JavaScript Events

Events are actions or occurrences that happen to HTML elements.

JavaScript can act when an HTML Event occurs.

Events can represent everything from basic user interactions to automated notifications of things happening in the rendering model.

HTML Events

An HTML event can fires because of user action or browser action.

Here are some examples of HTML events:

  • An HTML web page was finished loading
  • An HTML web page was resized or closed
  • An HTML element was clicked by the user
  • An HTML input field was changed
  • An HTML form was submitted
  • An error occured

You can do something when an event occurs.
It is possible to execute JavaScript code when events are detected.

HTML elements have event handler attributes. It is possible to add JavaScript code to the attributes.

JS JavaScript - HTML Events

// The event handler attribute can have inline JavaScript code
<button onclick="alert('The full date: ' + Date())">Press me to get the time</button>
// The event handler attribute can call a JavaScript method 
<button onclick="displayFullDate()">Press me to get the time</button>

Using HTML Web Events

There are a number of different ways in which you can add event listener code to web pages.

Here are several lists of common HTML events.


HTML Mouse Events

JS JavaScript - HTML Mouse Events

Event Description Example
onclick The mouse is moved onto the element <button onclick="myClickFunction()"> Click me</button>
onmousedblclick The mouse has been pressed and released on an element  
onmouseover The mouse is moved onto the element <img onmouseover="showBigImg(this)"  src="ocean.png" alt="Ocean"> 
onmousemove The mouse is moved over an element  <div onmousemove="myActionFunction()"> Move the cursor over me</div>
onmousedown The mouse button is pressed on an element  <p onmousedown="myReactFunction()"> Click the text!</p>
onmouseup The mouse is released over an element  
onmouseenter The mouse is moved onto the element  
onmouseleave The mouse is moved off the element   
onmouseout The mouse is moved off the element  
onwheel The mouse wheel button is rotated in any direction  
onselect Some of the text has been selected <input type="text"  onselect="mySelectFunction()">
pointerlockchange The pointer was locked or released  
pointerlockerror It is impossible to lock the pointer for technical reasons or permission is denied
auxclick The middle mouse button was pressed. It is indicating that a non-primary button has been pressed

HTML Keyboard Events

JS JavaScript - HTML Keyboard Events

Event Description Example
onkeydown Event when user is pressing a key <input type="text" onkeydown="myKeyDownFunction()">
onkeypress Event when a user presses a key <input type="text" onkeypress="myKeyPressFunction()">
onkeyup Event when a user releases a key <input type="text" onkeyup="myKeyUpFunction()">

HTML Form Events

JS JavaScript - HTML Form Events

Event Description Example
onreset Event when a form is reset <form onreset="myFormResetFunction()">
  Enter username: <input type="text">
  <input type="reset">
onsubmit Event when a form is submitted <form onsubmit="myFormSubmitFunction()">
  Enter username: <input type="text">
  <input type="submit">

HTML Progress Events

JS JavaScript - HTML Progress Events

Event Description Example
onloadstart Event when the video is starting/looking for the video  <video onloadstart="myStartFunction()">
ondurationchange  Event when the duration of the audio/video is changed <video ondurationchange="myDurationFunction()">
onloadedmetadata  Event when meta data for audio/video has loaded <video onloadedmetadata="myMetaFunction()">
onloadeddata  Event when data for the current frame is loaded, but not enough to play next frame <video onloadeddata="myLoadedFunction()">
onprogress Event when the video is downloading <video onprogress="myProgressFunction()">
oncanplay Event when a video is ready to start playing (has buffered enough) <video oncanplay="myPlayFunction()">
oncanplaythrough Event when a video can be played all the way without any stop <video oncanplaythrough="myCanPlayFunction()">

HTML Focus Events

The onfocus event is the opposite of the onblur event.

JS JavaScript - HTML Focus Events

Event Description Example
onfocus Event when an element gets focus. Most used on element <input>, <select>, and <a> <input type="text" onfocus="myFocusFunction()">
onblur Event when user leaves an input field <input type="text" onblur="myBlurFunction()">

HTML Network Events

The ononline event is the opposite of the offline event.

Also use the navigator.onLine property to find out whether the browser is in online or offline mode (alert('Return true if browser is online, false if offline: ' + navigator.onLine);)

JS JavaScript - HTML Network Events

Event Description Example
ononline Event when the browser starts to work online <body ononline="myOnlineFunction()">
onoffline Event when the browser lost online contact <body onoffline="myOfflineFunction()">


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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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