HTML script Tag

  • HTML <script> tag is used to defines client-side JavaScript that is specifies within document or embedded external JavaScript file through the SRC attribute.

  • JavaScript executes on the user's local machine, when the document loads or some other time such as user click action, hover action etc.

  • JavaScript is not the same as Java Programming language.

  • Most common use of JavaScript to create interactive websites. It is mainly used for:

    • User-side validation.
    • Displaying modal windows and dialog boxes.
    • Dynamically manage the content, element style, or even structure.
    • Send/Receive data from server.
    • Implements slider, carousel, accordion.

Example

<!DOCTYPE html>
<html>
<head>
  <title>HTML script tag</title>
</head>
<body>
  <script>
    document.write("Hello World!");
  </script>
</body>
</html>

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Example (Embedded external JavaScript file)

script_tag_external.js
function hello(){  
  alert("Hello World!");  
}

script_tag_external.html
<!DOCTYPE html>
<html>
<head>
  <title>HTML script tag</title>
  <script src="script_tag_external.js"></script>
</head>
<body>
  <input type="button" value="Click" onclick="hello()"/> 
</body>
</html>

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<script> Tag Attributes

HTML <script> tag support following specific attributes.

Attributes Value Description
async async Specifies that script will executed asynchronously as soon as it's loads.
Note: This attribute must be used only for external embedded file.
charset charset Specifies the character encoding of external JavaScript file.
defer defer Indicates that script will be executed, once page is loads completely.
Note: This attribute must be used only for external embedded file.
src URL Specifies the URL of an external JavaScript file.
type MIME_type Specifies the valid MIME type of the scripting languages.

Global Attributes

HTML <script> tag support following global attributes.

Attributes Value Description
id unique_name Declared unique id for an element.
class class_name Declared one or more classnames for an element.
style styles CSS inline styles specify an element.
title title Specify extra details of element contain, this will display as a "tooltip" for an elements.

Event Attributes

HTML <script> tag support following event attributes.

Attributes Value Description
onfocus script element gets focus on object when script tobe run.
onblur script element lose the focus on object when scrip tobe run.
onabort script element gets aborted on object when script tobe run.
onchange script element gets anytime change on object when script tobe run.
onbeforeunload script element gets unloaded on object when scrip tobe run.
onclick script clicked on object when script tobe run.
ondblclick script double click on object when script tobe run.
onkeydown script key is pressed when script tobe run.
onkeypress script key is pressed over element then released when script tobe run.
onkeyup script key is released over element when script tobe run.
onmousedown script mouse button was pressed over an element when script tobe run.
onmouseout script mouse pointer release over an element when script tobe run.
onmousemove script run mouse pointer moved when script tobe run.
onmouseover script run mouse pointer move over when script tobe run.
onmouseup script mouse button is released when script tobe run.
onreset script form has been reset when script tobe run.
onselect script Select some content when script tobe run.
onsubmit script form has been submitted when script tobe run.
onload script object has load when script tobe run.
onchange script allow to change the object when script tobe run.
onunload script unload to the browser window when script tobe run.
ondrag script element being dragged when script tobe run.
ondragend script element being stop dragged when script tobe run.
ondragenter script element being go target dragged when script tobe run.
ondragleave script element being leave to target dragged when script tobe run.
ondragover script element being over to target dragged when script tobe run.
ondragstart script element being start dragged when script tobe run.
ondrop script element being dropped when script tobe run.
onerror script element error occurs when script tobe run.
onmessage script element message display when script tobe run.
onerror script element error occurs when script tobe run.
onmousewheel script mouse wheel will be rotate when script tobe run.
onscroll script scrollbar is scroll when script tobe run.
onresize script element should be resize when script tobe run.
onselect script all element content selected when script tobe run.
onstorage script element should be store in target when script tobe run.

Browser Compatibility

  • Google Chrome
    Yes
  • Mozilla Firefox
    Yes
  • Microsoft Edge
    Yes
  • Opera
    Yes
  • Safari
    Yes