Tips for managing the data type of a bound value through ngModel: preventing number distortion to string

I posted a query and managed to solve it. However, I observed that even though the provided data consists of objects defined like this:

export interface GisPoint { e: number; n: number; }

when a user inputs a value, the original content changes from { e: 12, n: 34 } to something resembling a string, i.e. { e: "123", n: 34 }. I acknowledge that the input is treated as a string by default so I must convert it. Nevertheless, since the binding involves ngModel, I don't explicitly react to keyUp or blur.

Is there a need for me to explicitly handle those events? If I have to, then using ngModel doesn't seem necessary. It would be great if the type could be preserved when entering an edited value.

angulartypescriptngmodel

Answer №1

If you have this HTML code:

<input type="number" [(ngModel)]="data.age">

Your model will receive the number without it being converted to a string by Angular. One thing to note is that browsers may display number spinners alongside the input field.

To hide these spinners, you can simply add the following CSS rule:

/* Chrome, Safari, Edge, Opera */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Firefox */
input[type=number] {
  -moz-appearance:textfield;
}

For more information on customizing CSS for this purpose, check out this resource and this one.

You can see this in action on StackBlitz.

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