Fundamentals of object property in jQuery and Javascript

Currently working on creating a new property named startPosition and setting the top property to equal the button's current top value in CSS.

Below is the jQuery code snippet:

var morphObject = {

    button: $('button.morphButton'),
    container: $('div.morphContainer'),
    overlay: $('div.overlay'),
    content: $('h1.content, p.content'),

    startPosition: {
        top: morphObject.button.css('top')
        // top: 150,
        // left: '20%',
        // width: 200,
        // height: 70,
        // marginLeft: -100
    },

This is the point at which the error occurs. The issue is:

[Error] TypeError: undefined is not an object (evaluating 'morphObject.button')

Any advice on how to properly execute this task? Thanks.

javascriptjquerycss

Answer №1

morphObject is not available at the time you call morphObject.button.

To solve this issue, consider moving it outside:

var morphObject = {
    button: $('button.morphButton'),
    container: $('div.morphContainer'),
    overlay: $('div.overlay'),
    content: $('h1.content, p.content'),

    startPosition: { }
};

morphObject.startPosition.top = morphObject.button.css('top');

Alternatively, you can directly reference the jQuery element like this:

var morphObject = {
    button: $('button.morphButton'),
    container: $('div.morphContainer'),
    overlay: $('div.overlay'),
    content: $('h1.content, p.content'),

    startPosition: {
        top: $('button.morphButton').css('top')
    }
};

Answer №2

When attempting to utilize it at the moment (for assigning to top), morphObject is not yet fully assembled. It is advisable to define the object entirely first and then add additional properties that rely on already existing property values.

For example:

let 

morphObject = {
    button: $('button.morphButton'),
    container: $('div.morphContainer'),
    overlay: $('div.overlay'),
    content: $('h1.content, p.content'),
    ...
};

morphObject.startPosition: {
    top: morphObject.button.css('top')
    ...
};

Answer №3

Understanding objects in JavaScript is like drawing parallels with real-life objects. Objects in JavaScript are independent entities, each possessing its own set of properties and type.

Think of a cup as an example. A cup, just like a JavaScript object, has various properties such as color, design, weight, material, etc. These properties define the unique characteristics of the cup, similar to how properties define JavaScript objects.

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