how to add the placeholder value to ngmodel - placeholder

Question

I am following an example in primeng in which I can add a new row to a table. Everything "seems" to work as long as I fill out all the fields in the input option. However, I want to add the place holder value to the NGmodel if the user does not change the value of the input. I tried everything (ng-init, ngvalue, etc etc) but I can never get the ngmodel to carry the value in the place holder... and the table gets fill with the 3 filled fields but not the one where the user did not type anything.
extract of the HTML....
<div class="ui-g-12">
<div class="ui-g-4">
<label for="product_line_id">Product ID</label>
</div>
<div class="ui-g-8">
<input pInputText id="product_line_id" [ngModel]="myproduct.product_line_id" placeholder="{{ lastproductline + 1}}" />
</div>
</div>
<div class="ui-g-12">
<div class="ui-g-4">
<label for="product_line_1">Product</label>
</div>
<div class="ui-g-8">
<input pInputText id="product_line_1" [(ngModel)]="myproduct.product_line_1" autofocus />
</div>
</div>
<div class="ui-g-12">
<div class="ui-g-4">
<label for="product_line_2">Category</label>
</div>
<div class="ui-g-8">
<input pInputText id="product_line_2" [(ngModel)]="myproduct.product_line_2" />
</div>
</div>
<div class="ui-g-12">
<div class="ui-g-4">
<label for="product_line_3">Sub Category</label>
</div>
<div class="ui-g-8">
<input pInputText id="product_line_3" [(ngModel)]="myproduct.product_line_3" />
</div>
</div>
the ts file looks something like...
productlines = [];
myproduct: { [s: string]: ProductLines; } = {};
showDialogToAdd() {
this.newProductLine = true;
this.myproduct = {};
this.displayDialog = true;
}
save() {
let productlines = [...this.productlines];
productlines.push(this.myproduct);
this.finalproductchanges.push(this.myproduct)
this.productlinesClone = productlines;
this.myproduct = null;
this.displayDialog = false;
}
Any ideas will be greatly appreciated

Answer 1

I managed to change the code by adding the field directly in the controller.