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Coding differences between API 1.6 and 3.6

JoseSanchez

Hi all

In API 1.6 the javascript source code started with:

<script type="text/javascript">
      dojo.require("esri.map");

      var myMap, myTiledMapServiceLayer;
      function init() {

Now in version 3.6 I see that the same code stars in a different way, with a require that covers the whole script. Why?

I find the 1.6 way easier to read.

<script src="http://js.arcgis.com/3.6/"></script>
    <script>
      var map;
      require([
        "esri/map", "esri/layers/FeatureLayer", 
        "esri/tasks/query", "esri/tasks/QueryTask", 
        "esri/tasks/GeometryService", "esri/tasks/BufferParameters",
        "esri/graphic", "esri/InfoTemplate", "esri/symbols/SimpleMarkerSymbol",
        "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol", 
        "esri/config", "dojo/_base/Color", "dojo/dom", "dojo/domReady"
      ], function(

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Accepted answers

All comments

zhongrenGu

in browser, if we use dojo, wo can go faster,AMD:just like we can do more things..thanks

JoseSanchez

Thank you all!!

JonathanUihlein

Hi jsn,

This link should help explain the whys and hows of using AMD.

http://dojotoolkit.org/blog/learn-more-about-amd

*edit

I noticed you were looking for older samples in another thread and felt my response should have probably been posted in this thread.

Hey jsn,

It's a great time to start learning and using AMD syntax because DOJO 2.0 will soon be released and the legacy syntax will no longer be supported in newer versions of the API.

I think AMD style ends up making the code much more clean and readable from a programmer's perspective (not to mention, faster apps!)

I noticed that you are using version 1.6 of the JSAPI, from the other thread. That version was released in February 2010. Since then, many improvements and features have been added. You should check them out! They are fantastic.

kenbuja

You should also take a look at this tutorial to get a better understanding of the new coding concepts.

While some of the changes are fundamental and at first glance might be confusing, they are all there for good reasons to make your code be more efficient, run faster, better leverage JavaScript and make your code more maintainable.

AndyBurns

ESRI is moving the core dojo towards AMD following dojo's move towards it earlier.

https://developers.arcgis.com/en/javascript/jshelp/inside_dojo_amd.html

Legacy syntax is still supported with dojo but its best to get onboard with AMD as it will be the future.

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