Pass an Array variable between javascript and apex

Question

I have a little problem but I'm not able to find a solution.I'm trying to pass an array variable "d" from javascript to List variable "values" in the apex controller. Here my code:

javascript:

 function setVal(param){
    param =param.replace("[","");
    param =param.replace("]","");
    var mylist = new Array()
    mylist = param.split(',');
    alert(mylist);
    var d =new Array();
    for( var i = 0; i < mylist.length; i++ ){
    var appoggio = mylist[i].trim();
    var strAppoggio = document.getElementById( appoggio ).innerHTML;
    strAppoggio = strAppoggio.substring(strAppoggio.lastIndexOf("*") + 1, strAppoggio.lastIndexOf("+"));
    d.push(strAppoggio);              
   }
   afConMethod(d.join());  
   alert('dToString: ' + dToString);           
   }    

visualforce:

<apex:commandButton value="Get" onclick="setVal('{!firstrow}');" reRender="output"/>
<apex:actionFunction name="afConMethod" action="{!MyConMethod}" >
<apex:param value="" name="theValue" assignTo="{!theValue}" />

apex controller:

   public String  theValue {get;set;}
    public List<String> values {get;set;}
    //controller
    public ApexPages.StandardController stdController;
    public excelPageController(ApexPages.StandardController stdcontroller) {
    //this.stdController = stdController;
        oppId =ApexPages.currentPage().getParameters().get('ID');//Current opportunity ID;
    }
     system.debug('Start');
        //theValue=Apexpages.currentPage().getParameters().get('theValue');      
        system.debug('Passed in theValue: '+ theValue);
        values = convertStrToList(theValue);
        system.debug('Passed in value2: '+ values);

    }

    public String[] convertStrToList(String str) {
    String[] listToReturn = new List<String>();
    if(String.isNotBlank(str)) {
        for(String eachStr : str.split(',')) {
            listToReturn.add(eachStr);
        }
    }
    return listToReturn;
    }

The debug logs shows the message: Passed in value: null

I really don't understand what's going wrong.

Answer 1

Use this code in myMethod() to capture the value that is being passed from actionFunction.

public void MyConMethod() {
theValue=Apexpages.currentPage().getParameters().get('theValue');
System.debug('Passed in value: '+theValue);
values = convertStrToList(theValue);
}