Implement the tag selection function in WeChat mini program

To implement the tag selection function in WeChat mini programs, specific code examples are required

With the popularity of WeChat mini programs, more and more developers are beginning to pay attention to WeChat Mini program development technology. In the actual development of small programs, we often encounter situations where we need to select tags, such as product classification, hobbies, etc. This article will introduce in detail how to implement the tag selection function in WeChat applet and provide specific code examples.

In the WeChat applet, we can use the label component to display and select labels. The label component has the following important attributes:

1. data: used to store the data of the label, which can be an array, and each element in the array is a label.
2. selected: Used to store selected tags, which can be an array. Each element in the array represents a selected tag.
3. bindchange: used to bind the event of label selection change. This event will be triggered when the user selects or deselects a label.

The following is a simple label component sample code:

<view>
  <checkbox-group bindchange="handleTagChange">
    <block wx:for="{{data}}">
      <checkbox value="{{item}}" checked="{{isSelected(item)}}">{{item}}</checkbox>
    </block>
  </checkbox-group>
</view>

In this sample code, we use the checkbox-group component and checkbox component to display and select labels. The checkbox-group component is used to manage the selected state of the checkbox component. When the selected state of the checkbox changes, the event handleTagChange bound to the bindchange attribute will be triggered.

Next, we need to define the event processing function handleTagChange in the corresponding code logic to handle the logic of tag selection:

Page({
  data: {
    tagData: ["标签1", "标签2", "标签3", "标签4"],
    selectedTags: []
  },

  handleTagChange: function(e) {
    this.setData({
      selectedTags: e.detail.value
    });
  },

  isSelected: function(tag) {
    return this.data.selectedTags.indexOf(tag) !== -1;
  }
})

In this code, we use the Page object to define the page logic. The data attribute contains tag data tagData and selected tag data selectedTags.

In the handleTagChange function, we store the selected tag value in selectedTags, and then call the setData method to re-render the page.

The isSelected function is used to determine whether a tag is selected. It returns a Boolean value by determining the index position of the tag value in the selectedTags array.

Through the above implementation, we can implement the tag selection function in the WeChat applet. You can modify label data and styles according to your own needs to meet specific business needs.

Summary:
This article introduces how to use the label component of the WeChat applet to implement the label selection function. Through checkbox-group and checkbox components, we can easily display and select tags. Use the bindchange attribute to bind the selection change event, and use the event handler function to handle the logic of label selection. I hope this article can help you implement the tag selection function in WeChat applet development.

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