Vue and Element-UI cascaded drop-down box search function

Conclusion: When implementing the Vue and Element-UI cascaded drop-down box search function, the filterable attribute provided by Element-UI is poor. Instead, developers should write search functions themselves to improve efficiency. Core idea: Use independent search functions to filter data instead of relying on Element-UI's default filtering. Customize the data display, instead of using the filterable property. Advanced usage: Anti-shake treatment to avoid frequent searches. Use virtual list technology to optimize performance under extremely large data volumes. Common errors and debugging techniques: unstandard data structure and error in search logic. Debugging method: Print the data structure and debug the search function step by step. **

Vue and Element-UI cascaded drop-down box search function: deep analysis and performance optimization

Many students will encounter the need to search for functions when using Vue and Element-UI to do projects. This seems simple, but there are many pitfalls in actual implementation. In this article, we will explore in-depth how to implement this function gracefully and avoid some common pitfalls. After reading it, you can not only easily handle this function, but also improve your understanding of Vue and Element-UI, as well as your understanding of front-end performance optimization.

Let’s talk about the conclusion first: Although it is convenient to directly use the filterable attribute provided by Element-UI, its performance is worrying, especially when the data volume is large. So, we have to do it ourselves and have enough food and clothing.

Basic review: Vue and Element-UI

I believe that all viewers are already familiar with Vue and Element-UI. Simply put, Vue is a progressive JavaScript framework. Element-UI is a Vue-based UI component library that provides rich components, including a cascade selector (Cascader). filterable attribute allows users to enter keywords in the cascading selector to search, but its implementation is relatively rough, full matching, and inefficient.

Core function analysis: efficient cascading search

Our goal is to achieve an efficient cascading search function. The core idea is: use an independent search function to filter the data, rather than relying on the default filtering mechanism of Element-UI.

Here, we do not use filterable attribute, but control the display of data by ourselves. The code is as follows:

 <code class="javascript"><template> <el-cascader v-model="value" :options="filteredOptions" :props="props" placeholder="请选择"></el-cascader> <el-input v-model="searchKeyword" placeholder="搜索"></el-input> </template> <script> import { ref, computed } from &#39;vue&#39;; export default { setup() { const options = [ // 你的级联数据{ value: &#39;1&#39;, label: &#39;选项1&#39;, children: [ { value: &#39;1-1&#39;, label: &#39;选项1-1&#39; }, { value: &#39;1-2&#39;, label: &#39;选项1-2&#39; } ] }, // ...更多数据]; const props = { value: &#39;value&#39;, label: &#39;label&#39;, children: &#39;children&#39; }; const value = ref([]); const searchKeyword = ref(&#39;&#39;); const filteredOptions = computed(() => { if (!searchKeyword.value) return options; return filterOptions(options, searchKeyword.value); }); const filterOptions = (options, keyword) => { return options.map(item => ({ ...item, children: item.children ? filterOptions(item.children, keyword) : undefined })).filter(item => item.label.includes(keyword) || (item.children && item.children.length > 0)); }; const handleChange = (value) => { console.log(value); }; const handleSearch = () => { // 可以在这里添加防抖处理，避免频繁搜索}; return { options, props, value, searchKeyword, filteredOptions, handleChange, handleSearch }; } }; </script></code>

The key to this code is the filterOptions function. It recursively traverses the option data and filters the data according to keyword . Note that here we only filter the label field, you can modify it according to the actual situation.

Advanced usage: Performance optimization and anti-shake

Although the above code is much more efficient than using filterable directly, performance may still be a problem for super large amount of data. Solution:

• Anti-shake: Use anti-shake function to avoid frequent triggering of searches when users enter frequently. lodash's debounce function is a good choice.
• Virtual list: If the amount of data is too large, you can consider using virtual list technology to render only data in visible areas.

Common Errors and Debugging Tips

Frequently asked questions: The data structure is not standardized, and the search logic is incorrect. Debugging method: Print the data structure and gradually debug the search function.

Performance optimization and best practices

• Data preprocessing: If the data is static, it can be preprocessed at loading, build indexes, and speed up search.
• Asynchronous search: For large data sets, asynchronous search can be considered to avoid blocking the main thread.

In short, the key to implementing the Vue and Element-UI cascaded drop-down box search function lies in efficient search algorithms and performance optimization. Don't blindly rely on the default functions of the framework. Sometimes you can create a more perfect solution by doing it yourself. Remember, the elegance and performance of the code are equally important!

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