V. ASP.NET Ajax Imperative Dropzones


 


To create dropzones using JavaScript instead of declarative script, just add the following JavaScript function to initialize your dropzone element with the custom dropzone behavior:


function addDropZoneBehavior(ctrl){

$create(Custom.UI.DropZoneBehavior, {}, null, null, ctrl);
}


To finish hooking everything up, call this addDropZoneBehavior function from the ASP.NET Ajax pageLoad() method, as you did in earlier examples for the addFloatingBehavior function.  This will attach the proper behaviors to their respective html elements and replicate the drag and dropzone functionality you created above using declarative markup.  If you want to make this work dynamically, just add the createDraggableDiv() function you already wrote for the previous dynamic example.  As a point of reference, here is the complete code for creating programmatic dropzones:



<%@ Page Language=”C#” %>
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml” >
<head id=”Head1″ runat=”server”>
<title>Imperative Drop Targets</title>
<script type=”text/javascript”>
    function addFloatingBehavior(ctrl, ctrlHandle){
        $create(Sys.Preview.UI.FloatingBehavior, {‘handle’: ctrlHandle}, null, null, ctrl);
    }
    function addDropZoneBehavior(ctrl){
        $create(Custom.UI.DropZoneBehavior, {}, null, null, ctrl);
    }
    function pageLoad(){
        addDropZoneBehavior($get(‘dropZone’));
        addFloatingBehavior($get(‘draggableDiv’),$get(‘handleBar’));
    }
</script>
</head>
<body>
<form id=”form1″ runat=”server”>
<asp:ScriptManager ID=”ScriptManager1″ runat=”server”>
    <Scripts>
            <asp:ScriptReference Name=”Microsoft.Web.Resources.ScriptLibrary.PreviewScript” />
        <asp:ScriptReference Name=”Microsoft.Web.Resources.ScriptLibrary.PreviewDragDrop” />
        <asp:ScriptReference Path=”scriptLibrary/DropZoneBehavior.js” />
    </Scripts>
</asp:ScriptManager>
<h2>Imperative Drop Targets with javacript</h2>
<div style=”background-color:Red;height:200px;width:200px;”>
    <div id=”draggableDiv” style=”height:100px;width:100px;background-color:Blue;”>
        <div id=”handleBar” style=”height:20px;width:auto;background-color:Green;”>
        </div>
    </div>
</div>
<div id=”dropZone” style=”background-color:cornflowerblue;height:200px;width:200px;”>Drop Zone</div>
</form>
</body>
</html>

 

Conclusion


Besides the dropzone behavior, you may want to also write your own floating behavior. For instance, by default, elements decorated with the floating behavior simply stay where you drop them. You may want to extend this so that your floating div will snap back to its original location when you drop it outside of a drop zone. Additionally, you may want to change the way the dragged element looks while you are dragging it, either by making it transparent, changing its color, or replacing the drag image altogether. All this can be accomplished by creating a behavior that implements the IDragSource interface in the same way you created a custom class that implements the IDropTarget interface.


This tutorial is for the most part a straight translation of the original Atlas tutorial that I wrote against the April CTP.  Even though many of the concepts behind Atlas are still retained in Ajax Extensions, some have changed by a turning of the screw so that what was once fitting and accurate in the original tutorial is no longer quite so.  For instance, whereas in the original Atlas tutorial I could talk about Xml Scripting and the rest of the ASP.NET Ajax functionality as one technology, they are now currently two varying technologies with different levels of support and interest for Microsoft.  There are more subtle differences that, I think, make the current version of the tutorial somewhat dated, as if I am saying everthing with a slight accent; in other words, while I stand by the accuracy of this tutorial, I think it has lost some of its original elegance in the translation.  I believe the tutorial will still be useful for those trying to get started with Microsoft’s Ajax implementation, though it’s chief utility, at this point, will probably be for people who were used to the Atlas way of doing things and need a point of reference to see how the semantics of the technology has changed. I hope the samples will help you over some of your growing pains, as writing it has helped me with mine.

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