@chatterton/angular2-schema-form/src/schema-form/model/arrayproperty.ts

Angular2 Schema Form (DISCLAIMER: it is not related to angular-schema-form)

import { FormProperty, PropertyGroup } from './formproperty';
import { FormPropertyFactory } from './formpropertyfactory';
import { SchemaValidatorFactory } from '../schemavalidatorfactory';
import { ValidatorRegistry } from './validatorregistry';

export class ArrayProperty extends PropertyGroup {

  constructor(
    private formPropertyFactory: FormPropertyFactory,
    schemaValidatorFactory: SchemaValidatorFactory,
    validatorRegistry: ValidatorRegistry,
    schema: any,
    parent: PropertyGroup,
    path: string
  ) {
    super(schemaValidatorFactory, validatorRegistry, schema, parent, path);
  }

  addItem(value: any = null): FormProperty {
    let newProperty = this.addProperty();
    newProperty.reset(value, false);
    return newProperty;
  }

  private addProperty() {
    let newProperty = this.formPropertyFactory.createProperty(this.schema.items, this);
    (<FormProperty[]>this.properties).push(newProperty);
    return newProperty;
  }

  removeItem(index: number) {
    (<FormProperty[]>this.properties).splice(index, 1);
    this.updateValueAndValidity(false, true);
  }

  setValue(value: any, onlySelf: boolean) {
    this.createProperties();
    this.resetProperties(value);
    this.updateValueAndValidity(onlySelf, true);
  }

  public _updateValue() {
    this.reduceValue();
  }

  private reduceValue(): void {
    let value = [];
    this.forEachChild((property, _) => {
      if (property.visible) {
        value.push(property.value);
      }
    });
    this._value = value;
  }

  reset(value: any, onlySelf = true) {
    value = value || this.schema.default || [];
    this.properties = [];
    this.resetProperties(value);
    this.updateValueAndValidity(onlySelf, true);
  }

  private createProperties() {
    this.properties = [];
  }


  private resetProperties(value: any) {
    for (let idx in value) {
      if (value.hasOwnProperty(idx)) {
        let property = this.addProperty();
        property.reset(value[idx], true);
      }
    }
  }

}