Implement the drop-down menu effect in WeChat applet

To implement the drop-down menu effect in WeChat mini programs, specific code examples are required

With the popularity of mobile Internet, WeChat mini programs have become an important part of Internet development , more and more people are beginning to pay attention to and use WeChat mini programs. The development of WeChat mini programs is simpler and faster than traditional APP development, but it also requires mastering certain development skills.

In the development of WeChat mini programs, drop-down menus are a common UI component, achieving a better user operating experience. This article will introduce in detail how to implement the drop-down menu effect in the WeChat applet and provide specific code examples.

First, we need to define the basic structure of a drop-down menu in the wxml file, as shown below:

<view class="dropdown">
  <view class="dropdown-header" bindtap="toggleDropdown">{{selectedItem}}</view>
  <view class="dropdown-list" hidden="{{!isDropdownOpen}}">
    <view class="dropdown-item" wx:for="{{dropdownItems}}" wx:key="index" bindtap="selectItem">{{item}}</view>
  </view>
</view>

In the above code, we wrap the entire drop-down menu through a view container. By setting the click event bindtap="toggleDropdown" you can control the hiding and display of the drop-down menu. In the dropdown-header view, we can display the currently selected menu item. The dropdown-list view is used to display all drop-down menu items.

Next, define the corresponding styles in the wxss file so that the drop-down menu has a good appearance and interactive effect:

.dropdown {
  position: relative;
  width: 200rpx;
}

.dropdown-header {
  padding: 10rpx 0;
  border-bottom: 1rpx solid #f0f0f0;
}

.dropdown-list {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #fff;
  box-shadow: 0 2rpx 4rpx rgba(0, 0, 0, .2);
  min-width: 100%;
  z-index: 999;
}

.dropdown-item {
  padding: 10rpx;
  border-bottom: 1rpx solid #f0f0f0;
}

In the above code, we set the corresponding styles for each part of the drop-down menu The style, position: relative can position the entire drop-down menu relative to the parent element. position: absoluteYou can absolutely position the list part of the drop-down menu.

Finally, in the js file, we need to handle the hiding and showing of the drop-down menu and the selection of options.

Page({
  data: {
    isDropdownOpen: false, // 判断下拉菜单是否打开的标志
    selectedItem: "请选择", // 当前选中的菜单项
    dropdownItems: ["选项1", "选项2", "选项3"] // 下拉菜单的选项列表
  },
  toggleDropdown: function() {
    this.setData({
      isDropdownOpen: !this.data.isDropdownOpen
    });
  },
  selectItem: function(e) {
    this.setData({
      selectedItem: e.target.dataset.item,
      isDropdownOpen: false
    });
  }
})

In the above code, we bind data through the data attribute, isDropdownOpen indicates whether the drop-down menu is open, and selectedItem indicates The currently selected menu item. The display and hiding of the drop-down menu can be switched through the toggleDropdown method, and the selectItem method is used to handle the selection operation of the option.

Through the above code examples, we can implement a simple drop-down menu effect in the WeChat applet. Depending on the needs, we can further modify and optimize the code to achieve more diverse drop-down menu effects.

Summary:
This article introduces how to implement the drop-down menu effect in the WeChat applet and provides corresponding code examples. I hope it will be helpful to everyone in the development of small programs. By understanding and mastering relevant development skills, you can achieve richer and more diverse user interaction effects and improve the user experience of mini programs.

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