WeChat applet implements list item expansion and folding function

The WeChat applet implements the expand and fold function of list items and requires specific code examples

Introduction:
The WeChat applet is a rapidly developed, cross-platform application Program, which provides a rich API and components to easily develop and publish small programs to meet the different needs of users. When developing small programs, we often encounter scenarios where lists need to be displayed, and sometimes the list is too long, resulting in complicated page display. In order to improve the user experience and the aesthetics of the interface, we can consider using the list item expand and collapse function. This article will introduce how to implement the expand and collapse function of list items in WeChat applet and provide specific code examples.

1. Implementation ideas:
First, we need to define a list in the wxml file and set a variable to control the expanded and collapsed state of the list items. Then, by binding the click event, modify the value of the variable to achieve the effect of expanding and folding. Finally, the detailed information is displayed or hidden by dynamically modifying the style of the view according to the expanded and collapsed state of the list item.

2. Code example:

1. Define the list in the wxml file and set the variables to control the expansion and folding state:

<view class="list">
  <view class="item" wx:for="{{list}}" wx:key="{{index}}">
    <view class="title" bind:tap="toggleItem">{{item.title}}</view>
    <view class="content" wx:if="{{item.isExpanded}}">
      <!-- 详细信息内容 -->
      <text class="info">{{item.info}}</text>
    </view>
  </view>
</view>

2. In js Implement the event processing function in the file:

Page({
  data: {
    list: [
      {title: "列表项1", info: "列表项1的详细信息", isExpanded: false},
      {title: "列表项2", info: "列表项2的详细信息", isExpanded: false},
      {title: "列表项3", info: "列表项3的详细信息", isExpanded: false},
      ...
    ],
  },
  
  toggleItem: function(event) {
    var index = event.currentTarget.dataset.index;
    var list = this.data.list;
    list[index].isExpanded = !list[index].isExpanded;
    this.setData({
      list: list
    });
  }
})

3. Define the style in the wxss file:

.list {
  margin-top: 20rpx;
}

.item {
  padding: 10rpx;
  border-bottom: 1rpx solid #999;
}

.title {
  font-size: 28rpx;
  color: #333;
}

.content {
  margin-top: 10rpx;
  font-size: 26rpx;
  color: #666;
}

.info {
  margin-top: 10rpx;
}

3. Code description:

1. In the wxml file, use wx:for to loop the list and bind the click event bind:tap="toggleItem", and call the toggleItem function to achieve the expand and collapse effect. Use wx:if conditional judgment to decide whether to display the detailed information based on the isExpanded attribute of the list item.
2. In the js file, an event handling function named toggleItem is defined. This function obtains the index of the currently clicked list item through event.currentTarget.dataset.index, and then modifies the value of the isExpanded attribute of the list item based on the index to achieve the effect of expansion and collapse. Finally, use the setData method to update the page's data.
3. In the wxss file, the style of the list items is defined, including the style of the title, content and details.

Summary:
Through the above code examples, we can achieve the effect of expanding and folding functions in WeChat mini programs. During the development process, the style can be adjusted according to actual needs and appropriately modified according to the specific data structure. I hope this article can help you implement the expand and collapse function of list items in WeChat applet. If you have any questions, please leave a message to discuss.

The above is the detailed content of WeChat applet implements list item expansion and folding function. For more information, please follow other related articles on the PHP Chinese website!