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error | onerror event

Fires when an error occurs during object loading.

Syntax

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

Event information

SynchronousNo
BubblesNo
CancelableYes

Event handler parameters

pEvtObj [in]

Type: IHTMLEventObj

Standards information

There are no standards that apply here.

Remarks

Displays the browser error message when a problem occurs and executes any error handling routine associated with the event.

To invoke this event, do one of the following:

  • Run-time script error, such as an invalid object reference or security violation.
  • Error while downloading an object, such as an image.
  • An error occurs while fetching media data.

Examples

The following examples use the onerror event to handle run-time script errors and object load errors.

The following example specifies an invalid script entry. The script in the text field is evaluated when the Throw Error button is clicked. The onerror event fires because the script is invalid. The error results are inserted at the bottom of the sample page instead of in a dialog box.


<script>
window.onerror=fnErrorTrap;
function fnErrorTrap(sMsg,sUrl,sLine){
   oErrorLog.innerHTML="<b>An error was thrown and caught.</b><br />";
   oErrorLog.innerHTML+="Error: " + sMsg + "<br />";
   oErrorLog.innerHTML+="Line: " + sLine + "<br />";
   oErrorLog.innerHTML+="URL: " + sUrl + "<br />";
   return false;
}
function fnThrow(){
   eval(oErrorCode.value);
}
</script>
<input type="text" id="oErrorCode" value="someObject.someProperty=true;"/>
<input type="button" value="Throw Error" onclick="fnThrow()"/>
<br />
<div id="oErrorLog"></div>

The following example shows how to set the handler for the onerror event in script before an image source is specified. When the invalid source is set on the img element, the event fires.


<script>
var sImg='<img style="display: none;" id="oStub" alt="Default Text"/>';
function fnLoadFirst(){
   oContainer.innerHTML=sImg;
   oStub.onerror=fnLoadFail1;
   oStub.src="";
   oStub.style.display="block";
}
function fnLoadFail1(){
   oStub.alt="Image failed to load.";
   return true;
}
</script>
<input type="button" value="Load First Image" onclick="fnLoadFirst()"/>
<div id=oContainer></div>

See also

a
abbr
address
area
audio
b
base
bdo
bgSound
blockQuote
body
br
button
canvas
caption
cite
code
col
colGroup
comment
custom
dd
del
dfn
div
dl
document
dt
em
embed
fieldSet
form
frame
head
hn
hr
html
i
iframe
img
input type=button
input type=checkbox
input type=email
input type=file
input type=hidden
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
ins
kbd
label
legend
li
link
map
media
menu
meta
object
ol
optGroup
option
p
param
pre
q
rt
ruby
s
samp
script
select
small
source
span
strong
style
sub
sup
table
tBody
td
textArea
tFoot
th
tHead
title
tr
u
ul
var
video
window
onerrorupdate

 

 

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