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ArcGIS API for JavaScript 4.2学习笔记[12] View的弹窗（Popup）

2017-02-15 11:39 471 查看

看本文前最好对第二章（Mapping and Views）中的Map和View类有理解。

视图类有一个属性是Popup类型的popup，查阅API知道这个就是视图的弹窗，每一个View的实例都有一个popup。

这个popup属性在View对象实例化的时候就实例化了的，即随着View的出生，它也会出生，它拥有默认的样子，它显示的文字也是默认的样式。

我们看看Popup这个类：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Get started with popups - 4.2</title>

<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}

#instruction {
z-index: 99;
position: absolute;
top: 15px;
left: 50%;
padding: 5px;
margin-left: -175px;
height: 20px;
width: 350px;
background: rgba(25, 25, 25, 0.8);
color: white;
}
</style>

<link rel="stylesheet" href="https://js.arcgis.com/4.2/esri/css/main.css">
<script src="https://js.arcgis.com/4.2/"></script>

<script>
require([
"esri/tasks/Locator",
"esri/Map",
"esri/views/MapView",
"dojo/domReady!"
], function(
Locator,
Map,
MapView
) {

// Set up a locator task using the world geocoding service
var locatorTask = new Locator({
url: "https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer"
});

// Create the Map
var map = new Map({
basemap: "streets-navigation-vector"
});

// Create the MapView
var view = new MapView({
container: "viewDiv",
map: map,
center: [-116.3031, 43.6088],
zoom: 12
});

/*******************************************************************
* This click event sets generic content on the popup not tied to
* a layer, graphic, or popupTemplate. The location of the point is
* used as input to a reverse geocode method and the resulting
* address is printed to the popup content.
*******************************************************************/
view.on("click", function(event) {
// Get the coordinates of the click on the view
var lat = Math.round(event.mapPoint.latitude * 1000) / 1000;
var lon = Math.round(event.mapPoint.longitude * 1000) / 1000;

view.popup.open({
// Set the popup's title to the coordinates of the location
title: "Reverse geocode: [" + lon + ", " + lat + "]",
location: event.mapPoint // Set the location of the popup to the clicked location
});

// Display the popup
// Execute a reverse geocode using the clicked location
locatorTask.locationToAddress(event.mapPoint).then(function(
response) {
// If an address is successfully found, print it to the popup's content
var address = response.address.Match_addr;
view.popup.content = address;
}).otherwise(function(err) {
// If the promise fails and no result is found, print a generic message
// to the popup's content
view.popup.content =
"No address was found for this location";
});
});
});
</script>
</head>

<body>
<div id="viewDiv"></div>
<div id="instruction">Click any location on the map to see its street address</div>
</body>

</html>

源代码

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