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alignContent alignItems alignSelf animation animationDelay animationDirection animationDuration animationFillMode animationIterationCount animationName animationTimingFunction animationPlayState background backgroundAttachment backgroundColor backgroundImage backgroundPosition backgroundRepeat backgroundClip backgroundOrigin backgroundSize backfaceVisibility border borderBottom borderBottomColor borderBottomLeftRadius borderBottomRightRadius borderBottomStyle borderBottomWidth borderCollapse borderColor borderImage borderImageOutset borderImageRepeat borderImageSlice borderImageSource borderImageWidth borderLeft borderLeftColor borderLeftStyle borderLeftWidth borderRadius borderRight borderRightColor borderRightStyle borderRightWidth borderSpacing borderStyle borderTop borderTopColor borderTopLeftRadius borderTopRightRadius borderTopStyle borderTopWidth borderWidth bottom boxShadow boxSizing captionSide clear clip color columnCount columnFill columnGap columnRule columnRuleColor columnRuleStyle columnRuleWidth columns columnSpan columnWidth counterIncrement counterReset cursor direction display emptyCells filter flex flexBasis flexDirection flexFlow flexGrow flexShrink flexWrap cssFloat font fontFamily fontSize fontStyle fontVariant fontWeight fontSizeAdjust height isolation justifyContent left letterSpacing lineHeight listStyle listStyleImage listStylePosition listStyleType margin marginBottom marginLeft marginRight marginTop maxHeight maxWidth minHeight minWidth objectFit objectPosition opacity order orphans outline outlineColor outlineOffset outlineStyle outlineWidth overflow overflowX overflowY padding paddingBottom paddingLeft paddingRight paddingTop pageBreakAfter pageBreakBefore pageBreakInside perspective perspectiveOrigin position quotes resize right tableLayout tabSize textAlign textAlignLast textDecoration textDecorationColor textDecorationLine textDecorationStyle textIndent textOverflow textShadow textTransform top transform transformOrigin transformStyle transition transitionProperty transitionDuration transitionTimingFunction transitionDelay unicodeBidi userSelect verticalAlign visibility width wordBreak wordSpacing wordWrap widows zIndex
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Other References

CSSStyleDeclaration JS Conversion


onerror Event

❮ Event Object

Example

Do something if a problem occurs with the event stream:

var source = new EventSource("demo_sse.php");
source.onerror = function() {
  // Do something to handle error
};


Definition and Usage

The onerror event occurs when an error occurs with the event source.

An error usually occurs when a connection is disrupted. If this happens, the EventSource object will automatically attempt to reconnect to the server.

Related events:

  • onmessage - Occurs when a message is received
  • onopen - Occurs when a connection to the server is open

For more information about Server-Sent Events, read our HTML5 Server-Sent Events Tutorial.


Browser Support

The numbers in the table specify the first browser version that fully supports the event.

Event
onerror 9.0 Not supported 6.0 5.0 11.0

Syntax

object.onerror = function(){myScript};

Using the addEventListener() method:

object.addEventListener("error", myScript);

Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.


Technical Details

Bubbles: No
Cancelable: No
Event type: Event

❮ Event Object