overwriting html input field value

html input pattern
html form
html <input value
html input list
html required field validation
html input form attribute
html input dropdown
html input validation

I'm new with angular and I'm trying to restrict possible values in a number input field.

I want the values to be above 0 and to never show any other value within the field.

I tried doing this by setting min parameter but that only works for the arrows. I still can insert the value manually (eg. typing -10).

I am able to override the value within the component, but the input field still shows invalid value.

How can I overwrite the input field value when I detect that there is wrong input?

For example: I type in -10, and the input field immediately shows 1.

html code:

<p>
  <input type="number" [ngModel]="numberValue" (ngModelChange)='onInputChange($event)' 
   min=1>
</p>

component code:

import { Component, OnInit } from '@angular/core';


@Component({
  selector: 'app-test',
  templateUrl: './test.component.html',
  styleUrls: ['./test.component.css']
})


export class TestComponent implements OnInit {
    numberValue:number = 1;
    ngOnInit(){
    }
    onInputChange(value:number){
    this.numberValue = Math.max(1,value);
      }
    }

HTML code.

<p>
  <input type="number" [(ngModel)]="numberValue" (ngModelChange)='onInputChange($event)' 
   min=1>
</p>

Use both bracket and parentheses with ngModel like this [(ngModel)]="numberValue"

Angular class.

import { Component, OnInit, ChangeDetectorRef } from '@angular/core';

@Component({
  selector: 'app-test',
  templateUrl: './test.component.html',
  styleUrls: ['./test.component.css']
})

export class TestComponent implements OnInit {
  numberValue: number = 1;

  constructor(private cdRef: ChangeDetectorRef) { }

  ngOnInit() { }

  onInputChange(value: number) {
    this.cdRef.detectChanges();
    this.numberValue = Math.max(1, value);
  }
}

use ChangeDetectorRef to update ngModel.

angular - overwriting html input field value, I am able to override the value within the component, but the input field still shows invalid value. How can I overwrite the input field value when I  This property set/return the value of value attribute of a text field. The value property contains the default value, the value a user types or a value set by a script. Syntax: Return the value property: Property Values: text:It specifies the value of input text field. attributeValue:This parameter is required.


I think you have misspeled the syntax of [(ngModel)] (banana in the box). So you need to update your html file like this:

<p>
  <input type="number" [(ngModel)]="numberValue" (ngModelChange)='onInputChange($event)' 
   min=1>
</p>

In your component ts file, you can access the value of the $event passed into the onInputChange() function like this:

onInputChange(event){
    this.numberValue = Math.max(1,event.target.value);
}

Hope it helps!

HTML Input Attributes, The value of a read-only input field will be sent when submitting the form! Example. A read-only input field: <form> <label for  The value attribute specifies the value of an <input> element. For "checkbox", "radio", "image" - it defines the value associated with the input (this is also the value that is sent on submit) Note: The value attribute cannot be used with <input type="file">. The numbers in the table specify the first browser version that fully supports the


You need to change your html and typescript file also as shown below In HTML

<p> <input type="number" [(ngModel)]="numberValue" (keyup)='onInputChange($event)' min=1></p>

In Typescript

onInputChange(e){
this.numberValue = Math.max(1,e.target.value);
  }

<input type="search">, input elements of type search are text fields designed for the user to a numeric value that lets you override the maximum number of entries to  The defaultValue property sets or returns the default value of a text field. Note: The default value is the value specified in the HTML value attribute. The difference between the defaultValue and value property, is that defaultValue contains the default value, while value contains the current value after some changes have been made.


HTML attribute reference, Elements in HTML have attributes; these are additional values that The attribute can be used with form controls (such as the value of If this attribute is specified, it overrides the enctype attribute of the button's form owner. Definition and Usage. The <input type="hidden"> defines a hidden input field. A hidden field let web developers include data that cannot be seen or modified by users when a form is submitted. A hidden field often stores what database record that needs to be updated when the form is submitted. Note: While the value is not displayed to


Input Disabled HTML Attribute Explained For Inexperienced Coders », If a field is disabled , the value of the field is not sent to the server when the form is It is possible for a malicious user to override your form input's disabled  The Input Text defaultValue Property in HTML DOM is used to set or return the default value of the Text Field. This property is used to reflect the HTML value attribute. The main difference between the default value and value is that the default value indicate the default value and the value contains the current value after making some chan


Uncontrolled Components – React, In a controlled component, form data is handled by a React component. lifecycle, the value attribute on form elements will override the value in the DOM. In HTML, an <input type="file"> lets the user choose one or more files from their​  A typical implementation of autocomplete simply recalls previous values entered in the same input field, but more complex forms of autocomplete can exist. For instance, a browser could integrate with a device's contacts list to autocomplete email addresses in an email input field. See Values in The HTML autocomplete attribute for permitted values.