学习要点:
1、dojo框架;
2、dojo框架下类的定义与继承;
3、dojo资源:
http:///api/
http:///download/
http:///documentation/tutorials/1.10/hello_dojo/
最近在研究arcgis js api,但好像不可避免要遇到dojo框架的学习与使用,因为arcgis js api就是基于dojo开发的。
思路:1、本地部署好arcgis js api(过程略);2、dojo简单实例代码;3、dojo类的定义与继续;
一、官网实例
实例1:
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <title>Tutorial: Hello Dojo!</title>
- </head>
- <body>
- <h1 id="greeting">Hello</h1>
- <!-- load Dojo -->
- <script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.4/dojo/dojo.js"
- data-dojo-config="async: true"></script>
- </body>
- </html>
这个实例中引用了dojo CDN官网api,试了下,并不好用,还是换成自己本地部署的api好使;
实例2
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <title>Tutorial: Hello Dojo!</title>
- </head>
- <body>
- <h1 id="greeting">Hello</h1>
- <!-- load Dojo -->
- <script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.4/dojo/dojo.js"
- data-dojo-config="async: true"></script>
-
- <script>
- require([
- 'dojo/dom',
- 'dojo/dom-construct'
- ], function (dom, domConstruct) {
- var greetingNode = dom.byId('greeting');
- domConstruct.place('<em> Dojo!</em>', greetingNode);
- });
- </script>
- </body>
- </html>
输出结果为:Hello Dojo!
实例3,类的定义与调用。定义一个js类,然后在html页面中调用

myModule.js
- define([
- // The dojo/dom module is required by this module, so it goes
- // in this list of dependencies.
- 'dojo/dom'
- ], function(dom){
- // Once all modules in the dependency list have loaded, this
- // function is called to define the demo/myModule module.
- //
- // The dojo/dom module is passed as the first argument to this
- // function; additional modules in the dependency list would be
- // passed in as subsequent arguments.
-
- var oldText = {};
-
- // This returned object becomes the defined value of this module
- return {
- setText: function (id, text) {
- var node = dom.byId(id);
- oldText[id] = node.innerHTML;
- node.innerHTML = text;
- },
-
- restoreText: function (id) {
- var node = dom.byId(id);
- node.innerHTML = oldText[id];
- delete oldText[id];
- }
- };
- });
hellodojo.html
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <title>Tutorial: Hello Dojo!</title>
- </head>
- <body>
- <h1 id="greeting">Hello</h1>
- <!-- configure Dojo -->
- <script>
- // Instead of using data-dojo-config, we're creating a dojoConfig
- // object *before* we load dojo.js; they're functionally identical,
- // it's just easier to read this approach with a larger configuration.
- var dojoConfig = {
- async: true,
- // This code registers the correct location of the "demo"
- // package so we can load Dojo from the CDN whilst still
- // being able to load local modules
- packages: [{
- name: "demo",
- location: location.pathname.replace(/\/[^/]*$/, '') + '/demo'
- }]
- };
- </script>
- <!-- load Dojo -->
- <script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.4/dojo/dojo.js"></script>
-
- <script>
- require([
- 'demo/myModule'
- ], function (myModule) {
- myModule.setText('greeting', 'Hello Dojo!');
-
- setTimeout(function () {
- myModule.restoreText('greeting');
- }, 3000);
- });
- </script>
- </body>
- </html>
在上面这个实例中,实现了js类的定义与调用,但在html页面中有个段代码需要注意,没有这段代码无法实现调用
- <script>
- // Instead of using data-dojo-config, we're creating a dojoConfig
- // object *before* we load dojo.js; they're functionally identical,
- // it's just easier to read this approach with a larger configuration.
- var dojoConfig = {
- async: true,
- // This code registers the correct location of the "demo"
- // package so we can load Dojo from the CDN whilst still
- // being able to load local modules
- packages: [{
- name: "demo",
- location: location.pathname.replace(/\/[^/]*$/, '') + '/demo'
- }]
- };
- </script>
二、类的定义与继承(http:///reference-guide/1.10/dojo/_base/declare.html)实例请参见官网

cacheMap.js
- /**
- * Created by neil on 2015/8/27.
- */
- define(["dojo/_base/declare",
- "esri/layers/ArcGISTiledMapServiceLayer",
- "esri/SpatialReference",
- "esri/geometry/Extent",
- "esri/layers/TileInfo"], function (declare, ArcGISTiledMapServiceLayer, SpatialReference, Extent, TileInfo) {
- return declare(ArcGISTiledMapServiceLayer, {
- constructor: function (baseUrl) {
- this.baseUrl=baseUrl;
- }
- });
- });
dojo5.html
- <!DOCTYPE html>
- <html>
- <head lang="en">
- <meta charset="UTF-8">
- <title>这是测试瓦片地图的一个类</title>
- <script>
- var dojoConfig = {
- async: true,
- packages: [{
- name: "demo",
- location: location.pathname.replace(/\/[^/]*$/, '') + '/demo'
- }]
- };
- </script>
- <script src="http://192.168.1.51/arcgis_js_api/library/3.14/3.14/init.js"></script>
- <script>
- require(["demo/cacheMap"], function (cacheMap) {
- var googleMapLayer = new cacheMap("baseUrl");
- greeting.innerHTML=googleMapLayer.baseUrl;
- });
- </script>
- </head>
- <body>
- <h1 id="greeting">Hello</h1>
- </body>
- </html>
未完
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