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dragstart | ondragstart event

Fires on the source object when the user starts to drag a text selection or selected object.

Syntax

HTML Attribute <element ondragstart = "handler(event)">
Event Property object.ondragstart = handler;
addEventListener Method object.addEventListener("dragstart", handler, useCapture)

Event information

SynchronousNo
BubblesYes
CancelableYes

Event handler parameters

pEvtObj [in]

Type: IHTMLEventObj

Standards information

There are no standards that apply here.

Remarks

The ondragstart event is the first to fire when the user starts to drag the mouse. It is essential to every drag operation, yet is just one of several source events in the data transfer object model. Source events use the setData method of the dataTransfer object to provide information about data being transferred. Source events include ondragstart, ondrag, and ondragend.

When dragging anything other than an img object, some text to be dragged must be selected.

Calls the associated event handler.

To invoke this event, do one of the following:

  • Drag the selected text or object.

Examples

This example uses event bubbling to handle the ondragstart event at the body level.


<body ondragstart="console.log(event.srcElement.tagName)">
    <input type="text" value="Select and drag this text"> 
    <span>Select and drag this text</span> 
    <textarea>Select and drag this text</textarea>
</body>

This example shows when and where each event fires during a drag-and-drop operation by listing each event and the name of the object firing it in a list box.


<head>
<script type="text/javascript">
// Code for dynamically adding options to a select.
function ShowResults()
{				// Information about the events 
				 // and what object fired them.
  arg = event.type + "  fired by  " + event.srcElement.id;  
  var oNewOption = new Option(); 
  oNewOption.text = arg;
  oResults.add(oNewOption,0);
}
</script>
</head>
<body>
<p>Source events are wired up to this text box.</p>
<input id=txtDragOrigin value="Text to Drag"
    ondragstart="ShowResults()"
    ondrag="ShowResults()"
    ondragend="ShowResults()"
>
<p>Target events are bound to this text box.</p>
<input id=txtDragDestination value="Drag Destination"
    ondragenter="ShowResults()"
    ondragover="ShowResults()"
    ondragleave="ShowResults()"
    ondrop="ShowResults()"
>
<select id=oResults size=30>
  <option>List of Events Fired
</select>
</body>

See also

a
abbr
address
area
audio
b
bdo
blockQuote
body
canvas
caption
cite
code
custom
dd
del
dfn
div
dl
document
dt
em
fieldSet
form
hn
hr
i
img
input type=button
input type=checkbox
input type=email
input type=file
input type=image
input type=number
input type=password
input type=radio
input type=range
input type=reset
input type=search
input type=submit
input type=tel
input type=text
input type=url
kbd
label
li
map
menu
object
ol
p
pre
q
rt
ruby
s
samp
small
source
span
strong
sub
sup
table
tBody
td
textArea
tFoot
th
tHead
tr
u
ul
var
video
window
Reference
ondrop
Conceptual
About DHTML Data Transfer

 

 

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