The data structure must be clearly defined when the Vue and Element-UI cascaded drop-down boxes pass the props, and the direct assignment of static data is supported. If data is dynamically obtained, it is recommended to assign values ??within the life cycle hook and handle asynchronous situations. For non-standard data structures, defaultProps or convert data formats need to be modified. Keep the code simple and easy to understand with meaningful variable names and comments. To optimize performance, virtual scrolling or lazy loading techniques can be used.

Vue and Element-UI cascaded pull-down box props transfer value: in-depth analysis and practical skills

Many friends will encounter the problem of passing props values ??in cascading drop-down boxes when building forms with Vue and Element-UI. This question seems simple, but in fact it has hidden mystery. If you are not careful, you will fall into the pit. This article will explore this issue in depth, help you avoid common traps and write efficient and elegant code. After reading this article, you can not only solve this problem, but also improve your understanding of Vue component communication and data management.

To be clear, Element-UI's cascade selector itself supports configuring data through props , but this is only superficial. The real challenge is how to manage and pass this data effectively, especially when the data source is complex or requires dynamic updates.

Let’s review the basics first. There are many ways to communicate between Vue components, and props are a typical representative of the one-way data flow between parent and child components. Element-UI's el-cascader component is essentially a Vue component that receives external data through props and renders it into a cascading selector. The value of props is usually an array, and each item in the array represents a level of options. The structure is usually in the form { value: 'value', label: 'label', children: [] } .

Now, let's dive into props pass value of el-cascader . In the simplest scenario, your data can be written directly in props :

 <code class="vue"><template> <el-cascader v-model="value" :options="options" :props="defaultProps"></el-cascader> </template> <script> export default { data() { return { value: [], options: [ { value: &#39;zhejiang&#39;, label: &#39;浙江&#39;, children: [ { value: &#39;hangzhou&#39;, label: &#39;杭州&#39;, children: [ { value: &#39;xihu&#39;, label: &#39;西湖&#39; } ] } ] } ], defaultProps: { children: &#39;children&#39;, label: &#39;label&#39;, value: &#39;value&#39; } }; } }; </script></code>

This is just static data. In actual applications, the data is usually dynamic and may come from interface requests. At this time, you may need to get the data in created or mounted lifecycle hook function and assign it to options .

 <code class="vue"><script> import axios from &#39;axios&#39;; export default { data() { return { value: [], options: [], defaultProps: { children: &#39;children&#39;, label: &#39;label&#39;, value: &#39;value&#39; } }; }, mounted() { axios.get(&#39;/api/options&#39;).then(response => { this.options = response.data; }); } }; </script></code>

What you need to pay attention to here is asynchronous operations. If data acquisition fails, your cascading selector may not render properly. Therefore, a good error handling mechanism is essential. You should add catch blocks to handle possible errors and provide user-friendly tips.

In more complex cases, your data structure may not be in the standard { value, label, children } format. At this time, you need to specify the correct attribute name in defaultProps , or convert the data after the data is retrieved and convert it to the format expected by el-cascader .

Remember, efficient code is not only easy to run, but also easy to understand and maintain. Using meaningful variable names, adding necessary comments, and keeping the code concise are the keys to writing good code.

Finally, regarding performance optimization, if you have a large amount of data, rendering all data directly can cause performance problems. You might consider using virtual scrolling or lazy loading techniques to optimize performance. This requires a deeper understanding of Vue's rendering mechanism and Element-UI features. Remember, performance optimization is a continuous process that needs to be adjusted according to actual conditions. Don't optimize too early, make sure your code works properly before considering performance issues.

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