How to use uniapp to intercept deletion events

With the rapid development of mobile applications, more and more developers choose to use uniapp to develop cross-platform applications. However, we may encounter a problem during the development process: How to prevent users from accidentally deleting valuable data during misoperation? In this article, we will learn how to use uniapp to intercept deletion events to avoid this situation. occur.

1. Introduction to uniapp delete event

In uniapp, the delete event (delete) can be used to trigger a specific operation when the user presses the delete button. Delete events are common in text editors and file managers and allow the user to select one or more objects and delete them from the data source or disk. However, in some applications, the data can be so important that once deleted it cannot be recovered. In this case, it is important from the user's perspective to capture and prevent misoperations.

2. Methods to prevent accidental deletion

1. Prevent accidental deletion

To prevent excessive deletion, you can use the following three steps:

• Use notification pop-ups: When the user presses the delete button, a large number of notification pop-ups will pop up on the screen to remind the user that the operation may result in permanent deletion of data. To a certain extent, it can make users think carefully before performing deletion operations.
• Add confirmation pop-up window: Similar to the notification pop-up window, the confirmation pop-up window will appear when the user clicks the delete button. It requires the user to click OK to complete the deletion. Using this method, the user needs to click twice, reducing the possibility of misoperation.
• Prohibit deletion: If the data is particularly important or sensitive, users can be completely prohibited from deleting it. This method is less susceptible to misuse, but may have limitations when passing data.

2. Interception of deletion events and other events

In uniapp, we can use $mixin to extend the functionality of the component and add interceptors to it . Interceptors capture events and perform logical operations, such as displaying a prompt box when a component is deleted.

Assuming that we want to prevent unnecessary data from being accidentally deleted in the database, we need to do the following:

• Create a hybrid project, such as deleteHandlers.
• Get the required data through the uni.getStorageSync method, and then add an interceptor for the deletion event. In the event interceptor, when the user presses the delete button, check whether the data belongs to the database, and if it is not data in the database, a prompt box will pop up asking the user to confirm the deletion.

export default {
  methods: {
    handleDelete(item) {
      if (this.isItemInDatabase(item)) {
        uni.showModal({
          title: "确认删除数据",
          content: "您确定要删除此项吗？",
          success: function (res) {
            if (res.confirm) {
              // 用户确认删除
              uni.showToast({
                title: "删除成功",
                duration: 2000,
                icon: "none",
              });
              this.deleteItem(item);
            } else {
              // 用户取消删除
              uni.showToast({
                title: "已取消删除",
                duration: 2000,
                icon: "none",
              });
            }
          }.bind(this),
        });
      } else {
        // 非数据库数据，不处理删除事件
        uni.showToast({
          title: "不可删除",
          duration: 2000,
          icon: "none",
        });
      }
    }
  }
}

• To use interceptors, you can mix them into components. The interceptor will be automatically used in the handleDelete method during operation.

import deleteHandlers from "@/mixins/deleteHandlers";

export default {
  mixins: [deleteHandlers],
}

3. Summary

In this article, we introduce how to use uniapp to intercept deletion events to prevent users from accidentally deleting valuable data during misoperation. We can achieve this by adding confirmation and notification pop-ups to the deletion event, prohibiting deletion and intercepting the event. Help users plan and minimize risks and contribute to data security by preventing excessive deletions.

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