Neste post, vamos dar continuidade a nossa primeira aplicação web com mapa.
Minha primeira aplicação web: Busca de Endereços
Desta vez, vamos aprender a como buscar um endereço e apresentá-lo no mapa. Eu sugiro você resgatar o código gerado na primeira parte desta série. Se você não conseguiu ler a primeira parte, você pode acessá-la aqui:
Meu conselho é que você guarde este código que vamos gerar, pois vamos utilizá-lo no terceiro e último post desta série, cujo tema será como codificar a funcionalidade para traçar direções de um ponto a outro.
Vamos lá?
A primeira coisa que você precisará é ter um editor de texto e criar um arquivo com o nome MyAppArcGISforDevelopers.html. Esta será a sua página HTML. Se você preferir realizar de forma mais dinâmica, sugiro que você acesse o CodePen e crie um novo Pen para editar o HTML.
Depois que seu arquivo estiver criado ou um novo Pen foi aberto, você poderá adicionar o seguinte código:
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Dentro da <head>, você poderá adicionar as referências para o CSS e para a API Javascript do ArcGIS.
<link rel="stylesheet" href="https://js.arcgis.com/4.13/esri/themes/light/main.css"> <script type="litespeed/javascript" data-src="https://js.arcgis.com/4.13/"></script>
Ainda dentro da <head>, adicione a tag <script> e a expressão require para carregar os módulos de mapa (Map), do visualizador de mapa (MapView) e o buscador (Search). Instancie um novo mapa (Map) e defina a propriedade de mapa base como street-navigation-vector. Instancie um visualizador de mapa (MapView) e defina as propriedades container, mapa, centro e zoom. E, também, instancie o buscador (Search), conforme o código abaixo:
<script type="litespeed/javascript">require(["esri/Map","esri/views/MapView","esri/widgets/Search"],function(Map,MapView,Search){var map=new Map({basemap:"streets-navigation-vector"});var view=new MapView({container:"viewDiv",map:map,center:[-43.2105,-22.9519],zoom:13});var search=new Search({view:view});view.ui.add(search,"top-right")})</script>
Parabéns!
Você acabou de incluir uma nova funcionalidade na sua aplicação. Agora você pode realizar a busca de endereços e apresentá-los no mapa.
Quer mais um desafio na sua primeira aplicação web?
Como desafio, você poderá realizar o passo abaixo, que é permitir realizar a busca de endereços a partir de uma coordenada X/Y.
Na função principal do seu Javascript, adicione o código abaixo:
view.on("click", function(evt){ search.clear(); view.popup.clear(); if (search.activeSource) { var geocoder = search.activeSource.locator; // World geocode service var params = { location: evt.mapPoint }; geocoder.locationToAddress(params) .then(function(response) { // Show the address found var address = response.address; showPopup(address, evt.mapPoint); }, function(err) { // Show no address found showPopup("Nenhum endereço encontrado.", evt.mapPoint); }); } });
Adicione também uma nova função, que é para apresentação do pop-up, conforme código abaixo:
function showPopup(address, pt) { view.popup.open({ title: "Coordenada: " + Math.round(pt.longitude * 100000)/100000 + ";" + Math.round(pt.latitude * 100000)/100000, content: address, location: pt }); }
Parabéns! Sua aplicação com busca de endereços por coordenada X/Y está pronta!
Caso tenha alguma dúvida, confira o código na íntegra:
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O que está achando de construir facilmente sua primeira aplicação web com mapa?
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Veja também:
Criando minha primeira aplicação web com mapa – parte 1
ArcGIS API for Python: os conceitos principais – parte 1
Motivos que farão você migrar seu desenvolvimento para o ArcGIS for Developers
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