基于dataSource对象数组属性大小的Angular Material Table行跨列 [英] Angular Material Table rowspan columns based on dataSource object array property size
问题描述
即使在Angular Material 7.2版中，我似乎也找不到如何在mat-table上使用rowpan并保持组件功能的示例.
Even now in version 7.2 of Angular Material, I can't seem to find examples on how to use rowspan on mat-table and keep the component functionality.
这有多远(简短?):
https://stackblitz.com/edit/angular-wudscb
上面Stackblitz中的示例几乎是我正在寻找的东西，但是我看不到如何完成它.
The example in the Stackblitz above is "almost" what I am looking for, but I am not being able to see how to finish it.
...
===============================================
|| || || || row1 ||
|| 1 || Hydrogen || 1.0079 ||========||
|| || || || row2 ||
===============================================
|| || || || row1 ||
|| || || ||========||
|| 2 || Helium || 4.0026 || row2 ||
|| || || ||========||
|| || || || row3 ||
===============================================
|| || || || row1 ||
|| 3 || Lithium || 6.941 ||========||
|| || || || row2 ||
===============================================
...
可以在以下位置找到使用其他元数据格式的示例:
An example using other metadata format can be found in:
https://stackblitz.com/edit/angular-lnahlh
在我的Stackblitz(第一个链接)之后，我的问题是:
Following my Stackblitz (the first link), my questions are:
我距离实现这种跨行填充/hack太远了吗?
Am I too far of achieving this rowspan shim/hack?
如何根据行['descriptions']大小的长度来循环行?
How do I loop the rows based on the lenght of the row['descriptions'] size?
如果我在对象内有另一个数组属性怎么办?我可以迭代并生成具有其大小的column/rows/rowspan，这样它会变得更通用吗?
What If I had another array property inside the object? Could I iterate and generate the columns/rows/rowspan with its size, so it would become more generic?
我正在尝试为社区找到通用的解决方案.
I'm trying to find a generic solution for the community.
推荐答案
好吧，材料表似乎没有api文档，我也找不到任何技巧，但是我们可以将数据发送给支持这一点，根据您的第二个示例，我们可以将数据重新格式化为新的json并获得预期的结果.
Well, it seems that material table has no api documentation for it, I could not find any trick to do this too, But we can twick the our data to support this, as per your second example we can reform the data to new json and we can get our expected result.
const originalData = [
{ id: 1, name: 'Hydrogen', weight: 1.0079, descriptions: ['row1', 'row2'] },
{ id: 2, name: 'Helium', weight: 4.0026, descriptions: ['row1', 'row2', 'row3'] },
{ id: 3, name: 'Lithium', weight: 6.941, descriptions: ['row1', 'row2'] },
{ id: 4, name: 'Beryllium', weight: 9.0122, descriptions: ['row1', 'row2', 'row3'] },
{ id: 5, name: 'Boron', weight: 10.811, descriptions: ['row1'] },
{ id: 6, name: 'Carbon', weight: 12.0107, descriptions: ['row1', 'row2', 'row3'] },
{ id: 7, name: 'Nitrogen', weight: 14.0067, descriptions: ['row1'] },
{ id: 8, name: 'Oxygen', weight: 15.9994, descriptions: ['row1'] },
{ id: 9, name: 'Fluorine', weight: 18.9984, descriptions: ['row1', 'row2', 'row3'] },
{ id: 10, name: 'Neon', weight: 20.1797, descriptions: ['row1', 'row2', 'row3'] },
]; //original data
const DATA = originalData.reduce((current, next) => {
next.descriptions.forEach(b => {
current.push({ id: next.id, name: next.name, weight: next.weight, descriptions: b })
});
return current;
}, []);//iterating over each one and adding as the description
console.log(DATA)
const ELEMENT_DATA: PeriodicElement[] = DATA; //adding data to the element data
步骤2
这将是您的第二个stackblitz链接.
Step 2
this will be as it is as your second stackblitz link.
getRowSpan(col, index) {
return this.spans[index] && this.spans[index][col];
}
步骤3
与您的第二个链接一样
Step 3
as it is as per your second link
constructor() {
this.cacheSpan('Priority', d => d.id);
this.cacheSpan('Name', d => d.name);
this.cacheSpan('Weight', d => d.weight);
}
/**
* Evaluated and store an evaluation of the rowspan for each row.
* The key determines the column it affects, and the accessor determines the
* value that should be checked for spanning.
*/
cacheSpan(key, accessor) {
for (let i = 0; i < DATA.length;) {
let currentValue = accessor(DATA[i]);
let count = 1;
// Iterate through the remaining rows to see how many match
// the current value as retrieved through the accessor.
for (let j = i + 1; j < DATA.length; j++) {
if (currentValue != accessor(DATA[j])) {
break;
}
count++;
}
if (!this.spans[i]) {
this.spans[i] = {};
}
// Store the number of similar values that were found (the span)
// and skip i to the next unique row.
this.spans[i][key] = count;
i += count;
}
}
步骤4
使用索引向下传递到rowpan并隐藏不需要的行
Step 4
Using index to pass down to rowspan and hiding the rows where it doesn't needed
<ng-container matColumnDef="id">
<th mat-header-cell *matHeaderCellDef> Priority </th>
<td mat-cell *matCellDef="let data;let i = dataIndex" [attr.rowspan]="getRowSpan('Priority',i)" [style.display]="getRowSpan('Priority', i) ? '' : 'none'">
{{ data.id }} </td>
</ng-container>
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef> Name </th>
<td mat-cell *matCellDef="let data;let i = dataIndex" [attr.rowspan]="getRowSpan('Name',i)" [style.display]="getRowSpan('Name', i) ? '' : 'none'">
{{ data.name }} </td>
</ng-container>
<ng-container matColumnDef="weight">
<th mat-header-cell *matHeaderCellDef> Weight </th>
<td mat-cell *matCellDef="let data;let i = dataIndex" [attr.rowspan]="getRowSpan('Weight',i)" [style.display]="getRowSpan('Weight', i) ? '' : 'none'">
{{ data.weight }} </td>
</ng-container>
<ng-container matColumnDef="descriptions">
<th mat-header-cell *matHeaderCellDef> Descriptions </th>
<td mat-cell *matCellDef="let data"> {{ data.descriptions }} </td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
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