element table 自定义表尾

简单介绍下项目：后端管理系统，页面样式用的是 element，数据绑定用的是 vue.js。功能需求：需要添加缴药记录，这些记录要显示在一个 table 中，但是 table 末尾一行不做数据展示，只负责触发数据新增的动作。先看最终实现的效果：红框处就是自定义的表尾，选择药品处的下拉框，每当选中一个药品的时候，当前 table 就多出一行选中过的药品信息。实现过程：由于用到 ele...

荔枝1

2999人浏览 · 2020-02-18 10:30:34

荔枝1 · 2020-02-18 10:30:34 发布

简单介绍下项目：后端管理系统，页面样式用的是 element，数据绑定用的是 vue.js。

功能需求：需要添加缴药记录，这些记录要显示在一个 table 中，但是 table 末尾一行不做数据展示，只负责触发数据新增的动作。

先看最终实现的效果：
在这里插入图片描述

红框处就是自定义的表尾，选择药品处的下拉框，每当选中一个药品的时候，当前 table 就多出一行选中过的药品信息。

实现过程：

由于用到 element 的 table 标签，所以 table 的渲染，取决于 data 属性的值(tablelist)，代码如下


<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table</span><span class="token style-attr language-css"><span class="token attr-name">  <span class="token attr-name">style</span></span><span class="token punctuation">="</span><span class="token attr-value"><span class="token property">width</span><span class="token punctuation">:</span> 1040px</span><span class="token punctuation">"</span></span> <span class="token attr-name">:data</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>tablelist<span class="token punctuation">"</span></span> <span class="token attr-name">border</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span>  <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>drugName<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>药品名称<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span> <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>unit<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>用药规格<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span>  <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>stock<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>库存数量（本人）<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span> <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>number<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>缴存数量<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table</span><span class="token punctuation">&gt;</span></span>

一开始的思路是，tablelist 中预制一条数据，然后做状态标识。当渲染 table 行的时候，根据状态标识，判断该行到底是添加上的数据，还是要触发添加操作的表尾。然后按照这个思路执行的结果是：
在这里插入图片描述

然后反思，发现原因。每次添加，都往 tablelist 数组后面添加一个元素，导致本来应该是表尾的那一行，跑到了上面。那继续解决问题，我想到了对 tablelist 排序，然后让表尾那一行每次排在数组最后一个位置。虽然实现了，但是弊端也很大。1，每次排序都要涉及到数组遍历页面渲染，这些都是性能开销。2，当我保存页面的数据的时候，我还需要对 tablelist 的数据做筛选，剔除掉表尾那行数据。总而言之，逻辑很复杂，然后我就想出了另外一种方法。

先看代码


<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table</span><span class="token style-attr language-css"><span class="token attr-name">  <span class="token attr-name">style</span></span><span class="token punctuation">="</span><span class="token attr-value"><span class="token property">width</span><span class="token punctuation">:</span> 1040px</span><span class="token punctuation">"</span></span> <span class="token attr-name">:data</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>tablelist.concat([{drugId:0}])<span class="token punctuation">"</span></span> <span class="token attr-name">border</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span>  <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>drugName<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>药品名称<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span> <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>unit<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>用药规格<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span>  <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>stock<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>库存数量（本人）<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-table-column</span> <span class="token attr-name">prop</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>number<span class="token punctuation">"</span></span> <span class="token attr-name">label</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>缴存数量<span class="token punctuation">"</span></span> <span class="token attr-name">min-width</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>20%<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table-column</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-table</span><span class="token punctuation">&gt;</span></span>

首先，为了保证保存页面数据的时候，处理逻辑简单，只让 tablelist 存储需要提交到后台的数据。那么 table 表格末尾那一行的数据，怎么渲染上呢。在给 table 的 data 属性赋值的时候，调用 tablelist 的 concat()，方法。给 tablelist 再添加一个数组，该数组只有一个元素，就是用来渲染表尾的元素。这样就保证了提交到后台数据准确性，table 行数据排列的准确性以及表尾行始终固定。

总结

其实解决的方法很简单。第一，由于是表尾和其他行有区别，而且我们的业务逻辑是表尾数据不提交，所以想到两部分数据要做数据隔离。第二，table 渲染的时候，又需要两部分数据是一个整体，所以想到集合的相加。

多思考，总会有意想不到的收获。

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