The interpolation error in Angular is causing an undefined result to occur

I am currently facing an interpolation issue that involves working with data from an API in the following format:

{columna1=6.022, columna2=0.0, columna3=3.14.....,columnaN=5.55 }

There are instances where there is only one 'columna', while in some cases there could be up to 30 'columna'. To easily interpolate them, I have implemented the following code in an HTML file:

<ng-container *ngFor="let numero of arregCols">
   <p>columna{{numero}} =  {{ columna[numero] }}</p>
</ng-container>

In my component.ts file:

  for (let xk = 1; xk < maxCols; xk++) {
      this.arregCols[this.arregCols.length] = xk.toString();
  }

I am not sure if my approach to interpolation is correct.

The expected output should be:

columna1 = 6.022
columna2 = 0.0
columna3 = 3.14
...
columnaN = 5.55

However, instead of the desired result, I encounter the error message:

ERROR TypeError: Cannot read properties of undefined
angulartypescriptruntime-errorundefinedinterpolation

Answer №1

To extract data from an object using Angular, you can utilize the keyvalue pipe.

In your component.ts file:

  data = {
    column1:6.022, 
    column2:0.0, 
    column3:3.14,
    columnN:5.55 
  }

In your component.html file:

<div *ngFor="let item of data| keyvalue">
    {{ item.key }} = {{ item.value }}
  </div>

This code snippet will display:

column1 = 6.022
column2 = 0
column3 = 3.14
columnN = 5.55

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