A link to a JavaScript library that can be used in the Visualforce page.
When specified, this component injects a script reference into the head element of the generated HTML page.
For performance reasons, you may simply want to use a JavaScript tag before your closing <apex:page> tag, rather than this component.
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The component that is used to include a JavaScript library in a Visualforce page is apex:includeScript. When this component is specified in the Visualforce page, it automatically injects a script reference into the head element of the generated HTML page. This allows the JavaScript library to be loaded and used within the page.
The apex:includeScript component takes two attributes:
value - The URL of the JavaScript library that you want to include in the Visualforce page.
loadOnReady - A Boolean value that indicates whether the JavaScript library should be loaded when the page is ready.
For performance reasons, it may be better to use a JavaScript tag before the closing apex:page tag instead of using the apex:includeScript component. This approach can be used if the JavaScript library is small and can be loaded quickly. However, if the library is large or if it is required for the page to function correctly, then the apex:includeScript component should be used.
Here is an example of using the apex:includeScript component:
php<apex:page> <apex:includeScript value="{!$Resource.jquery}" /> <script> // Your custom JavaScript code goes here </script> </apex:page> In this example, the apex:includeScript component is used to include the jQuery library, which is stored as a static resource in the Salesforce org. The jQuery library is loaded automatically when the page is rendered. The custom JavaScript code can then be added within the script tags, and it can use the jQuery library functions as needed.