YouTipHTML DOM Script async Property
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HTML DOM Script character Property
Script async Property
Example
Check if the script is executed asynchronously (as soon as it is available):
var x = document.getElementById("myScript").asyncx output result:
trueDefinition and Usage
The async property sets or returns whether a script should be executed asynchronously (as soon as it is available).
This property reflects the async attribute of the <script> tag.
Note: The async property only applies to external scripts (only when the src attribute is used).
Note: There are several ways to execute an external script:
- If async="async": The script is executed asynchronously with respect to the rest of the page (the script will be executed as soon as it is available while the page continues parsing)
- If async is not used and defer="defer": The script will be executed when the page has finished parsing
- If neither async nor defer is used: The script is read and executed immediately, before the browser continues parsing the page
Browser Support
All major browsers support the async property.
Note: IE 9 and earlier versions, and Opera 12 and earlier versions do not support the async property.
Syntax
Return the async property:
scriptObject.async Set the async property:
scriptObject.async=true|falseProperty Values
| Value | Description |
|---|---|
| true|false | Specifies whether the script should be executed asynchronously (as soon as it is available). * true - The script is executed asynchronously (as soon as it is available). The script will be executed asynchronously as soon as it is available * false - The script is not executed asynchronously (as soon as it is available). |
Technical Details
| Return Value: | A Boolean. Returns true if the script is executed asynchronously (as soon as it is available), otherwise false. |
|---|
Related Articles
HTML Reference Manual: HTML <script> async Attribute