Hello Everyone, In this tutorial, I am going to explain how to pass parameter in apex function or Apex method with help of javascript. In this example, I am showing account record list and provide a search functionality finds account according to the name that is input by the user in the search box. This search functionality uses apex:action function to pass the value in apex method using javascript.

After completing this tutorial, you’ll able to:
  • Pass parameter in Apex function/method using javascript.
So let's start,

Passing parameter in the Apex method using Java-Script

Step 1: Open Developer Console, Go to File>New>Apex Class and create an Apex controller called AccountHandler. Replace the following code.
 public class AccountHandler {
    public List<Account> lstAcc{get;set;}
    public AccountHandler(){
        getAccoutList();
    }
    public void getAccoutList(){
        String AccountName = ApexPages.currentPage().getParameters().get('AccountName');
        String sQuery='SELECT Id, Name, Industry FROM Account';
        if(AccountName !=null && AccountName!=''){
            sQuery+=' WHERE Name LIKE \'%' + AccountName + '%\'';
        }
        System.debug(sQuery);
        lstAcc=Database.query(sQuery);
    }
 }
Step 2: Open Developer Console, Go to File>New>Visualforce Page and create a new Visualforce Page called FindAccount and replace the following markup.   
  <apex:page controller="AccountHandler" showHeader="false" sidebar="false">    
    <apex:form id="thfrm">
        <br/><br/>
        <center>
            <p style="font-size:20px;">
                <u>Passing Parameter using Java Script</u>
            </p>        
            Account Name :<input type='text' id='txtAccount' value=''/> 
            <input type="button" id="btnSearch" value='Search' onclick="getAccountList();"/><br/><br/>
        </center>
        <apex:actionFunction name="FindAccount" action="{!getAccoutList}" reRender="pbtbl">
            <apex:param value="" name="AccountName"/>
        </apex:actionFunction>
        <apex:pageBlock id="pbtbl">
            <apex:pageBlockTable value="{!lstAcc}" var="a">
                <apex:column value="{!a.id}"/>
                <apex:column value="{!a.Name}"/>
                <apex:column value="{!a.Industry}"/>
            </apex:pageBlockTable>
        </apex:pageBlock>
        <script>
        
        function getAccountList(){
            var searchString=document.getElementById('txtAccount').value;
            if(searchString!=null && searchString!='' && searchString!=undefined){
                FindAccount(searchString);
            }
            else{
                FindAccount('');
            }
        }
        </script>
    </apex:form>
 </apex:page>

 Output:

See also:

Conclusion:
Hope you like this tutorial, for any query or suggestions please feel free to comment.
Thank you.