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:
<!DOCTYPE html> <html> <head> <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> <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");view.on("click",function(evt){search.clear();view.popup.clear();if(search.activeSource){var geocoder=search.activeSource.locator;var params={location:evt.mapPoint};geocoder.locationToAddress(params).then(function(response){var address=response.address;showPopup(address,evt.mapPoint)},function(err){showPopup("Nenhum endereço encontrado.",evt.mapPoint)})}});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})}})</script> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"> <title>ArcGIS JavaScript Tutorials: Create a JavaScript starter app</title><style>html, body, #viewDiv { padding: 0; margin: 0; height: 100%; width: 100%; }</style></head> <body> <div id="viewDiv"></div> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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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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