Vue and Element-UI cascaded drop-down box custom template

Customizing the Vue and Element-UI cascading drop-down box template involves the following steps: Understand how the cascading selector works and Vue's slot mechanism. Use scoped-slot in el-cascader to define custom templates. Use node and data variables to get the current node information and the original data. Display data flexibly according to your needs, such as icons or different styles. Note that the data structure complies with Element-UI requirements and use scoped-slot correctly. In conjunction with the state management tool to handle asynchronous data loading. Use browser developer tools to locate issues.

Vue and Element-UI cascaded drop-down box custom template: deep customization, play with data

Many friends will encounter the situation when using Vue and Element-UI to do projects, the cascading selector style provided by Element-UI does not match the design draft. This article will explore in-depth how to customize the cascade selector template of Element-UI, and I will share some pitfalls and solutions that I personally encountered in actual projects to help you avoid detours.

Let’s talk about the conclusion first: The core of a custom template is to understand how the cascading selector of Element-UI works and how to cleverly utilize Vue’s slot mechanism. Don't be scared by those complicated documents, it's not that difficult.

Let’s briefly review the relevant knowledge points. Vue's componentization idea, and Element-UI as Vue's UI component library, provides a rich variety of components, including cascading selectors. Element-UI's cascade selector itself provides the functionality of custom templates, which is where we take advantage of it.

The core of the Element-UI cascade selector is the el-cascader component, which allows you to define data structures through props attributes in props , and customize displayed templates through scoped-slot . This part is available in the official Element-UI documents, but the documents are often simple and you will encounter many detailed problems in actual applications.

Let's look at a simple example, assuming your data structure is like this:

 <code class="javascript">const data = [ { value: '1', label: '省份A', children: [ { value: '1-1', label: '城市A1' }, { value: '1-2', label: '城市A2' } ] }, { value: '2', label: '省份B', children: [ { value: '2-1', label: '城市B1' } ] } ];</code>

The easiest custom template, just use scoped-slot in el-cascader :

 <code class="vue"><el-cascader :options="data" :props="{ value: 'value', label: 'label', children: 'children' }"> <template node data> <span>{{ node.label }}</span> <!-- 显示节点标签--> </template> </el-cascader></code>

This code is simple, it directly displays the labels of each node. But in actual applications, you need more complex logic, such as displaying icons, different styles, etc. Here, node contains all the information of the current node, data is the original data. You can use them flexibly according to your needs.

Now let’s talk about advanced usage. For example, if you want to display an icon behind each node, you can write it like this:

 <code class="vue"><template node data> <span>{{ node.label }} <i class="el-icon-location"></i></span> </template></code>

For example, you want to display different styles according to the hierarchy of the node:

 <code class="vue"><template node data> <span :class="{'province': node.level === 0, 'city': node.level === 1}"> {{ node.label }} </span> </template> <style scoped> .province { color: blue; } .city { color: green; } </style></code>

Here I used node.level to determine the level of the node. Remember, flexibly using CSS class names allows you to easily control styles.

Finally, let’s talk about your experience in trampling on pitfalls. The most common pitfall is the problem of data structure. Be sure to make sure your data structure meets the requirements of Element-UI, otherwise an error will be displayed. Another common pitfall is the use of scoped-slot . You must understand the meaning of the two variables node and data in order to use them correctly. Also, don't forget to handle asynchronous data loading, which requires combining Vuex or other state management tools. Remember, debugging tools are your good friends. Learning to use browser developer tools can help you locate problems quickly.

In short, it is not difficult to customize the Element-UI cascade selector template. The key is to understand its working principle and flexibly apply Vue's features. Practice more and summarize more, and you can become a master of custom templates!

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