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I'd like to know if there's a way to pass a variable from javascript to apex by calling a js function that returns some var ? here's the example code the function that returns that var is called passThisValue(); 

public class myClass {
    public String myString {get; set;}

    public myClass(){
        myString = '';
    }

    public PageReference myMethod(){
        System.debug('myString: ' + myString);
        return null;
    }
}

VisualForce page: 

<script>
function setVar(param){
    jQuery('[id$=myHiddenField]').val(param);
    passStringToController();
}
</script>

<apex:inputHidden value="{!myString}" id="myHiddenField"/>

<apex:actionFunction name="passStringToController" action="{!myMethod}" rerender="myHiddenField"/>

<apex:commandButton value="Test me" onclick="setVar(passThisValue()); return false;" />

I've tried with setVar(passThisValue()); but setVar doesn't get what my function returns..

share|improve this question
    
you want to get myMethod return value in JS.? – Ratan Nov 25 '15 at 12:26
    
@Ratan no I want to get passThisValue() return value in apex – Joey Pablo Nov 25 '15 at 12:27
    
Pls add your passThisValue function – Ratan Nov 25 '15 at 12:29
up vote 1 down vote accepted 
<script>
function setVar(param){
    passStringToController(param);
}
</script>

<apex:inputHidden value="{!myString}" id="myHiddenField"/>

<apex:actionFunction name="passStringToController" action="{!myMethod}" rerender="myHiddenField">
    <apex:param name="strParam" value="" assignTo="{!myString}"/>
</apex:actionFunction>

<apex:commandButton value="Test me" onclick="setVar(passThisValue()); return false;" />

no need to assign the value to inputHidden. If you get the value in JS and pass in action function else 

<apex:actionFunction name="passStringToController" action="{!myMethod}" rerender="myHiddenField">
  <apex:param name="strParam" value="" assignTo="{!myString}"/>
</apex:actionFunction>

<apex:commandButton value="Test me" onclick="passStringToController(passThisValue()); return false;" />

Directly call action function and pass the value.

share|improve this answer
    
Thank you ! I don't know why I complicated it x) – Joey Pablo Nov 25 '15 at 12:54
    
No problem @JoeyPablo – Ratan Nov 25 '15 at 13:00

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