An Angular Form Builder

Angular Form Builder is a form developer library that gives users the power to create forms using a JSON schema as input. This is based on the official Angular dynamic forms guide.

It fully automates form UI creation by introducing a set of maintainable form control models and dynamic form control components

Out of the box support is provided for Material.

Explore it live in action!

Supported Form Controls

Here is the list of form controls which are currently supported by the module. In order to make the form controls look pretty, we have used Angular Material:

1. Checkboxes (Group)
2. Radio Button (Group)
3. Plain input (Text, Number)
4. Select

Installation

Install the core package:

npm i angular-form-builder --save

Basic Usage

1. Import FormBuilderModule:

import { FormBuilderModule } from "angular-form-builder";
// ...

@NgModule({
    
    imports: [
      FormBuilderModule
      // ...
    ]
})

export class AppModule {}

2. Define your form model: You can provide a form model in plain JSON.

const questions = [
    {
        type: 'INPUT',
        id: 'sampleInput',
        label: 'Sample Input',
        maxLength: 42,
        placeholder: 'Sample input'
    },
    {
        type: 'RADIO_GROUP',
        id: 'sampleRadioGroup',
        label: 'Sample Radio Group',
        options: [
            {
                label: 'Option 1',
                value: 'option-1',
            },
            {
                label:'Option 2',
                value: 'option-2'
            },
            {
                label: 'Option 3',
                value: 'option-3'
            }
        ],
        value: 'option-3'    
    }
    {
        type: 'CHECKBOX',
        id: 'sampleCheckbox',
        label: 'I do agree'
    }
]

const displayFields = (form) => {
  console.log(form.getRawValue()); // The aggregate value of the FormGroup, including any disabled controls.
  console.log(form.value); // The aggregate value of the FormGroup, excluding any disabled controls.
}

3. Add a AngularFormComponent to your template and bind its [questions] property and (formValue) event:

<angular-form-builder 
  [questions]="questions" 
  title="Testing Library" 
  (formSubmit)="displayFields($event)" 
  (formReset)="displayFields($event)"
>
</angular-form-builder>

Form control parameters

Name	Type	Required?	Description
controlType	string	Optional	Form control to be used
key	string	Optional	Key in the generated form Schema
label	string	Optional	Placeholder for form control
hintLabel	string	Optional	Placeholder for hint for input controls
value	any	Optional	Defines form submit button text
disabled	boolean	Optional	Decides if form control is Read Only
order	number	Optional	Order in which form controls should be rendered
validators	{ key: string; value: string }	Optional	Check Table below for possible keys and their values.
options	{ key: string; value: string }[]	Optional	Values for select, radio group controls.

Validators

Name	Type	Description
min	number	Validator that requires controls to have a value greater than a number.
max	number	Validator that requires controls to have a value less than a number.
pattern	string	Validator that requires a control to match a regex to its value.
email	boolean	Validator that performs email validation.
required	boolean	Validator that requires controls to have a non-empty value.
minLength	number	Validator that requires controls to have a value of a minimum length.
maxLength	number	Validator that requires controls to have a value of a maximum length.

Running the Sample

1. Clone the Git repository:

git clone https://github.com/AbigailFernandes/angular-form-builder.git
cd angular-form-builder

2. Install the dependencies:

npm install

3. Run the application:

npm start

Then navigate to http://localhost:4200/ in your browser and you should be able to see the form builder in action. You can play around with the form builder by modifying the form-builder-schema in app.service.ts.