clearData Method

Removes one or more data formats from the clipboard through datatransfer or clipboarddata object.

dhtml语法

pret = object.cleardata( [sdataformat])

parameters

sDataFormat Optional. Stringthat specifies one or more of the following data format values:
Text Removes the text format.
URL Removes the URL format.
File Removes the file format.
HTML Removes the HTML format.
Image Removes the image format.

Return Value

No return value.

Remarks

If no sDataFormat parameter is passed, the data formats are cleared.
For drag-and-drop operations, the clearData method of the dataTransfer object is generally used in source events, such as ondragstart. when overriding the default behavior of the target, use cleardata in the ondrop event. it is particularly useful for selectively removing data formats when multiple formats are specified.

DHTML代码范例

This example uses the clearData method to remove the Text data format from the clipboard through the dataTransfer object.

<HEAD>
<STYLE>
DIV {background-color:magenta; width: 300;}
SPAN {color:lightgreen;}
</STYLE>
<SCRIPT>
function Source_DragStart(){
event.dataTransfer.setData("Text", "This text will be cleared");
}
function Target_Enter(){
window.event.returnValue = false;
event.dataTransfer.clearData("Text");
oTarget.innerText = event.dataTransfer.getData("Text");
}
</SCRIPT>
</HEAD>
<BODY>
<P>Drag the green text and drop it over the magenta DIV.</P>
<SPAN ID="oSource" ondragstart="Source_DragStart()">
Drag this text.
</SPAN>
<P>Drop the text below. The word "null" will appear in the DIV.</P>
<DIV
ID="oTarget" ondragenter="Target_Enter()">
</DIV>
</BODY>

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是否符合公共标准

There is no public standard that applies to this method.

Applies To

clipboardData, dataTransfer

更多语法参考

about dhtml data transfer, getdata, setData