The Road to Dojo: How to use Dojo to achieve Drag and Drop effects_dojo

Nowadays, various sites using AJAX technology have implemented Drag and Drop (drag) effects, which can also be easily achieved using the Dojo framework. Compared with other frameworks, the code is less and the browser compatibility support is better.

Let’s take a look at the effect first. The following is the effect of the homepage of the 51AJAX.com site. Each module can be dragged arbitrarily:


How to implement it? The following are the specific steps. For simplicity, I made a Drag and Drop Demo page:

　
　The following are the specific steps:
　1 .html part
To implement dragging, you must first have a container, and secondly, you must have draggable elements. Here we set up three Divs as containers, with IDs container1, container2, and container3. Each container places a Div as a draggable element, and their class is divdrag.
　2.javascript code
First add a reference to dojo.js in the head, then obtain the elements with class divdrag, register them as dojo.dnd.HtmlDragSource objects, and then register container1, container2, and container3 For three containers, and specify the container to which the draggable elements in the container can be dragged, the above event is encapsulated into a function and added to the window.onload event.

To download the complete Dojo framework, please click here to download: http://download.dojotoolkit.org/release-0.3.1/dojo-0.3.1-ajax.zip.

Copy code The code is as follows:

//Quote the following two dojo packages
dojo .require("dojo.style");
dojo.require("dojo.dnd.*");

function init(){
//Use classname to get the element list, and It is registered as dojo.dnd.HtmlDragSour
var arr=dojo.html.getElementsByClass('divdrag')
for(var i=0;i var parentDiv=arr [i].parentNode.id
new dojo.dnd.HtmlDragSource(arr[i],parentDiv);
}
//Define container
new dojo.dnd.HtmlDropTarget("container1", ["container1","container2","container3"]); 
 new dojo.dnd.HtmlDropTarget("container2", ["container1","container2","container3"]); 
 new dojo. dnd.HtmlDropTarget("container3", ["container1","container2","container3"]);    
}

//Add to window.onload event
window.onload=function (){init();}