How to validate empty textbox and minimum length in ember.js?

@aniya.jaskolski 

To validate an empty textbox and enforce a minimum length in Ember.js, you can use Ember's built-in validations library called Ember-Validations. Here's an example of how you can achieve this:

1. First, install Ember-Validations by running the following command in your Ember project directory:

1

ember install ember-validations

1. Define a validation mixin in your Ember component or controller where you want to perform the validation. For example:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11

import Ember from 'ember';
import { validatePresence, validateLength } from 'ember-validations/constraints';

export default Ember.Mixin.create({
  validations: {
    textboxValue: [
      validatePresence(true),
      validateLength({ min: 5 }),
    ]
  }
});

1. In your component or controller's template, bind the value of the textbox to a property in your model or component, and use Ember's {{input}} helper with the validate attribute to trigger the validation:

1

{{input value=textboxValue validate=(v-get-validator model 'textboxValue')}}

In this example, textboxValue is the property bound to the textbox's value, and it will be validated for presence and a minimum length of 5 characters.

1. Handle the validation error messages in your template by using the errors-for helper provided by Ember-Validations:

1
2
3

{{#if (v-get model 'textboxValue.validation')}} 
  <span class="error">{{v-get model 'textboxValue.message'}}</span> 
{{/if}}

With these steps, you should be able to validate an empty textbox and enforce a minimum length in Ember.js using Ember-Validations.