My <apex:actionFunction> keeps reloading the VF page even though it does have a reRender attribute and the controller method returns null. Below are part of my code:


<apex:pageMessages id="page_message" />
<apex:actionFunction name="testConnection"  action="{!testConnection}" reRender="page_message" onComplete="displayConnectionInfo();" />

onComplete function:

function displayConnectionInfo() {
    return false;

Controller method:

public pageReference testConnection() 
    ApexPages.Message connection_info = Util.testConnection();

    return null;

My another page has a similar button and actionfunction and does work very well without reloading the page. There must be something I missed here but I am not sure what is it.

  • two question from where you are calling this actionfunction and overridePageMessages(); what this function do? Commented Dec 12, 2016 at 5:17
  • @TusharSharma testConnection basically test connection between Salesforce and our system. overridePageMessages() simply converts <apex:pageMessages> into lds style. I assure you there is no page loading code in Javascript. I have double checked.
    – Lance Shi
    Commented Dec 12, 2016 at 5:20
  • Can you just comment overridePageMessages(); and try.
    – Reshma
    Commented Dec 12, 2016 at 5:22
  • @Reshma Just tried. Still refresh. It doesn't even go into the onComplete method when I debug
    – Lance Shi
    Commented Dec 12, 2016 at 5:24
  • 2
    @LanceShi - How are you executing the actionFunction? via script, button, link?
    – Eric
    Commented Dec 12, 2016 at 23:50

1 Answer 1


if you are using commandButton and using Onclick function so please make sure to use "return false" inside Onclick function.

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