Confused within the realm of javascript's scope

Question

Confused within the realm of javascript's scope

Hello, I'm looking for some assistance with the code snippet provided below. My goal is to call the function doTheSlide() from within the slide event function in JavaScript. However, I seem to be struggling with understanding scope in JS.

Could someone guide me on the correct way to achieve this? Currently, I am encountering an error message:

Uncaught TypeError: object is not a function

(function($) {

    bindEvent = function(slider) {

        slider.bind('slide', function(event, ui) {

            doTheSlide(ui.value);
        });
    }

    doTheSlide = function(value) {
        //Animate the slide
    }

})(jQuery);

javascript event-handling scope

Answer 1

Answer №1

To correctly utilize the 'doTheSlide' function, ensure that it is declared within your code. Avoid using it as a global function since this practice is often incorrect. Proper declaration is essential, either by using 'var' or defining a named function.

Below is an amended version of your code with my preferred structure:

(function($) {
    function doTheSlide(value) {
        //Implement slide animation
    }

    function bindEvent(slider) {
        slider.bind('slide', function(event, ui) {
            doTheSlide(ui.value);
        });
    }
})(jQuery);

Remember to declare functions prior to their usage. While calling a function declared later may work, it is not considered good coding style.

You can also opt for the following syntax:

(function($) {
    var doTheSlide = function(value) {
        //Implement slide animation
    };

    var bindEvent = function(slider) {
        slider.bind('slide', function(event, ui) {
            doTheSlide(ui.value);
        });
    };
})(jQuery);

Answer 2

To correctly utilize the 'doTheSlide' function, ensure that it is declared within your code. Avoid using it as a global function since this practice is often incorrect. Proper declaration is essential, either by using 'var' or defining a named function.

Below is an amended version of your code with my preferred structure:

(function($) {
    function doTheSlide(value) {
        //Implement slide animation
    }

    function bindEvent(slider) {
        slider.bind('slide', function(event, ui) {
            doTheSlide(ui.value);
        });
    }
})(jQuery);

Remember to declare functions prior to their usage. While calling a function declared later may work, it is not considered good coding style.

You can also opt for the following syntax:

(function($) {
    var doTheSlide = function(value) {
        //Implement slide animation
    };

    var bindEvent = function(slider) {
        slider.bind('slide', function(event, ui) {
            doTheSlide(ui.value);
        });
    };
})(jQuery);

Confused within the realm of javascript's scope

Answer №1

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