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I was roaming around the internet for this question.

I want to use include jquery first then mu custom js which uses jquery.

After the above steps, I want to call a function from my custom js which will take my json data's value returned by apex. ie. customeJSFunction(jsonValueArg)

Thanks.

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You can use loadOnReady attribute on apex:includeScript - meaning, that library will load only after DOM is constructed. For script you dont have such capability.

Also apex:includeScript docs:

Multiple references to the same script are de-duplicated, making this component safe to use inside an iteration component. This might occur if, for example, you use an inside a custom component, and then use that component inside an iteration.

Interesting read on script tag:

  • If async is present: The script is executed asynchronously with the rest of the page (the script will be executed while the page continues the parsing)
  • If async is not present and defer is present: The script is executed when the page has finished parsing
  • If neither async or defer is present: The script is fetched and executed immediately, before the browser continues parsing the page
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  • For the script tag, you can use the async or defer attribute. loadOnReady simply uses defer.
    – sfdcfox
    Jul 25, 2019 at 13:12
  • @sfdcfox Thanks sfdcfox!! Jul 25, 2019 at 13:15

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