how to display multi dimension array values on screen

// aap.component.html

<ul  *ngFor="let items of exceltoJson" >
  <li> {{ items }} </li>
</ul>
<input type="file" (change)="onFileChange($event)">


// app.component.ts

onFileChange(event: any) {
    this.exceltoJson = {};
    
    /* wire up file reader */
    const target: DataTransfer = <DataTransfer>(event.target);
    
    const reader: FileReader = new FileReader();
    reader.readAsBinaryString(target.files[0]);
    
    
    this.exceltoJson['filename'] = target.files[0].name;
    reader.onload = (e: any) => {
      /* create workbook */
      const binarystr: string = e.target.result;
      const wb: XLSX.WorkBook = XLSX.read(binarystr, { type: 'binary' });

      for (var i = 0; i < wb.SheetNames.length; ++i) {
      
        const wsname: string = wb.SheetNames[i];
        const ws: XLSX.WorkSheet = wb.Sheets[wsname];
      
        const data = XLSX.utils.sheet_to_json(ws);
        this.exceltoJson[`sheet${i + 1}`] = data;

       
        
      }


      
      console.log(this.exceltoJson);
    };

  }

Hi, using above code I get the data on console but I want to disply on screen in tabular form. This data is getting from multiple sheets from a single file.

I tried forEach, JSON.parse() but not able to get success. Can anyone help me how to display using angular

Answer

Consider that you know all sheets and they are fix.

You can

<ul  *ngFor="let items of exceltoJson[1]" >
  <li> {{ items }} </li>
</ul>

<ul  *ngFor="let items of exceltoJson[2]" >
  <li> {{ items }} </li>
</ul>

<input type="file" (change)="onFileChange($event)">

Or you can use a ngfor inside ngfor like @ataerg suggested

        <div *ngFor="let sheets of exceltoJson">
            <ul  *ngFor="let items of sheets " >
              <li> {{ items }} </li>
            </ul>
        </div>