How to achieve multi-casual linkage between Vue3 and Element-Plus

It is convenient to directly use Element-Plus' Select component nesting to achieve multi-level linkage. Although it is convenient, the efficiency is worrying. The core lies in how to efficiently manage and update data at the data layer, process data using recursive functions, and manage selection state with ref. Pay attention to details such as asynchronous operations, data consistency, error handling and loading status prompts. Code is just a tool, and what is important is design ability and performance sensitivity.

Multi-stage linkage between Vue3 and Element-Plus: not only code, but also thinking

Many friends asked me how to achieve multi-level linkage between Vue3 and Element-Plus. This question seems simple, but it actually has a secret. On the surface, it is nothing more than a combination of several Select components, but truly gracefully solving this problem requires a deep understanding of data structures, component communications, and performance optimization. After reading this article, you can not only write out the code, but also understand the design ideas behind it and avoid falling into common pitfalls.

Let’s talk about the conclusion first: It is convenient to directly use Element-Plus’ Select component nesting to achieve multi-level linkage. Although it is convenient, the efficiency is worrying, especially when the data volume is large. Why? Because each selection of the superior will trigger the re-rendering of the subordinate component, which will create a performance bottleneck.

We have to change our thinking. The core lies in how to manage and update data efficiently. Instead of allowing components to render frequently, it is better to make a fuss in the data layer. I recommend using a recursive function to process the data and using ref to manage the selection state.

Let's look at the code, this is not a simple copy-paste:

 <code class="javascript"><template> <div> <el-select v-model="selectedLevel1"> <el-option v-for="item in level1Options" :key="item.value" :label="item.label" :value="item.value"> </el-option> </el-select> <el-select v-model="selectedLevel2" v-if="selectedLevel1"> <el-option v-for="item in level2Options" :key="item.value" :label="item.label" :value="item.value"> </el-option> </el-select> <el-select v-model="selectedLevel3" v-if="selectedLevel2"> <el-option v-for="item in level3Options" :key="item.value" :label="item.label" :value="item.value"> </el-option> </el-select> </div> </template> <script> import { ref, computed } from &#39;vue&#39;; export default { setup() { const level1Options = ref([ { value: &#39;A&#39;, label: &#39;选项A&#39; }, { value: &#39;B&#39;, label: &#39;选项B&#39; }, ]); const level2Options = ref([]); const level3Options = ref([]); const selectedLevel1 = ref(&#39;&#39;); const selectedLevel2 = ref(&#39;&#39;); const selectedLevel3 = ref(&#39;&#39;); const handleLevel1Change = (val) => { // 根据val 获取level2Options 数据，这部分逻辑根据你的数据源决定// 例如：从后端获取，或从本地数据中筛选fetchLevel2Data(val); selectedLevel2.value = &#39;&#39;; // 清空下级选择selectedLevel3.value = &#39;&#39;; // 清空下级选择}; const handleLevel2Change = (val) => { // 同理，获取level3Options 数据fetchLevel3Data(val); selectedLevel3.value = &#39;&#39;; // 清空下级选择}; const fetchLevel2Data = async (level1Value) => { // 模拟异步获取数据await new Promise(resolve => setTimeout(resolve, 500)); level2Options.value = level1Value === &#39;A&#39; ? [{ value: &#39;A1&#39;, label: &#39;A1&#39; }, { value: &#39;A2&#39;, label: &#39;A2&#39; }] : [{ value: &#39;B1&#39;, label: &#39;B1&#39; }]; }; const fetchLevel3Data = async (level2Value) => { // 模拟异步获取数据await new Promise(resolve => setTimeout(resolve, 500)); level3Options.value = level2Value === &#39;A1&#39; ? [{ value: &#39;A11&#39;, label: &#39;A11&#39; }] : []; }; return { level1Options, level2Options, level3Options, selectedLevel1, selectedLevel2, selectedLevel3, handleLevel1Change, handleLevel2Change, }; }, }; </script></code>

The key to this code is fetchLevel2Data and fetchLevel3Data functions, which simulate the process of obtaining data from the server. In actual applications, you need to modify this part of the code according to your data interface. Remember, asynchronous operations are important to avoid blocking the main thread.

In addition, pay attention to the clearing operations of selectedLevel2 and selectedLevel3 , which can ensure the consistency of the data. Don't underestimate these details, they can avoid many weird bugs.

Finally, don't forget to consider error handling and loading status prompts to make the user experience better. This article is just a stolen idea. In actual projects, you may need more complex logic, such as caching data, optimizing data structures, etc. Remember, code is just a tool, and more importantly, your design capabilities and sensitivity to performance. I wish you to write elegant and efficient multi-level linkage components!

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