page-information.ts
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	import { OnInit } from '@angular/core';
	import { TlnQueryServiceInterface, ManuscriptUnity, NavigationPage} from '../models';
	import { DataHandler } from '../data_handler';
	import { TlnTextGeneticOrder} from '../datatypes/text_version';
	import { TLN_PAGE_PARAM } from '../constants';
	import { TlnPositionalStyleMarkup, TlnFilteredPositionalStyleMarkup } from '../datatypes/positional-markup';

	export class PageInformation implements OnInit {
	/**
	* the data handler of this component that retrieves
	* data and instantiates it according to their proper
	* datatypes.
	**/
	dataHandler: DataHandler = new DataHandler(this);
	geneticOrders: TlnTextGeneticOrder[] = [];

	constructor(private queryService: TlnQueryServiceInterface, public current_page: NavigationPage){ }

	ngOnInit() {
	this.dataHandler.addHandler('geneticOrders', { 'handler': TlnTextGeneticOrder});
	this.dataHandler.setQueryService(this.queryService);
	this.dataHandler.getData('geneticOrders', <string>this.current_page.id)
	}
	public hasInformation(): boolean {
	return this.geneticOrders.length > 0;
	}
	}