Public and Private Methods in JavaScript

Public Members can be accessed anywhere using the "." notation.

 

Private Members can only be accessed within a constructor and public method.

 

Public methods and variables are declared using the "this" keyword like "this.variableName".

 

A Public method is accessed using a constructor; this technique is usually used to initialize public instance variables.

 

var objPublicPrivateClassg = new PublicPrivateClass();

 

Code

/*Comment
<CodeItem type="Method">Class Name</CodeItem>
<summary>Define the Class name as a function</summary>
<params>
</params>
<return></return>
Comment*/
function PublicPrivateClass() {
    //PublicMethods
    this.publicMethods = {
        /*Comment
        <CodeItem type="Method">InitializePageControlEvents</CodeItem>
        <summary>Initialize the control</summary>
        <params>
        </params>
        <return></return>
        Comment*/
        InitializePageControlEvents: function () {
            privateMethods.PrivateTestMethod();
        }
    };
    // Private Methods
    privateMethods = {
        /*Comment
        <CodeItem type="Method">PrivateTestMethod</CodeItem>
        <summary>Show the alert Message</summary>
        <params>
        </params>
        <return></return>
        Comment*/
        PrivateTestMethod: function () {
            alert("Calling Private Method.");
        },

        PrivateTestMethod2: function () {
            alert("PrivateTestMethod2");
        }
    };
}

HTML Code

 

Calling a Public Method:

<script type="text/javascript">
    function CallMethod() {
        try {
            var objPublicPrivateClassg = new PublicPrivateClass();
            //InitializePageControlEvents is Public method
            objPublicPrivateClassg.publicMethods.InitializePageControlEvents();
        }
        catch (err) {

            alert(err.message);
        }
    }
</script>

HTML Code

 

Calling a Public Method:

<script type="text/javascript">
    function CallMethod() {
        try {

            var objPublicPrivateClassg = new PublicPrivateClass();
            //InitializePageControlEvents is Public method
            objPublicPrivateClassg.publicMethods.InitializePageControlEvents();
        }
        catch (err) {
            alert(err.message);
        }
    }
</script>

Output

 

 

<script type="text/javascript">
    function CallMethod() {
        try {
            var objPublicPrivateClassg = new PublicPrivateClass();
            //InitializePageControlEvents is Private method
             objPublicPrivateClassg.privateMethods.PrivateTestMethod();
        }
        catch (err) {
            alert(err.message);
        }
    }
</script>

Output