HTML copy and paste in AIR

Adobe AIR 1.0 and later

The HTML environment in Adobe AIR provides its own set of events and default behavior for copy and paste. Only code running in the application sandbox can access the system clipboard directly through the AIR Clipboard.generalClipboard object. JavaScript code in a non-application sandbox can access the clipboard through the event object dispatched in response to one of the copy or paste events dispatched by an element in an HTML document.

Copy and paste events include: copy , cut , and paste . The object dispatched for these events provides access to the clipboard through the clipboardData property.

Default behavior

By default, AIR copies selected items in response to the copy command, which can be generated either by a keyboard shortcut or a context menu. Within editable regions, AIR cuts text in response to the cut command or pastes text to the cursor or selection in response to the paste command.

To prevent the default behavior, your event handler can call the preventDefault() method of the dispatched event object.

Using the clipboardData property of the event object

The clipboardData property of the event object dispatched as a result of one of the copy or paste events allows you to read and write clipboard data.

To write to the clipboard when handling a copy or cut event, use the setData() method of the clipboardData object, passing in the data to copy and the MIME type: 

function customCopy(event){ 
    event.clipboardData.setData("text/plain", "A copied string."); 
}

To access the data that is being pasted, you can use the getData() method of the clipboardData object, passing in the MIME type of the data format. The available formats are reported by the types property. 

function customPaste(event){ 
    var pastedData = event.clipboardData("text/plain"); 
}

The getData() method and the types property can only be accessed in the event object dispatched by the paste event.

The following example illustrates how to override the default copy and paste behavior in an HTML page. The copy event handler italicizes the copied text and copies it to the clipboard as HTML text. The cut event handler copies the selected data to the clipboard and removes it from the document. The paste handler inserts the clipboard contents as HTML and styles the insertion as bold text. 

<html> 
<head> 
    <title>Copy and Paste</title>             
    <script language="javascript" type="text/javascript"> 
        function onCopy(event){ 
            var selection = window.getSelection(); 
            event.clipboardData.setData("text/html","<i>" + selection + "</i>"); 
            event.preventDefault(); 
        } 
 
        function onCut(event){ 
             var selection = window.getSelection(); 
             event.clipboardData.setData("text/html","<i>" + selection + "</i>"); 
             var range = selection.getRangeAt(0); 
             range.extractContents(); 
             
            event.preventDefault(); 
        } 
 
        function onPaste(event){ 
            var insertion = document.createElement("b"); 
            insertion.innerHTML = event.clipboardData.getData("text/html"); 
             var selection = window.getSelection(); 
             var range = selection.getRangeAt(0); 
             range.insertNode(insertion); 
            event.preventDefault(); 
        } 
    </script> 
</head> 
<body onCopy="onCopy(event)" 
     onPaste="onPaste(event)" 
     onCut="onCut(event)"> 
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</body> 
</html>

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