使用有角度的材料创建类似数学矩阵的动态垫表 [英] create dynamic mat-table like math matrix with angular material
问题描述
我在创建表时遇到一个问题.我的结构数据是动态的,这意味着行数和列数是可变的,如矩阵 m*n
.和 struct 可在
I have one problem on create table. My struct data is dynamic,that means number of row and column is variable like matrix m*n
. and struct is available on here.
我想将 json(上图)
显示到 mat-table.但我无法正确地将数据分配给表,它在 table.show 上显示重复数据column0
用于 mat-table 的所有行.
I want to show json (above photo)
to mat-table.but I can't correctly assign data to table and it show Duplicate data on table.show column0
for all rows of mat-table.
而表中的正确数据应该是
while Correct data in table should be
我的代码可在 stackblitz 上找到.
My code is available on stackblitz.
在这段代码中,我想用 5
col 和 6
行创建表.
in this code,i want create table with 5
col and 6
row.
我该如何解决并显示此表中的所有数据?
推荐答案
当你有一个矩阵时,你就有一个 FormArray 的 FormArrays,例如如果你有这样的数据
when you has a matrix you has a FormArray of FormArrays,e.g. If you has a data like
export const data=[['uno','one'],['dos','two'],['tres','three']]
您可以像 (**) 那样格式化 FormArray 的 formArray
You can format a formArray of FormArray like (**)
myformArray = new FormArray(
data.map(row=>new FormArray(
row.map(x=>new FormControl(x))
)))
当您使用 mat 表时,您需要一个displayedColumns",一个包含您想要显示的列的数组.如果你想要一个按钮删除",你可以使用另一个变量更多
When you use a mat table you need a 'displayedColumns', an array with the columns you want display. If you want has a button "delete", you can use another variable more
displayedHeads: string[] = data[0].map((x,index)=>'col'+index);
displayedColumns: string[] = this.displayedHeads.concat('delete')
好吧,快准备好了,我添加了一个新变量 more 来指示您拥有的列数 - 这允许我们添加新行 - 以及使用 viewChild 的表
Well, It's close to be ready, I added a new variable more that indicate the number of columns you has -this allow us add a new row-, and the table using viewChild
columns: number = data[0].length;
@ViewChild(MatTable, { static: true }) table: MatTable<any>;
我们的表格已经准备好展示了:
Our table it's ready to show it:
<button mat-button (click)="add()">Add row</button>
<table mat-table [dataSource]="myformArray.controls" class="mat-elevation-z8">
<!-- Name Column -->
<ng-container *ngFor="let head of displayedHeads;let j=index" [matColumnDef]="head">
<th mat-header-cell *matHeaderCellDef> {{head}} </th>
<td mat-cell *matCellDef="let element">
<input [formControl]="element.at(j)">
</td>
</ng-container>
<ng-container matColumnDef="delete">
<th mat-header-cell *matHeaderCellDef></th>
<td mat-cell *matCellDef="let element;let i=index;">
<button mat-button (click)="delete(i)">delete</button>
</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
看到 dataSource 是 myformArray.controls
并且在输入中是 [formControl]="element.at(j)
, yes "element 是内部 formArray"
See that the dataSource is myformArray.controls
and in the input is [formControl]="element.at(j)
, yes "element is the inner formArray"
您可以在 stackblitz 中查看示例 (*)
我添加了两个函数来添加和删除行
I add two functions to add and remove row
delete(index: number) {
this.myformArray.removeAt(index);
this.table.renderRows()
}
add() {
const empty = [];
for (let i = 0; i < this.columns; i++)
empty.push(true)
this.myformArray.push(
new FormArray(empty.map(x => new FormControl('')))
)
this.table.renderRows()
}
(*) 在 stackblitz 中,我添加了一个指令以允许使用箭头键跨单元格移动
(*) In the stackblitz I added a directive to allow move across cells using arrows keys
(**) 在您的情况下,您将表单 Array 格式化为
(**) In your case you format the form Array as
myformArray = new FormArray(
data.map(row=>new FormArray(
row.map(x=>new FormControl(x.c))
)))
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