使用，通过点击原页面“取消”按钮，调用this.showMaskWindow()即可显示该蒙版弹窗。文章源自IT老刘-https://wp.itlao6.com/856.html

简书：ThinkinLiu 博客: IT老五文章源自IT老刘-https://wp.itlao6.com/856.html

这些差不多算是全部代码了，当然如果想看完整的，点下面链接进入：
Github源码： https://github.com/ThinkinLiu/MaskWindow文章源自IT老刘-https://wp.itlao6.com/856.html 文章源自IT老刘-https://wp.itlao6.com/856.html