Here is the code that i written:

<script> 
function myFunction(var num) 
{ 
 alert("Claim form has been successfully created with reference number:" + num); 
} 

<apex:commandButton action="{!submit}" value="Submit" oncomplete="myFunction({!Case.Claim_Reference__c});"/>

Attribution to: Vishwesh Prabhakar

Possible Suggestion/Solution #1

Add single quote when you call your field. Also if you set your Clain_Reference__c into your submit method, you will need to reRend your button or the section.

<apex:commandButton action="{!submit}" value="Submit" oncomplete="myFunction('{!Case.Claim_Reference__c}');"/>

Attribution to: Cloud Ninja
This content is remixed from stackoverflow or stackexchange. Please visit https://salesforce.stackexchange.com/questions/31478