使用角材料创建动态矩阵表(如数学矩阵) [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，例如矩阵m*n.您可以在此处上找到该结构.

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.

我想在 mat-table 上显示json (above photo).但是我无法正确分配数据到表，并且在mat-的所有行上都显示了table.show column0上的重复数据.桌子.

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为

while Correct data in table should be

我的代码可在 stackblitz 上获得.

在此代码中，我要创建具有5 col和6行的表.

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

当您拥有矩阵时，您将拥有FormArrays的FormArray，例如.如果您有类似

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(**)一样格式化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))
  )))

使用mat表时，您需要一个"displayedColumns"，这是一个包含要显示的列的数组.如果您希望有一个删除"按钮，则可以使用更多其他变量

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')

好了，快要准备好了，我添加了更多新变量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>; 

我们的表已经准备好显示:

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)，是的"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(*)

我添加了两个添加和删除行的功能

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，我添加了一条指令，允许使用箭头键在单元格之间移动

(*) In the stackblitz I added a directive to allow move across cells using arrows keys

(**)您的情况是将Array格式设置为

(**) 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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