Use WeChat applet to implement table sorting function

Use WeChat mini programs to implement table sorting functions

With the popularity of WeChat mini programs, more and more developers are beginning to explore how to use WeChat mini programs to achieve more What interesting and practical features. Among them, implementing the table sorting function is a topic of interest to many developers. This article will introduce how to use WeChat applet to implement table sorting function, and provide specific code examples.

1. Requirements Analysis
Before starting to write code, we first need to clarify the functional requirements to be implemented. Specifically, we hope to implement a table in the WeChat applet. The table has multiple columns. Users can click on a column in the header to sort the table data in ascending or descending order. This function seems relatively simple, but it involves some details, such as how to store and process table data, how to implement click events on table columns, etc.

2. Implementation Ideas
Based on the above demand analysis, we can adopt the following implementation ideas:

1. Define an array to store table data, each array element corresponds to one row of the table data;
2. Render the table on the page and bind the table data to the data variables of the page;
3. Add a click event to the header column in the table and trigger a function when clicked ;
4. In the click event function, sort the table data according to the clicked column and update the data variables of the page;
5. After the data variables of the page change, the page will automatically re-render sheet.

3. Code Implementation
Next, let’s implement the above functional ideas in detail. The following is a simple sample code:

1. In the wxml file, define a table and bind the data variables:

<!--wxml文件-->
<view class="table">
  <view class="table-header">
    <view class="table-cell" bindtap="sortById">ID</view>
    <view class="table-cell" bindtap="sortByTitle">Title</view>
    <view class="table-cell" bindtap="sortByDate">Date</view>
  </view>
  <view class="table-body">
    <block wx:for="{{tableData}}">
      <view class="table-row">
        <view class="table-cell">{{item.id}}</view>
        <view class="table-cell">{{item.title}}</view>
        <view class="table-cell">{{item.date}}</view>
      </view>
    </block>
  </view>
</view>

2. In the corresponding js file , write the click event function:

//js文件
Page({
  data: {
    tableData: [
      {id: 1, title: 'Title 1', date: '2021-01-01'},
      {id: 2, title: 'Title 2', date: '2021-02-01'},
      {id: 3, title: 'Title 3', date: '2021-03-01'},
    ]
  },
  
  // 按 ID 排序
  sortById: function() {
    let tableData = this.data.tableData;
    tableData.sort((a, b) => a.id - b.id);
    this.setData({
      tableData: tableData
    });
  },
  
  // 按 Title 排序
  sortByTitle: function() {
    let tableData = this.data.tableData;
    tableData.sort((a, b) => a.title.localeCompare(b.title));
    this.setData({
      tableData: tableData
    });
  },
  
  // 按 Date 排序
  sortByDate: function() {
    let tableData = this.data.tableData;
    tableData.sort((a, b) => new Date(a.date) - new Date(b.date));
    this.setData({
      tableData: tableData
    });
  },
})

In the above code, we defined a tableData array to store the table data, and then implemented the functions sorted by ID, Title, and Date, and in each In the function, tableData is sorted and the data is updated.

4. Summary
Through the above code examples, we have successfully realized the need to use the table sorting function in the WeChat applet. When the user clicks on a column of the table, the table data will be displayed sorted according to the clicked column. This function can be applied in many scenarios, such as order lists, rankings, etc.

In actual development, we can also perform more optimizations according to needs, such as adding sorting arrow icons, supporting multi-column sorting, etc. I hope this article can help developers who are developing WeChat mini programs and provide some ideas and sample code.

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