how can one exhibit the value of an object in TypeScript

Does anyone know how to properly display object values in forms using Angular? I can see the object and its values fine in the browser developer tools, but I'm having trouble populating the form with these values.

In my *.ts file:

console.log(this.product),              // {"productId": "3", "productName": "G500 cpu", "productDescription": "gaming computer", "productCategory": "computers", "units": 5 }
this.updateForm.patchValue({
        // productId: '23128',                // display 23128
        //   productName: 'asdas',            // display asdas
        productId: this.product.productId,    // doesn't display anything
        productName: this.product.productName // doesn't display anything
        // productId: this.product,    // display [object Object]
        // productName: this.product // display [object Object]
      })

In my *.html file:

    <form [formGroup]="updateForm">
      <div class="form-group">
        <input
        type="text"
        class="form-control"
        formControlName="productId">
      </div>
      <div class="form-group">
        <input
          type="text"
          class="form-control"
          formControlName="productName"
        />
      </div>

Answer №1

Instead of simply assigning values to each form control, it is important to ensure that the form control names match the object variable names.

Check out this stackblitz example for reference.

this.updateForm = this.formBuilder.group({
      productId: new FormControl(''),
      productName: new FormControl(''),
      productDescription: new FormControl(''),
      productCategory: new FormControl(''),
      units: new FormControl('')
    });
    
    var product = {
      productId: "3",
      productName: "G500 cpu",
      productDescription: "gaming computer",
      productCategory: "computers",
      units: 5 
    };
    this.updateForm.patchValue(product);

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