How can I get the count of rows in my uploaded excel

I have uploaded an excel and need to read it and get the count of the number of rows in it.

I have tried the below codes but it doesn't seen to work out.

I have been getting so many errors like,"_fs.readFileSync is not a function" "f.slice is not a function" and currently I am stuck at "input.replace is not a function". Please let me know where am I going wrong or what actually needs to be done

Component.ts

<pre>

proceedUpload(){

if(this.file != null) {


var workbook = XLSX.read(this.file);


var firstSheet = workbook.SheetNames[0];


var excelRows = XLSX.utils.sheet_to_json(workbook.Sheets[firstSheet]);
var number = excelRows.length();

if( number > 0 )
{
this.uploadMessage = true;
}
else
{
this.uploadMessage = false;
}


let formData: FormData = new FormData();
formData.append('Files', this.file);

this.http.post("Url", formData).map(res => res.json())
.catch(error => Observable.throw(error))
.subscribe(
data => console.log('success'),
error => console.log(error)
)

}
else
{
alert("Please upload a file!")
}
</pre>


Component.html

<div *ngIf="uploadMessage">
<p>{{number}} uploaded!!</p>
</div>

Continue reading...