How to adjust hover style and logic of merged rows in el-table in Element UI?

Customize the hover effect of Element UI el-table merge

The default behavior of the Element UI's el-table component may not meet all needs when dealing with hover styles of merged rows ( rowspan ). This article will explore how to customize the hover effect of merged rows to achieve two common scenarios: local highlighting and whole line highlighting.

Demand scenarios

Assuming an el-table table contains merged rows, we want to achieve the following two hover effects:

1. Local highlighting (effect 1): When the mouse hovers over any row of a merged row, it will only highlight the row and its cells to the right, or only highlight a specific column. This requires precise control of the highlighted area.

   

2. Highlight the entire row (effect 2): When the mouse hovers over any row of the merge row, the entire merge row will be highlighted, including all cross-row cells.

   

Implementation plan

This requires the combination of CSS style customization and JavaScript dynamic control class names. The following provides an improved solution:

<template>
  <el-table ref="table" :data="tableData" :span-method="arraySpanMethod">
    </el-table></template>

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