How to implement multi-level folding list in uniapp

With the popularity of mobile applications, the way users display the interface is gradually diversified. It is no longer just a simple single-layer list, but a multi-level folded list. In the development of mobile applications, uniapp, as a cross-platform development framework, helps developers simplify the development process and improve development efficiency. In this article, we will explore how uniapp implements the functionality of multi-level collapsible lists.

1. Basic introduction to uniapp

Uniapp is a cross-platform application framework based on the vue.js framework, which can achieve one-time development and multi-platform release, including Android, iOS, H5, etc. a platform. uniapp is compatible with the syntax of mini programs and vue.js, is easy to use, and provides a complete development ecosystem to facilitate developers to quickly build cross-platform applications.

2. Requirements analysis of multi-level folding list

Multi-level folding list, as the name suggests, means that the list has multiple levels, and each level can be folded or expanded. Let’s briefly analyze the requirements for multi-level folding lists:

1. Supports multi-level nesting, and each level can be nested within each other

2. Supports the expansion and folding of lists , when the user clicks on an item, the item can be hidden or expanded to the next level

3. Supports dynamic loading and lazy loading of list data, which can improve the application experience when the amount of data is large

3. Implementation steps of multi-level folding list

The process of implementing multi-level folding list requires the use of template syntax in vue.js and components provided by uniapp. Here we will implement this The basic functions of a list and show the implementation steps.

1. Create a basic multi-level folding list

First, create a basic multi-level folding list component in the uniapp project, including displaying basic structures such as hierarchical nodes and sub-nodes. During the creation process, you need to pay attention to the JS logic part so that clicking on a node can fold or expand it. At the same time, you need to be responsible for data storage, modification, loading and other matters.

2. Add the data acquisition interface

After that, add the data acquisition interface so that the list can dynamically load data. You can use the ajax request data interface in the life cycle function of uniapp to save or process the data.

3. Implement lazy loading of list data

When the amount of data is large and needs to be loaded dynamically, lazy loading technology can be used. When the list scrolls to the bottom, a request is sent to obtain the data on the next page to implement lazy loading of data.

4. Implement multi-level loading and display

When the list is multi-level, the child nodes of the next level of each node need to be dynamically displayed. Use v-click events to control the expansion and collapse of nodes, and bind the corresponding child node information at the same time.

4. Performance optimization of multi-level folding lists

In the process of implementing multi-level folding lists, some performance problems will be encountered. For example, when the amount of data is large, the speed of generating DOM nodes is slow, affecting the user experience; when multi-level loading occurs, problems such as lags may occur during the data request process. To address these problems, we can adopt some optimization strategies, such as:

1. Use caching technology to cache the displayed nodes and reduce the number of DOM operations

2. Use virtual scrolling technology , only the visible part is displayed, reducing the number of generated DOM nodes

3. For large amounts of data, perform data paging, request the next page of data when scrolling to the bottom, and reduce the need to load data at one time Time and memory usage

5. Summary

In this article, we analyzed the needs of uniapp to implement multi-level folding lists and showed the implementation steps. Of course, during the implementation process, details need to be adjusted and optimized, such as incremental data updates, sliding animation effects and other details. In short, through the introduction of this article, readers can basically master the skills of uniapp to implement multi-level folding lists.

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