Invoke a JavaScript function from a dynamically inserted nested function

Question

Invoke a JavaScript function from a dynamically inserted nested function

My primary application loads JavaScript files based on the page being visited:

var MainApp = (function() {
    function loadPage(folder, template) {
        $.getScript('scripts/' + template + '.js')
            .done(function() {
                console.log(template + " script loaded.");
            });
    }
    function executeFunction() {
        // do something ...
    }
})();

The JavaScript code being loaded in $.getScript() is structured like this:

var Utilities = (function() {
    // try to call executeFunction()
})();

I am wondering how I can call MainApp.executeFunction() from within Utilities().

When I attempt to use MainApp.executeFunction(), it shows that MainApp is undefined. And when I try just executeFunction(), the function appears to be undefined as well.

javascript function

Answer 1

Answer №1

When you assign a value to AdminConsole, it's actually the value returned by an anonymous function. If nothing is returned, then the value is undefined.

To make public methods and properties accessible, you should export them like this:

var AdminConsole = (function() {
    // ... (private data)
    return { // Export public data
        test: test,
        openPage: openPage
    };
})();

If private data is not needed, you can opt for a simpler approach:

var AdminConsole = {
    test: function(){ /*...*/ },
    openPage: function(){ /*...*/ }
};

Answer 2

When you assign a value to AdminConsole, it's actually the value returned by an anonymous function. If nothing is returned, then the value is undefined.

To make public methods and properties accessible, you should export them like this:

var AdminConsole = (function() {
    // ... (private data)
    return { // Export public data
        test: test,
        openPage: openPage
    };
})();

If private data is not needed, you can opt for a simpler approach:

var AdminConsole = {
    test: function(){ /*...*/ },
    openPage: function(){ /*...*/ }
};

Answer 3

Answer №2

It seems like AdminConsole is being generated by a function call. In case this function does not include a return statement, then AdminConsole will end up being undefined. Maybe what you are looking for is:

AdminConsole = {
    openPage: ...
    test: ...
}

However, it might be more suitable to utilize modules, which can be found in tools such as Browserify or RequireJS.

Answer 4

It seems like AdminConsole is being generated by a function call. In case this function does not include a return statement, then AdminConsole will end up being undefined. Maybe what you are looking for is:

AdminConsole = {
    openPage: ...
    test: ...
}

However, it might be more suitable to utilize modules, which can be found in tools such as Browserify or RequireJS.

Answer 5

Answer №3

The code snippet provided showcases the concept of AdminConsole being a self-executing, anonymous function. Essentially, it is evaluated as whatever is returned by (function () {/* your code*/})(). In this scenario, since no value is returned (only functions are contained within the anonymous function), AdminConsole ends up being undefined. These functions are considered private and inaccessible from outside the anonymous function's scope.

function myPrivateData () {
    this.data = "public";
    var nobodyCanSee = "private";
}
var test = new myPrivateData();
// test.data => "public"
// test.nobodyCanSee => undefined

This situation mirrors that in your code. The inner functions of AdminConsole are not linked to the anonymous function, making them invisible externally. If you wish to interact with these functions, transforming AdminConsole into an object can aid in accessibility:

var adminConsole = {
    openPage: function () {
        // etc
    },
    test: function () {
        // etc
    }
}

By organizing your structure in this manner, you can execute the test function using adminConsole.test().

Answer 6

The code snippet provided showcases the concept of AdminConsole being a self-executing, anonymous function. Essentially, it is evaluated as whatever is returned by (function () {/* your code*/})(). In this scenario, since no value is returned (only functions are contained within the anonymous function), AdminConsole ends up being undefined. These functions are considered private and inaccessible from outside the anonymous function's scope.

function myPrivateData () {
    this.data = "public";
    var nobodyCanSee = "private";
}
var test = new myPrivateData();
// test.data => "public"
// test.nobodyCanSee => undefined

This situation mirrors that in your code. The inner functions of AdminConsole are not linked to the anonymous function, making them invisible externally. If you wish to interact with these functions, transforming AdminConsole into an object can aid in accessibility:

var adminConsole = {
    openPage: function () {
        // etc
    },
    test: function () {
        // etc
    }
}

By organizing your structure in this manner, you can execute the test function using adminConsole.test().

Invoke a JavaScript function from a dynamically inserted nested function

Answer №1

Answer №2

Answer №3

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