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I would like to pass a parameter from my component to the controller. Here is the source code:

    <apex:actionFunction name="attachFil" action="{!attachFile}">
    <apex:param name="myImageURL" assignTo="{!pictureurl}" value=""/>
    </apex:actionFunction>

     <Script>attachFil('ok!!!');</script>

The controller have a field named pictureurl, and a function named attachFile. When I debug in the controller attachFile function, I find the pictureurl = null.

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You need to add a rerender param to the actionFunction. This is a quirk of actionFunctions and has been around a while.

the rerender param can be anything - eg rerender="nothing" or rerender="" and it should work.

Also, make sure your variable that you are passing is public and has a setter, eg public String pictureurl {get; set;}

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