In order to determine the rowspan for each item in a table, we need to calculate how many rows it should span based on where its value first appears. The resulting data structure could resemble the following:
const rows = [
{val1: 'a', val1Rowspan: 3}, // Value 'a' appears first and spans 3 rows
{val1: 'a'}, // Same value as above, no rowspan needed
{val1: 'a'}, // Same value as above, no rowspan needed
{val1: 'b', val1Rowspan: 1}, // Value 'b' appears first and spans 1 row
{val1: 'c', val1Rowspan: 2}, // Value 'c' appears first and spans 2 rows
{val1: 'c'}, // Same value as above, no rowspan needed
]
This logic can be implemented effectively using v-for in Vue.js:
<table>
<tr v-for="row of rows">
<td
v-if="row.val1Rowspan"
:rowspan="row.val1Rowspan"
>{{ row.val1 }}</td>
</tr>
</table>
const { createApp, ref } = Vue;
const App = {
template: `
<table>
<tr v-for="(row, index) of rows">
<td>{{index}}</td>
<td
v-if="row.val1Rowspan"
:rowspan="row.val1Rowspan"
>{{ row.val1 }}</td>
</tr>
</table>
`,
data() {
return {
rows: [
{val1: 'a', val1Rowspan: 3},
{val1: 'a'},
{val1: 'a'},
{val1: 'b', val1Rowspan: 1},
{val1: 'c', val1Rowspan: 2},
{val1: 'c'},
]
}
}
}
const app = createApp(App)
app.mount('#app')
td{
border: 1px solid black;
padding: 8px;
}
<div id="app"></div>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
To calculate the rowspans, a nested loop can be utilized where the outer loop sets the current value, the inner loop tallies the elements with the same value, assigns that count as the rowspan, and then advances to the first element with the next value. This process needs to be repeated for each column requiring a rowspan.
Does this explanation resonate with you? Does this method suit your requirements?